1
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Zhao T, Liu X, Nepal D, Park K, Vaia R, Nealey P, Knappenberger KL. Resolving plasmon-mediated high-order multiphoton excitation pathways in dolmen nanostructures using ultrafast nonlinear optical interferometry. J Chem Phys 2024; 161:054707. [PMID: 39092948 DOI: 10.1063/5.0218363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Accepted: 07/15/2024] [Indexed: 08/04/2024] Open
Abstract
The multiphoton excitation pathways of plasmonic nanorod assemblies are described. By using dolmen structures formed from the directed assembly of three gold nanorods, plasmon-mediated three-photon excitation is resolved. These high-order multiphoton excitation channels were accessed by resonantly exciting a hybrid mode of the dolmen structure that was resonant with the 800-nm carrier wavelength of an ultrafast laser system. Rotation of the exciting field polarization to a non-resonant configuration did not generate third-order responses. Hence, the multiphoton excitation and resultant non-equilibrium electron distributions were generated by structure- and mode-selective excitation. Correlation between high-order and resonant plasmon excitation was achieved through sub-cycle time-resolved interferometric detection of incoherent nonlinear emission signals. The results illustrate the advantages of nonlinear optical interferometry and Fourier analysis for distinguishing plasmon-mediated processes from those that do not require plasmon excitation.
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Affiliation(s)
- Tian Zhao
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Xiaoying Liu
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA
| | - Dhriti Nepal
- Air Force Research Laboratory, 2491 Hobson Way, Wright Patterson Air Force Base, Dayton, Ohio 45433, USA
| | - Kyoungyeon Park
- Air Force Research Laboratory, 2491 Hobson Way, Wright Patterson Air Force Base, Dayton, Ohio 45433, USA
| | - Richard Vaia
- Air Force Research Laboratory, 2491 Hobson Way, Wright Patterson Air Force Base, Dayton, Ohio 45433, USA
| | - Paul Nealey
- Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA
| | - Kenneth L Knappenberger
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, USA
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2
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Rambadey OV, Kumar K, Nain R, Kumar A, Sagdeo PR, Chamberlin PM, Adu KW. Shedding light on evolution of Raman line shape with probing laser power: Light-induced perturbation in electron-phonon coupling. J Chem Phys 2024; 161:034202. [PMID: 39007380 DOI: 10.1063/5.0189327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 06/26/2024] [Indexed: 07/16/2024] Open
Abstract
The laser power mediated changes in the Raman line shape have been considered in terms of interference between discrete phonon states ρ and the electronic continuum states ϰ contributed by Urbach tail states. The laser-induced effects are treated in terms of the increase in the surface temperature and thereby the scaling of electronic disorder, i.e., Urbach energy, which can further contribute to the electron-phonon interactions. Therefore, the visualization of this effect is attempted analytically as a perturbation term in the Hamiltonian, which clearly accounts for the observed changes with laser power. This has been investigated based on the experimental results of laser power dependent Raman spectra of bulk EuFeO3 and silicon nanowires, which are found to provide convincing interpretations.
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Affiliation(s)
- Omkar V Rambadey
- Materials Research Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, Khandwa Road, Indore 453552, India
| | - Kailash Kumar
- Materials Research Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, Khandwa Road, Indore 453552, India
| | - Ritu Nain
- Materials Research Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, Khandwa Road, Indore 453552, India
| | - Anil Kumar
- Materials Research Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, Khandwa Road, Indore 453552, India
- Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Pankaj R Sagdeo
- Materials Research Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, Khandwa Road, Indore 453552, India
| | - Philip M Chamberlin
- Department of Mathematics, The Pennsylvania State University-Altoona College, Altoona, Pennsylvania 16601, USA
| | - Kofi W Adu
- Department of Physics, The Pennsylvania State University-Altoona College, Altoona, Pennsylvania 16601, USA
- Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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3
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Nitharwal RK, Kumar V, Sahoo A, Rao MSR, Dixit T, Krishnan S. Manifestation of anharmonicities in terms of Fano scattering and phonon lifetime of scissors modes in α-MoO 3. Phys Chem Chem Phys 2024; 26:17892-17901. [PMID: 38887960 DOI: 10.1039/d4cp01627k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
α-MoO3 exhibits promising potential in the field of infrared detection and thermoelectricity owing to its exceptional characteristics of ultra-low-loss phonon polaritons (PhPs). It is of utmost importance to comprehend the phonon interaction exhibited by α-MoO3 in order to facilitate the advancement of phonon-centric devices. The intriguing applications of α-MoO3 for phonon-centric technology are found to be strongly dependent on scissors Raman modes. In this study, we have investigated the temperature-dependent asymmetric Raman line-shape characteristics of two scissors modes, Ag(1) and B1g(1), in the orthorhombic phase of bulk α-MoO3 within a temperature range spanning from 138 K to 498 K at 633 nm excitation wavelength. The Fano-Raman line-shape function was employed to analyze the asymmetry in terms of electron-phonon coupling strength, which varies from 0.050 to 0.313 and -0.017 to -0.192 for Ag(1) and B1g(1) modes, respectively, with temperature. This asymmetric behavior of Ag(1) and B1g(1) scissors modes are attributed to interference between the electronic energy continuum and discrete TO and LO phonon states, respectively. Therefore, the line-shape asymmetry in two scissors modes with increasing temperature stemming from the Fano resonance is also consistent with a 488 nm excitation wavelength. Additionally, anharmonicity caused by temperature results in redshift, and linewidth broadening of these two scissors modes through cubic-phonon decay has been observed. Moreover, the ultrashort lifetime of these optical phonons diminishes from ∼1.37 ps to ∼0.53 ps with increasing temperature due to the dominance of cubic-phonon decay over quartic-phonon decay. Our findings strongly emphasize the significance of investigating anharmonic interactions with Fano resonance to acquire an extensive comprehension of the vibrational characteristics of α-MoO3 for novel functionalities.
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Affiliation(s)
| | - Vivek Kumar
- Department of Physics, Indian Institute of Information Technology Design and Manufacturing Kancheepuram, Chennai, 600127, India
| | - Anubhab Sahoo
- Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India.
| | - M S Ramachandra Rao
- Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India.
- Quantum Center of Excellence for Diamond and Emergent Materials (QuCenDiEM) group, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Tejendra Dixit
- Optoelectronics and Quantum Device Group, Department of Electronics and Communication Engineering, Indian Institute of Information Technology Design and Manufacturing Kancheepuram, Chennai, 600127, India.
| | - Sivarama Krishnan
- Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India.
- Quantum Center of Excellence for Diamond and Emergent Materials (QuCenDiEM) group, Indian Institute of Technology Madras, Chennai, 600036, India
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4
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Białek R, Vasileiadis T, Pochylski M, Graczykowski B. Fano meets Stokes: Four-order-of-magnitude enhancement of asymmetric Brillouin light scattering spectra. PHOTOACOUSTICS 2023; 30:100478. [PMID: 37025113 PMCID: PMC10070932 DOI: 10.1016/j.pacs.2023.100478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 03/21/2023] [Accepted: 03/21/2023] [Indexed: 06/19/2023]
Abstract
Observation of Fano resonances in various physical phenomena is usually ascribed to the coupling of discrete states with background continuum, as it has already been reported for various physical phenomena. Here, we report on Fano lineshapes of nonthermal GHz phonons generated and observed with pumped Brillouin light scattering in gold-silicon thin membranes, overlapping the broad zero-shift background of yet questionable origin. The system's broken mid-plane symmetry enabled the generation of coherent quasi-symmetric and quasi-antisymmetric Lamb acoustic waves/phonons, leading to the four orders-of-magnitude enhancement of Brillouin light scattering. Notably, the membrane asymmetry resulted also in the mode-dependent Stokes and anti-Stokes Fano lineshapes asymmetry.
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Affiliation(s)
- Rafał Białek
- Faculty of Physics, Adam Mickiewicz University, Poznań, ul. Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland
| | - Thomas Vasileiadis
- Faculty of Physics, Adam Mickiewicz University, Poznań, ul. Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland
| | - Mikołaj Pochylski
- Faculty of Physics, Adam Mickiewicz University, Poznań, ul. Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland
| | - Bartłomiej Graczykowski
- Faculty of Physics, Adam Mickiewicz University, Poznań, ul. Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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5
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Rani C, Kandpal S, Ghosh T, Bansal L, Tanwar M, Kumar R. Energy dispersive anti-anharmonic effect in a Fano intervened semiconductor: revealed through temperature and wavelength-dependent Raman scattering. Phys Chem Chem Phys 2023; 25:1627-1631. [PMID: 36601877 DOI: 10.1039/d2cp04686e] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
It is always interesting to understand how the interplay between two perturbations, affects any physical process and gets manifested in a semiconductor. Temperature- and wavelength-dependent Raman Spectromicroscopy was performed on heavily-doped Si to reveal an unusual anti-anharmonic effect. Additionally, the energy dispersive behaviour of Fano coupling strength was also studied and its possible interrelation with the observed anti-anharmonic effect was explored. A systematic study revealed that at the different excitation wavelengths, the strength of the Fano interaction was different, where the involved electron-phonon (Fano-Fano-interferon) bound states were counted together with different energies. By understanding how the interplay manifests in terms of the Raman line shape, a method to calculate the Fano-interferon dissociation energy was developed. The slope of the Raman linewidth at different excitation wavelengths with temperature showed a negative temperature coefficient and sign reversal on decreasing the doping concentration. A wavelength-dependent empirical relation is proposed to calculate the required thermal energy, required to dissociate the electron-phonon bound state.
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Affiliation(s)
- Chanchal Rani
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol-453552, India.
| | - Suchita Kandpal
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol-453552, India.
| | - Tanushree Ghosh
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol-453552, India.
| | - Love Bansal
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol-453552, India.
| | - Manushree Tanwar
- Department of Chemistry, University of Pennsylvania, 231S, 34 Street, Philadelphia, PA 19104-6323, USA.
| | - Rajesh Kumar
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol-453552, India.
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6
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Pan F, Karlsson K, Nixon AG, Hogan LT, Ward JM, Smith KC, Masiello DJ, Nic Chormaic S, Goldsmith RH. Active Control of Plasmonic-Photonic Interactions in a Microbubble Cavity. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2022; 126:20470-20479. [PMID: 36620077 PMCID: PMC9814823 DOI: 10.1021/acs.jpcc.2c05733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 11/07/2022] [Indexed: 06/17/2023]
Abstract
Active control of light-matter interactions using nanophotonic structures is critical for new modalities for solar energy production, cavity quantum electrodynamics (QED), and sensing, particularly at the single-particle level, where it underpins the creation of tunable nanophotonic networks. Coupled plasmonic-photonic systems show great promise toward these goals because of their subwavelength spatial confinement and ultrahigh-quality factors inherited from their respective components. Here, we present a microfluidic approach using microbubble whispering-gallery mode cavities to actively control plasmonic-photonic interactions at the single-particle level. By changing the solvent in the interior of the microbubble, control can be exerted on the interior dielectric constant and, thus, on the spatial overlap between the photonic and plasmonic modes. Qualitative agreement between experiment and simulation reveals the competing roles mode overlap and mode volume play in altering coupling strengths.
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Affiliation(s)
- Feng Pan
- Department
of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin53706, United States
| | - Kristoffer Karlsson
- Light-Matter
Interactions for Quantum Technologies Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa904-0495, Japan
| | - Austin G. Nixon
- Department
of Chemistry, University of Washington, Seattle, Washington98195, United States
| | - Levi T. Hogan
- Department
of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin53706, United States
| | - Jonathan M. Ward
- Department
of Physics, University College Cork, CorkVGV5+95, Ireland
| | - Kevin C. Smith
- Department
of Physics, Yale University, New Haven, Connecticut06511, United States
| | - David J. Masiello
- Department
of Chemistry, University of Washington, Seattle, Washington98195, United States
| | - Síle Nic Chormaic
- Light-Matter
Interactions for Quantum Technologies Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa904-0495, Japan
| | - Randall H. Goldsmith
- Department
of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin53706, United States
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7
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Oliveira AP, Jalbert G, Rocha AB. Fano–Feshbach formalism applied to the calculation of autoionization widths through analytic continuation. J Chem Phys 2022; 156:244116. [DOI: 10.1063/5.0094855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A method to calculate the autoionization width from a discretized pseudo-spectrum is proposed. This method relies on an analytic continuation of Green’s function within the Fano–Feshbach formalism. The pseudo-spectrum is obtained at the multireference configuration interaction level in a square-integrable basis set, commonly found in quantum chemistry software. Few states around the desired resonance are needed to perform the analytic continuation. This method was applied to atomic (He and Ne) and molecular (HF and benzene) systems, and the results for the autoionization width show good agreement with the available theoretical and experimental values.
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Affiliation(s)
- A. P. Oliveira
- Universidade Federal do Rio de Janeiro, UFRJ, Instituto de Química, Av. Athos da Silveira Ramos, 149, Rio de Janeiro - RJ 21941-909, Brazil
- Universidade Federal do Rio de Janeiro, UFRJ, Instituto de Física, Av. Athos da Silveira Ramos, 149, Rio de Janeiro - RJ 21941-909, Brazil
| | - Ginette Jalbert
- Universidade Federal do Rio de Janeiro, UFRJ, Instituto de Física, Av. Athos da Silveira Ramos, 149, Rio de Janeiro - RJ 21941-909, Brazil
| | - A. B. Rocha
- Universidade Federal do Rio de Janeiro, UFRJ, Instituto de Química, Av. Athos da Silveira Ramos, 149, Rio de Janeiro - RJ 21941-909, Brazil
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8
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Rani C, Tanwar M, Kandpal S, Ghosh T, Bansal L, Kumar R. Nonlinear Temperature-Dependent Phonon Decay in Heavily Doped Silicon: Predominant Interferon-Mediated Cold Phonon Annihilation. J Phys Chem Lett 2022; 13:5232-5239. [PMID: 35670640 DOI: 10.1021/acs.jpclett.2c01248] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A nonlinear Fano interaction has been reported here which is manifest in terms of a parabolic temperature-dependent phonon decay process observable in terms of a Raman spectral parameter. Temperature-dependent Raman spectroscopic studies have been carried out on heavily and moderately doped crystalline silicon to investigate the behavior of anharmonic phonon decay in semiconductor systems where Fano interactions are present inherently. Systematic study reveals that in heavily doped systems an interferon-mediated decay route exists for cold phonons present at lower temperatures (<475 K) where Fano coupling is stronger and dominates over the typical multiple-phonon decay process. On the other hand, the anharmonic phonon decay remains the predominant process at higher temperatures irrespective of the doping level. Temperature-dependent phonon self-energy has been calculated using experimentally observed Raman line-shape parameters to validate the fact that the nonlinear decay of phonons through interferon mediation is a thermodynamically favorable process at low temperatures.
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Affiliation(s)
- Chanchal Rani
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol 453552, India
| | - Manushree Tanwar
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol 453552, India
| | - Suchita Kandpal
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol 453552, India
| | - Tanushree Ghosh
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol 453552, India
| | - Love Bansal
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol 453552, India
| | - Rajesh Kumar
- Materials and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol 453552, India
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9
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Tanwar M, Bansal L, Rani C, Rani S, Kandpal S, Ghosh T, Pathak DK, Sameera I, Bhatia R, Kumar R. Fano-Type Wavelength-Dependent Asymmetric Raman Line Shapes from MoS 2 Nanoflakes. ACS PHYSICAL CHEMISTRY AU 2022; 2:417-422. [PMID: 36855687 PMCID: PMC9955271 DOI: 10.1021/acsphyschemau.2c00021] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Excitation wavelength-dependent Raman spectroscopy has been carried out to study electron-phonon interaction (Fano resonance) in multi-layered bulk 2H-MoS2 nano-flakes. The electron-phonon coupling is proposed to be caused due to interaction between energy of an excitonic quasi-electronic continuum and the discrete one phonon, first-order Raman modes of MoS2. It is proposed that an asymmetrically broadened Raman line shape obtained by 633 nm laser excitation is due to electron-phonon interaction whose electronic continuum is provided by the well-known A and B excitons. Typical wavelength-dependent Raman line shape has been observed, which validates and quantifies the Fano interaction present in the samples. The experimentally obtained Raman scattering data show very good agreement with the theoretical Fano-Raman line-shape functions and help in estimating the coupling strength. Values of the electron-phonon interaction parameter obtained, through line-shape fitting, for the two excitation wavelengths have been compared and shown to have generic Fano-type dependence on the excitation wavelength.
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Affiliation(s)
- Manushree Tanwar
- Materials
and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, Indore 453552, India
| | - Love Bansal
- Materials
and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, Indore 453552, India
| | - Chanchal Rani
- Materials
and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, Indore 453552, India
| | - Sonam Rani
- Department
of Physics, Guru Jambheshwar University
of Science & Technology, Hisar 125001, India
| | - Suchita Kandpal
- Materials
and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, Indore 453552, India
| | - Tanushree Ghosh
- Materials
and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, Indore 453552, India
| | - Devesh K. Pathak
- Materials
and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, Indore 453552, India
| | - I. Sameera
- Department
of Physics, Guru Jambheshwar University
of Science & Technology, Hisar 125001, India
| | - Ravi Bhatia
- Department
of Physics, Guru Jambheshwar University
of Science & Technology, Hisar 125001, India
| | - Rajesh Kumar
- Materials
and Device Laboratory, Department of Physics, Indian Institute of Technology Indore, Simrol, Indore 453552, India,Centre
for Indian Scientific Knowledge Systems, Indian Institute of Technology Indore, Simrol, Indore 453552, India,Centre
for Advanced Electronics, Indian Institute
of Technology Indore, Simrol, Indore 453552, India,
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10
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Shang J, Wu L, Feng S, Chen Y, Zhang H, Cong C, Huang W, Yu T. White-Light-Driven Resonant Emission from a Monolayer Semiconductor. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2103527. [PMID: 35129854 DOI: 10.1002/adma.202103527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 01/19/2022] [Indexed: 06/14/2023]
Abstract
Resonant emission in photonic structures is very useful to construct all-photonic circuits for optical interconnects and quantum computing. Optical generation of most resonant-emitting modes in photonic structures is obtained by coherent pumping rather than incoherent illumination. Particularly, the development of white-light- or even solar-powered on-chip light sources remains challenging but is very attractive in view of the much facile availability of these incoherent excitation sources. Here, net resonant emission from a monolayer semiconductor is demonstrated under simulated solar illumination by a white-light-emitting diode. The device is formed by embedding a 2D gain medium into a planar microcavity on a silicon wafer, which is compatible with the prevailing on-chip photonic technology. Coherent and white-light excitation sources are, respectively, selected for optical pumping, where the output light in two cases exhibits well-consistent resonant wavelength, linewidth, polarization, location, and Gaussian-beam profile. The fundamental TEM00 mode behaves as a doublet emission, resulting from anisotropy-induced non-degenerate states with orthogonal polarizations. The extraordinary spectral flipping is attributed to the competitive interplay of resonant absorption and emission. This work paves a way toward white-light or solar-powered state-of-the-art photonic applications at the chip scale.
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Affiliation(s)
- Jingzhi Shang
- Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), Xi'an, 710129, China
| | - Lishu Wu
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Shun Feng
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Yu Chen
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Hongbo Zhang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Chunxiao Cong
- State Key Laboratory of ASIC and System, School of Information Science and Technology, Fudan University, Shanghai, 200433, China
| | - Wei Huang
- Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), Xi'an, 710129, China
- Key Laboratory of Flexible Electronics and Institute of Advanced Materials, National Jiangsu Synergetic Innovation Centre for Advanced Materials, Nanjing Tech University, Nanjing, 211816, China
| | - Ting Yu
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
- School of Physics and Technology, Wuhan University, Wuhan, 430072, China
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11
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Gong Y, Cao Z, Zhang Z, Liu R, Zhang F, Wei J, Yang Z. Chirality Inversion in Self-Assembled Nanocomposites Directed by Curvature-Mediated Interactions. Angew Chem Int Ed Engl 2022; 61:e202117406. [PMID: 34981650 DOI: 10.1002/anie.202117406] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Indexed: 11/05/2022]
Abstract
Nanoscale curvature-dependent interactions are of paramount importance in biological systems. Here, we report that nanoscale curvature plays an important role in regulating the chirality of self-assembled nanocomposites from chiral organic molecules and achiral nanoparticles. Specifically, we show that the supramolecular chirality of the nanocomposites markedly depends on the nanoparticle curvature, where small-sized nanoparticles of high curvature and large-sized nanoparticles of low curvature lead to nanocomposites with opposite chirality. Quantitative kinetic experiments and molecular dynamics simulations reveal that nanoparticle curvature plays a key role in promoting the pre-nucleation oligomerization of chiral molecules, which consequently regulates the supramolecular chirality of the nanocomposites. We anticipate that this study will aid in rational design of an artificial cooperative system giving rise to emergent assembling phenomena that can be surprisingly rich and often cannot be understood by studying the conventional noncooperative systems.
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Affiliation(s)
- Yanjun Gong
- School of Chemistry and Chemical Engineering, Key Laboratory of Colloid and Interface Chemistry of MOE, Shandong University, Jinan, 250100, P. R. China
| | - Zhaozhen Cao
- School of Chemistry and Chemical Engineering, Key Laboratory of Colloid and Interface Chemistry of MOE, Shandong University, Jinan, 250100, P. R. China
| | - Zongze Zhang
- School of Chemistry and Chemical Engineering, Key Laboratory of Colloid and Interface Chemistry of MOE, Shandong University, Jinan, 250100, P. R. China
| | - Rongjuan Liu
- School of Chemistry and Chemical Engineering, Key Laboratory of Colloid and Interface Chemistry of MOE, Shandong University, Jinan, 250100, P. R. China
| | - Fenghua Zhang
- School of Chemistry and Chemical Engineering, Key Laboratory of Colloid and Interface Chemistry of MOE, Shandong University, Jinan, 250100, P. R. China
| | - Jingjing Wei
- School of Chemistry and Chemical Engineering, Key Laboratory of Colloid and Interface Chemistry of MOE, Shandong University, Jinan, 250100, P. R. China
| | - Zhijie Yang
- School of Chemistry and Chemical Engineering, Key Laboratory of Colloid and Interface Chemistry of MOE, Shandong University, Jinan, 250100, P. R. China
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12
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Gong Y, Cao Z, Zhang Z, Liu R, Zhang F, Wei J, Yang Z. Chirality Inversion in Self‐Assembled Nanocomposites Directed by Curvature‐Mediated Interactions. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202117406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yanjun Gong
- School of Chemistry and Chemical Engineering Key Laboratory of Colloid and Interface Chemistry of MOE Shandong University Jinan 250100 P. R. China
| | - Zhaozhen Cao
- School of Chemistry and Chemical Engineering Key Laboratory of Colloid and Interface Chemistry of MOE Shandong University Jinan 250100 P. R. China
| | - Zongze Zhang
- School of Chemistry and Chemical Engineering Key Laboratory of Colloid and Interface Chemistry of MOE Shandong University Jinan 250100 P. R. China
| | - Rongjuan Liu
- School of Chemistry and Chemical Engineering Key Laboratory of Colloid and Interface Chemistry of MOE Shandong University Jinan 250100 P. R. China
| | - Fenghua Zhang
- School of Chemistry and Chemical Engineering Key Laboratory of Colloid and Interface Chemistry of MOE Shandong University Jinan 250100 P. R. China
| | - Jingjing Wei
- School of Chemistry and Chemical Engineering Key Laboratory of Colloid and Interface Chemistry of MOE Shandong University Jinan 250100 P. R. China
| | - Zhijie Yang
- School of Chemistry and Chemical Engineering Key Laboratory of Colloid and Interface Chemistry of MOE Shandong University Jinan 250100 P. R. China
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13
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Gao J, Liu H, Zhang M, Liu M, Zhang H, Zhang Y. Dynamic switching between bound states in the continuum (BIC) and quasi-BIC based on a Dirac semimetal terahertz metasurface. Phys Chem Chem Phys 2022; 24:25571-25579. [DOI: 10.1039/d2cp03248a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
This work presents a Dirac semimetal–metal metasurface for the dynamic switching of terahertz-band BIC to quasi-BIC. The display of clear letters is achieved by arranging the metasurface array and applying different voltages.
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Affiliation(s)
- Jingxiang Gao
- College of Electronics and Information Engineering, Shandong University of Science and Technology, Qingdao, 266510, China
| | - Hang Liu
- College of Electronics and Information Engineering, Shandong University of Science and Technology, Qingdao, 266510, China
| | - Man Zhang
- Key Laboratory of Micro Nano Optoelectronic Devices and Intelligent Perception Systems, School of Electronic Information Engineering, Yangtze Normal University, Chongqing, 408100, China
| | - Meng Liu
- College of Electronics and Information Engineering, Shandong University of Science and Technology, Qingdao, 266510, China
| | - Huiyun Zhang
- College of Electronics and Information Engineering, Shandong University of Science and Technology, Qingdao, 266510, China
| | - Yuping Zhang
- College of Electronics and Information Engineering, Shandong University of Science and Technology, Qingdao, 266510, China
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14
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Sun J, Ding Z, Yu Y, Liang W. Nonlinear features of Fano resonance: a QM/EM study. Phys Chem Chem Phys 2021; 23:15994-16004. [PMID: 34318831 DOI: 10.1039/d1cp02459k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The nonlinear Fano effects on the absorption of hybrid systems composed of a silver nanosphere and an indoline dye molecule have been systematically investigated by the hybrid approach, which combines the quantum mechanics method (QM) with the computational electromagnetic method (EM). The absorption spectra of the dye molecule in the proximity of an Ag nanoparticle have been calculated by changing the incident field intensity, the phenomenological dephasing of molecular excitation, and the enhancement ratio of the near field. The contribution of molecular nonlinear response properties and the quantum interferences of the incident and scattered fields and of resonant plasmon-molecular excitations to the spectra has been identified. It is in no doubt that Fano resonance due to the plasmon-molecular interaction can appear in both the weak and strong field regimes; however, the Fano effect is more pronounced in the strong field regime where quantum interference leads to a nonlinear Fano effect controlled by a complex field-dependent Fano factor. When the incident field is strong enough, the resonance antisymmetry structure is spectrally resolved, and it changes with the change of the field intensity. As the field intensity varies from weak to strong, the Fano lineshape's asymmetry increases with increasing intensity in the beginning, and then decreases with a further increase of the field intensity attributed to the increase of the detuning energy induced by the integrated energy shift upon field dressing during the excitation. Decreasing the enhancement ratio of the near field or the dephasing of molecular excitation can also control the spectral lineshape transformation from an asymmetric profile to a symmetric Lorentzian lineshape. These findings are consistent with previous experimental and theoretical observations arisen by quantum interferences and are expected to stimulate further work toward exploring the plasmon-molecular interplay and the applications of Fano resonance in optical switching and sensing.
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Affiliation(s)
- Jin Sun
- School of Physics and Optoelectronics Engineering, Energy Materials and Devices Key Lab of Anhui Province for Photoelectric Conversion, Anhui University, Hefei 230601, People's Republic of China
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15
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Tanwar M, Pathak DK, Chaudhary A, Krylov AS, Pfnür H, Sharma A, Ahn B, Lee S, Kumar R. Pseudo-Anomalous Size-Dependent Electron-Phonon Interaction in Graded Energy Band: Solving the Fano Paradox. J Phys Chem Lett 2021; 12:2044-2051. [PMID: 33606540 DOI: 10.1021/acs.jpclett.1c00217] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Quantum size effects on interferons (electron-phonon bound states), confined in fractal silicon (Si) nanostructures (NSs), have been studied by using Raman spectromicroscopy. A paradoxical size dependence of Fano parameters, estimated from Raman spectra, has been observed as a consequence of longitudinal variation of nanocrystallite size along the Si wires leading to local variations in the dopants' density which actually starts governing the Fano coupling, thus liberating the interferons to exhibit the typical quantum size effect. These interferons are more dominated by the effective reduction in dopants' density rather than the quantum confinement effect. Detailed experimental and theoretical Raman line shape analyses have been performed to solve the paradox by establishing that the increasing size effect actually is accompanied by receding Fano coupling due to the weakened electronic continuum. The latter has been validated by observing a consequent variation in the Raman signal from dopants which was found to be consistent with the above conclusion.
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Affiliation(s)
- Manushree Tanwar
- Materials and Device Laboratory, Discipline of Physics, Indian Institute of Technology Indore, Simrol 453552, India
| | - Devesh K Pathak
- Materials and Device Laboratory, Discipline of Physics, Indian Institute of Technology Indore, Simrol 453552, India
| | - Anjali Chaudhary
- Materials and Device Laboratory, Discipline of Physics, Indian Institute of Technology Indore, Simrol 453552, India
| | - Alexander S Krylov
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS Krasnoyarsk 660036, Russia
| | - Herbert Pfnür
- Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany
| | - Ashutosh Sharma
- Department of Materials Science and Engineering, Ajou University, Suwon 16499, Korea
| | - Byungmin Ahn
- Department of Materials Science and Engineering, Ajou University, Suwon 16499, Korea
- Department of Energy Systems Research, Ajou University, Suwon 16499, Korea
| | - Sangyeob Lee
- Department of Materials Science and Engineering, Hanbat National University, Daejeon 34158, Korea
| | - Rajesh Kumar
- Materials and Device Laboratory, Discipline of Physics, Indian Institute of Technology Indore, Simrol 453552, India
- Centre for Advanced Electronics, Indian Institute of Technology Indore, Simrol 453552, India
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16
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Litvinenko KL, Le NH, Redlich B, Pidgeon CR, Abrosimov NV, Andreev Y, Huang Z, Murdin BN. The multi-photon induced Fano effect. Nat Commun 2021; 12:454. [PMID: 33469024 PMCID: PMC7815926 DOI: 10.1038/s41467-020-20534-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Accepted: 10/21/2020] [Indexed: 12/04/2022] Open
Abstract
The ordinary Fano effect occurs in many-electron atoms and requires an autoionizing state. With such a state, photo-ionization may proceed via pathways that interfere, and the characteristic asymmetric resonance structures appear in the continuum. Here we demonstrate that Fano structure may also be induced without need of auto-ionization, by dressing the continuum with an ordinary bound state in any atom by a coupling laser. Using multi-photon processes gives complete, ultra-fast control over the interference. We show that a line-shape index q near unity (maximum asymmetry) may be produced in hydrogenic silicon donors with a relatively weak beam. Since the Fano lineshape has both constructive and destructive interference, the laser control opens the possibility of state-selective detection with enhancement on one side of resonance and invisibility on the other. We discuss a variety of atomic and molecular spectroscopies, and in the case of silicon donors we provide a calculation for a qubit readout application. Fano resonances occur in many platforms that have auto-ionizing states. Here the authors show that auto-ionizing states are not required for multi-photon Fano resonance in a Si:P system with significant screening by using a pump-probe method.
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Affiliation(s)
- K L Litvinenko
- Department of Physics, Advanced Technology Institute, University of Surrey, Guildford, GU2 7XH, UK.
| | - Nguyen H Le
- Department of Physics, Advanced Technology Institute, University of Surrey, Guildford, GU2 7XH, UK
| | - B Redlich
- FELIX Laboratory, Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands
| | - C R Pidgeon
- Institute of Photonics and Quantum Science, SUPA, Heriot-Watt University, Edinburgh, UK
| | - N V Abrosimov
- Leibniz-Institut für Kristallzüchtung (IKZ), Berlin, Germany
| | - Y Andreev
- Institute of Monitoring of Climatic and Ecological Systems of SB RAS, 10/3, Academicheskii Avenue, Tomsk, 634055, Russia.,National Research Tomsk State University, 1, Novosobornaya Strasse, Tomsk, 634050, Russia
| | - Zhiming Huang
- State Key Laboratory of Infrared Physics and Laboratory of Space Active Opto-Electronics Technology, Shanghai Institute of Technical Physics, CAS, 500 Yutian Road, Shanghai, 200083, China
| | - B N Murdin
- Department of Physics, Advanced Technology Institute, University of Surrey, Guildford, GU2 7XH, UK
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17
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Zhu S, Fan C, Liang E, Ding P, Dong X, Hao H, Hou H, Wu Y. Plasmon coupling nanorice trimer for ultrahigh enhancement of hyper-Raman scattering. Sci Rep 2021; 11:1230. [PMID: 33441612 PMCID: PMC7806829 DOI: 10.1038/s41598-020-78814-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 11/27/2020] [Indexed: 01/29/2023] Open
Abstract
A new tactic that using Ag nanorice trimer as surface-enhanced hyper Raman scattering substrate is proposed for realizing maximum signal enhancement. In this paper, we numerically simulate and theoretically analyze the optical properties of the nanorice trimer consisting of two short nanorices and a long nanorice. The Ag nanorice trimer can excite Fano resonance at optical frequencies based on the strong interaction between the bright and the dark mode. The bright mode is attributed to the first longitudinal resonance of the short nanorice pair, while the dark mode originates from the third longitudinal mode resonance of the long nanorice. The electric field distributions demonstrate that the two resonances with the largest field strength correspond to the first-order resonance of the long nanorice and the Fano resonance of the trimer, respectively. Two plasmon resonances with maximum electromagnetic field enhancements and same spatial hot spot regions can match spectrally with the pump and second-order Stokes beams of hyper Raman scattering, respectively, through reasonable design of the trimer structure parameters. The estimated enhancement factor of surface-enhanced hyper Raman scattering can achieve as high as 5.32 × 1013.
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Affiliation(s)
- Shuangmei Zhu
- grid.494634.8Henan Key Laboratory of Electronic Ceramic Materials and Application and College of Science, Henan University of Engineering, Zhengzhou, 451191 China ,grid.207374.50000 0001 2189 3846College of Chemistry, Zhengzhou University, Zhengzhou, 450001 China ,Henan Shijia Photons Technology Co., Ltd., Hebi, 458030 China
| | - Chunzhen Fan
- grid.207374.50000 0001 2189 3846School of Physics and Microelectronics and MOE Key Laboratory of Materials Physics, Zhengzhou University, Zhengzhou, 450001 China
| | - Erjun Liang
- grid.207374.50000 0001 2189 3846School of Physics and Microelectronics and MOE Key Laboratory of Materials Physics, Zhengzhou University, Zhengzhou, 450001 China
| | - Pei Ding
- grid.464501.20000 0004 1799 3504School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou, 450046 China
| | - Xiguang Dong
- grid.494634.8Henan Key Laboratory of Electronic Ceramic Materials and Application and College of Science, Henan University of Engineering, Zhengzhou, 451191 China
| | - Haoshan Hao
- grid.494634.8Henan Key Laboratory of Electronic Ceramic Materials and Application and College of Science, Henan University of Engineering, Zhengzhou, 451191 China
| | - Hongwei Hou
- grid.207374.50000 0001 2189 3846College of Chemistry, Zhengzhou University, Zhengzhou, 450001 China
| | - Yuanda Wu
- Henan Shijia Photons Technology Co., Ltd., Hebi, 458030 China
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18
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Li Y, Wang X, Wu J, Feng G, Liu W, Sovkov VB, Ma J, Deb B, Xiao L, Jia S. The effects of Feshbach resonance on spectral shifts in photoassociation of Cs atoms. Phys Chem Chem Phys 2021; 23:641-646. [PMID: 33332502 DOI: 10.1039/d0cp04840b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We study the effects of magnetic Feshbach resonance on the shifts in photoassociation (PA) spectra of ultracold Cs atoms. A series of atom loss spectra show a linear variation of the frequency shift with the PA laser intensity at different magnetic fields near the d-wave Feshbach resonance of optically trapped Cs atoms. The magnetic field-dependence of the slope of the shift on the PA laser intensity exhibits a dispersive change near the Feshbach resonance. The theoretical formula derived from a model based on Fano resonance fits well with the experimental data. Using a model rectangular potential with tunable well depth and applying the Franck-Condon principle, we obtain numerical results, which are found to be largely in disagreement with the experimental findings.
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Affiliation(s)
- Yuqing Li
- State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institude of Laser Spectroscopy, College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China.
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19
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Liu X, Kongsuwan N, Li X, Zhao D, Wu Z, Hess O, Zhang X. Tailoring the Third-Order Nonlinear Optical Property of a Hybrid Semiconductor Quantum Dot-Metal Nanoparticle: From Saturable to Fano-Enhanced Absorption. J Phys Chem Lett 2019; 10:7594-7602. [PMID: 31769991 DOI: 10.1021/acs.jpclett.9b02627] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Semiconductor-metal hybrid nanostructures present an exotic class of nonlinear optical materials due to their potential optoelectronic applications. However, most studies to date focus on their total optical responses instead of contributions from individual nonlinear orders. In this Letter, we present a theoretical study on the third-order nonlinear optical absorption of a hybrid colloidal semiconductor quantum dot (SQD)-metal nanoparticle (MNP) system. We develop a novel analytic treatment based on the nonlinear density matrix equation and derive a closed-form expression for the optical susceptibility. Our study identifies the parameter space that governs the system's optical transition from being a saturable absorber to a Fano-enhanced absorber. We attribute this transition to the plasmon-mediated self-interaction of the SQD. The findings provide a valuable guideline for optimized designs of functional nanophotonic devices based on SQD-MNP hybrid structures.
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Affiliation(s)
- Xiaona Liu
- School of Physical Science and Technology , Southwest University , Chongqing 400715 , P. R. China
- State Key Laboratory of Superlattices and Microstructures , Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083 , P. R. China
- The Blackett Laboratory , Imperial College London , Prince Consort Road , London SW7 2AZ , United Kingdom
| | - Nuttawut Kongsuwan
- The Blackett Laboratory , Imperial College London , Prince Consort Road , London SW7 2AZ , United Kingdom
| | - Xiaoguang Li
- Institute for Advanced Study , Shenzhen University , Shenzhen 518060 , P. R. China
| | - Dongxing Zhao
- School of Physical Science and Technology , Southwest University , Chongqing 400715 , P. R. China
| | - Zhengmao Wu
- School of Physical Science and Technology , Southwest University , Chongqing 400715 , P. R. China
| | - Ortwin Hess
- The Blackett Laboratory , Imperial College London , Prince Consort Road , London SW7 2AZ , United Kingdom
| | - Xinhui Zhang
- State Key Laboratory of Superlattices and Microstructures , Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083 , P. R. China
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20
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Westmoreland DE, McClelland KP, Perez KA, Schwabacher JC, Zhang Z, Weiss EA. Properties of quantum dots coupled to plasmons and optical cavities. J Chem Phys 2019; 151:210901. [DOI: 10.1063/1.5124392] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Dana E. Westmoreland
- Department of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, Illinois 60208-3113, USA
| | - Kevin P. McClelland
- Department of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, Illinois 60208-3113, USA
| | - Kaitlyn A. Perez
- Department of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, Illinois 60208-3113, USA
| | - James C. Schwabacher
- Department of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, Illinois 60208-3113, USA
| | - Zhengyi Zhang
- Department of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, Illinois 60208-3113, USA
| | - Emily A. Weiss
- Department of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, Illinois 60208-3113, USA
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21
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Silevitch DM, Tang C, Aeppli G, Rosenbaum TF. Tuning high-Q nonlinear dynamics in a disordered quantum magnet. Nat Commun 2019; 10:4001. [PMID: 31488819 PMCID: PMC6728381 DOI: 10.1038/s41467-019-11985-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Accepted: 08/13/2019] [Indexed: 11/09/2022] Open
Abstract
Quantum states cohere and interfere. Atoms arranged imperfectly in a solid rarely display these properties. Here we demonstrate an exception in a disordered quantum magnet that divides itself into nearly isolated subsystems. We probe these coherent spin clusters by driving the system nonlinearly and measuring the resulting hole in the linear spectral response. The Fano shape of the hole encodes the incoherent lifetime as well as coherent mixing of the localized excitations. For the Ising magnet LiHo0.045Y0.955F4, the quality factor Q for spectral holes can be as high as 100,000. We tune the dynamics by sweeping the Fano mixing parameter q through zero via the ac pump amplitude as well as a dc transverse field. The zero crossing of q is associated with a dissipationless response at the drive frequency. Identifying localized two-level systems in a dense and disordered magnet advances the search for qubit platforms emerging from strongly interacting, many-body systems.
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Affiliation(s)
- D M Silevitch
- Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California, 91125, USA
| | - C Tang
- Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California, 91125, USA
| | - G Aeppli
- Department of Physics, ETH Zurich, Zurich, CH-8093, Switzerland
- Department de Physique, EPF Lausanne, Lausanne, CH-1015, Switzerland
- Paul Scherrer Institut, Villigen, PSI, CH-5232, Switzerland
| | - T F Rosenbaum
- Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, California, 91125, USA.
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22
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Zhao T, Xiao H, Li Y, Yang J, Jia H, Ren G, Mitchell A, Tian Y. Independently tunable double Fano resonances based on waveguide-coupled cavities. OPTICS LETTERS 2019; 44:3154-3157. [PMID: 31199404 DOI: 10.1364/ol.44.003154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 05/26/2019] [Indexed: 06/09/2023]
Abstract
In this Letter, we first demonstrate periodically and independently tunable double Fano resonances (DFRs) using waveguide-coupled cavities consisting of two silicon microring resonators (MRRs) and a feedback-coupled waveguide. The proposed device is fabricated on the silicon-on-insulator substrate using the standard complementary metal-oxide-semiconductor fabrication process. The DFR can be tuned independently by changing the resonant wavelengths of two MRRs using the thermo-optic effect. The highest extinction ratio of the Fano resonances is measured to be as high as 29.20 dB, which enables this device to be a promising candidate for high-performance multi-wavelength optical switches and high-sensitivity biochemical sensors.
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23
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He X, Lin F, Liu F, Shi W. Tunable high Q-factor terahertz complementary graphene metamaterial. NANOTECHNOLOGY 2018; 29:485205. [PMID: 30207547 DOI: 10.1088/1361-6528/aae0d7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Based on the complementary graphene asymmetric double bars patterns, the tunable Fano resonances with large Q-factors have been investigated in the terahertz regime, including the effects of Fermi levels, structural parameters and operation frequency. The results reveal that compared with existed graphene tunable devices, the Fano resonant curve is very narrow and indicates a large Q-factor of about 60. The strong Fano resonant curves can be convenient tailored. As Fermi level increases, the amplitude of the Fano dip decreases, and the resonant peak position shifts to high frequency. The amplitude modulation depth (MD) of the Fano curve is more, about 90%, if the Fermi level changes in the scope of 0.2-1.0 eV. With the increase of the sample refractive index, the resonant Fano dip shifts low frequency, and the dip amplitude MD can reach more than 40%. The results are very helpful to understand the tunable mechanisms of graphene based Fano systems and to design high sensitivity functional devices, e.g. sensors, modulators, and antenna.
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Affiliation(s)
- Xiaoyong He
- Department of Physics, Mathematics & Science College, Shanghai Normal University, No. 100 Guilin Road, Shanghai, 200234, People's Republic of China
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24
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Pant R, A SS, Yelikar AB. Wideband excitation of Fano resonances and induced transparency by coherent interactions between Brillouin resonances. Sci Rep 2018; 8:9175. [PMID: 29907792 PMCID: PMC6003991 DOI: 10.1038/s41598-018-27444-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 05/30/2018] [Indexed: 11/17/2022] Open
Abstract
Wideband excitation and control of Fano resonance and electromagnetically induced transparency (EIT), both of which rely on coherent interaction between two excitation paths, is challenging. It requires precise control and tuning of interacting resonances or coupling between different resonant structures over a wide frequency range. Gain (Stokes) and absorption (anti-Stokes) resonances associated with the stimulated Brillouin scattering (SBS) process can be excited and controlled over a wide frequency range by tuning the pump frequency, its power and profile. We exploit coherent interaction between the Brillouin Stokes and anti-Stokes resonance, in radio frequency domain, to demonstrate Fano and EIT-like resonance over a wide frequency range and control their shape and strength optically and electrically. For the Fano resonance, the asymmetry and polarity are electrically controlled over an unprecedented frequency range (100 MHz-43 GHz) by varying the bias to the intensity modulator whereas, the strength is varied by tuning the Brillouin pump power and/or the bias. The depth and 3 dB linewidth of the transparency window in the EIT-like resonance are controlled using pump and probe parameters. The flexibility of the SBS process that allows wideband electrical and optical control of Fano and EIT-like resonance opens up the potential for applications that range from low-power switching, sensing to tunable RF delay.
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Affiliation(s)
- Ravi Pant
- Laboratory for Phoxonics and Nonlinear Optics in Nanostructures (PHONON), School of Physics, Indian Institute of Science Education and Research (IISER), Thiruvananthapuram, 695551, Kerala, India.
| | - Siva Shakthi A
- Laboratory for Phoxonics and Nonlinear Optics in Nanostructures (PHONON), School of Physics, Indian Institute of Science Education and Research (IISER), Thiruvananthapuram, 695551, Kerala, India
| | - Anjali B Yelikar
- Laboratory for Phoxonics and Nonlinear Optics in Nanostructures (PHONON), School of Physics, Indian Institute of Science Education and Research (IISER), Thiruvananthapuram, 695551, Kerala, India
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25
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Finkelstein-Shapiro D, Pullerits T, Hansen T. Two-dimensional Fano lineshapes: Excited-state absorption contributions. J Chem Phys 2018; 148:184201. [PMID: 29764148 DOI: 10.1063/1.5019376] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Fano interferences in nanostructures are influenced by dissipation effects as well as many-body interactions. Two-dimensional coherent spectroscopies have just begun to be applied to these systems where the spectroscopic signatures of a discrete-continuum structure are not known. In this article, we calculate the excited-state absorption contribution for different models of higher lying excited states. We find that the characteristic asymmetry of one-dimensional spectroscopies is recovered from the many-body contributions and that the higher lying excited manifolds have distorted lineshapes that are not anticipated from discrete-level Hamiltonians. We show that the Stimulated Emission cannot have contributions from a flat continuum of states. This work completes the Ground-State Bleach and Stimulated Emission signals that were calculated previously [D. Finkelstein-Shapiro et al., Phys. Rev. B 94, 205137 (2016)]. The model reproduces the observations reported for molecules on surfaces probed by 2DIR.
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Affiliation(s)
| | - Tõnu Pullerits
- Division of Chemical Physics, Lund University, P.O. Box 124, 221 00 Lund, Sweden
| | - Thorsten Hansen
- Department of Chemistry, University of Copenhagen, DK 2100 Copenhagen, Denmark
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26
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He X, Liu F, Lin F, Shi W. Graphene patterns supported terahertz tunable plasmon induced transparency. OPTICS EXPRESS 2018; 26:9931-9944. [PMID: 29715939 DOI: 10.1364/oe.26.009931] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Accepted: 03/25/2018] [Indexed: 06/08/2023]
Abstract
The tunable plasmonic induced transparency has been theoretically investigated based on graphene patterns/SiO2/Si/polymer multilayer structure in the terahertz regime, including the effects of graphene Fermi level, structural parameters and operation frequency. The results manifest that obvious Fano peak can be observed and efficiently modulated because of the strong coupling between incident light and graphene pattern structures. As Fermi level increases, the peak amplitude of Fano resonance increases, and the resonant peak position shifts to high frequency. The amplitude modulation depth of Fano curves is about 40% on condition that the Fermi level changes in the scope of 0.2-1.0 eV. With the distance between cut wire and double semi-circular patterns increases, the peak amplitude and figure of merit increases. The results are very helpful to develop novel graphene plasmonic devices (e.g. sensors, modulators, and antenna) and find potential applications in the fields of biomedical sensing and wireless communications.
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27
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Zhang J, Chen S, Wang J, Mu K, Fan C, Liang E, Ding P. An engineered CARS substrate with giant field enhancement in crisscross dimer nanostructure. Sci Rep 2018; 8:740. [PMID: 29335467 PMCID: PMC5768707 DOI: 10.1038/s41598-017-18821-w] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Accepted: 12/11/2017] [Indexed: 11/10/2022] Open
Abstract
We theoretically investigate the optical properties of a nanostructure consisting of the two identical and symmetrically arranged crisscrosses. A plasmonic Fano resonance is induced by a strong interplay between bright mode and dark modes, where the bright mode is due to electric dipole resonance while dark modes originate from the magnetic dipole induced by LC resonances. In this article, we find that the electric field "hotspots" corresponding to three different wavelengths can be positioned at the same spatial position, and its spectral tunability is achieved by changing geometric parameters. The crisscrosses system can be designed as a plasmonic substrate for enhancing Coherent Anti-Stokes Raman Scattering (CARS) signal. This discovery provides a new method to achieve single molecule detection. At the same time, it also has many important applications for multi-photon imaging and other nonlinear optical processes, such as four-wave mixing and stimulated Raman scattering.
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Affiliation(s)
- Jia Zhang
- School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou, 450001, China
| | - Shu Chen
- School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou, 450001, China
| | - Junqiao Wang
- School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou, 450001, China.
| | - Kaijun Mu
- School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou, 450001, China
| | - Chunzhen Fan
- School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou, 450001, China
| | - Erjun Liang
- School of Physical Science and Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou, 450001, China
| | - Pei Ding
- Department of Mathematics and Physics, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou, 450015, China
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Saxena SK, Yogi P, Mishra S, Rai HM, Mishra V, Warshi MK, Roy S, Mondal P, Sagdeo PR, Kumar R. Amplification or cancellation of Fano resonance and quantum confinement induced asymmetries in Raman line-shapes. Phys Chem Chem Phys 2017; 19:31788-31795. [PMID: 29170785 DOI: 10.1039/c7cp04836j] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Fano resonance is reported here to be playing a dual role by amplifying or compensating for the quantum confinement effect induced asymmetry in Raman line-shape in silicon (Si) nanowires (NWs) obtained from heavily doped n- and p-type Si wafers respectively. The compensatory nature results in a near symmetric Raman line-shape from heavily doped p-type Si nanowires (NWs) as both the components almost cancel each other. On the other hand, the expected asymmetry, rather with enhancement, has been observed from heavily doped n-type SiNWs. Such a system (p- & n-) dependent Raman line-shape study has been carried out by theoretical line-shape analysis followed by experimental validation through suitably designed experiments. A dual role of Fano resonance in n- and p-type nano systems has been observed to modulate Raman spectra differently and reconcile accordingly to enhance and cease the Raman spectral asymmetry respectively. The present analysis will enable one to be more careful while analyzing a symmetric Raman line-shape from semiconductor nanostructures.
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Affiliation(s)
- Shailendra K Saxena
- Material Research Laboratory, Discipline of Physics & MEMS, Indian Institute of Technology Indore, Simrol-453552, India.
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29
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Fano Effect and Quantum Entanglement in Hybrid Semiconductor Quantum Dot-Metal Nanoparticle System. SENSORS 2017. [PMID: 28632165 PMCID: PMC5492473 DOI: 10.3390/s17061445] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In this paper, we review the investigation for the light-matter interaction between surface plasmon field in metal nanoparticle (MNP) and the excitons in semiconductor quantum dots (SQDs) in hybrid SQD-MNP system under the full quantum description. The exciton-plasmon interaction gives rise to the modified decay rate and the exciton energy shift which are related to the exciton energy by using a quantum transformation method. We illustrate the responses of the hybrid SQD-MNP system to external field, and reveal Fano effect shown in the absorption spectrum. We demonstrate quantum entanglement between two SQD mediated by surface plasmon field. In the absence of a laser field, concurrence of quantum entanglement will disappear after a few ns. If the laser field is present, the steady states appear, so that quantum entanglement produced will reach a steady-state entanglement. Because one of all optical pathways to induce Fano effect refers to the generation of quantum entangled states, It is shown that the concurrence of quantum entanglement can be obtained by observation for Fano effect. In a hybrid system including two MNP and a SQD, because the two Fano quantum interference processes share a segment of all optical pathways, there is correlation between the Fano effects of the two MNP. The investigations for the light-matter interaction in hybrid SQD-MNP system can pave the way for the development of the optical processing devices and quantum information based on the exciton-plasmon interaction.
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30
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Wang Y, Liao L, Hu T, Luo S, Wu L, Wang J, Zhang Z, Xie W, Sun L, Kavokin AV, Shen X, Chen Z. Exciton-Polariton Fano Resonance Driven by Second Harmonic Generation. PHYSICAL REVIEW LETTERS 2017; 118:063602. [PMID: 28234528 DOI: 10.1103/physrevlett.118.063602] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Indexed: 06/06/2023]
Abstract
Angle-resolved second harmonic generation (SHG) spectra of ZnO microwires show characteristic Fano resonances in the spectral vicinity of exciton-polariton modes. We observe a resonant peak followed by a strong dip in SHG originating from the constructive and destructive interference of the nonresonant SHG and the resonant contribution of the polariton mode. It is demonstrated that the Fano line shape, and thus the Fano asymmetry parameter q, can be tuned by the phase shift of the two channels. We develop a model to calculate the phase-dependent q as a function of the radial angle in the microwire and achieve a good agreement with the experimental results. The deduced phase-to-q relation unveils the crucial information about the dynamics of the system and offers a tool for control on the line shape of the SHG spectra in the vicinity of exciton-polariton modes.
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Affiliation(s)
- Yafeng Wang
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing Jiangsu 210093, China
| | - Liming Liao
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing Jiangsu 210093, China
| | - Tao Hu
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing Jiangsu 210093, China
| | - Song Luo
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing Jiangsu 210093, China
| | - Lin Wu
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing Jiangsu 210093, China
| | - Jun Wang
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing Jiangsu 210093, China
| | - Zhe Zhang
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing Jiangsu 210093, China
| | - Wei Xie
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing Jiangsu 210093, China
| | - Liaoxin Sun
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing Jiangsu 210093, China
| | - A V Kavokin
- University of Southampton, Highfield, Southampton SO249QH, United Kingdom
- SPIN-CNR, Viale del Politechnico 1, I-00133 Rome, Italy
- Spin Optics Laboratory, St-Petersburg State University, 1 Ulianovskaya, St-Petersburg, 198504, Russia
| | - Xuechu Shen
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing Jiangsu 210093, China
| | - Zhanghai Chen
- State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing Jiangsu 210093, China
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31
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Manjappa M, Srivastava YK, Cong L, Al-Naib I, Singh R. Active Photoswitching of Sharp Fano Resonances in THz Metadevices. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1603355. [PMID: 27862423 DOI: 10.1002/adma.201603355] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2016] [Revised: 09/21/2016] [Indexed: 05/20/2023]
Abstract
Fano resonances offer exciting features in enhancing the non-linearity and sensing capabilities in metamaterial systems. An active photoswitching of Fano resonances in a terahertz metadevice at low optical pump powers is demonstrated, which signifies the extreme sensitivity of the high-quality-factor resonant electric field to the external light illumination.
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Affiliation(s)
- Manukumara Manjappa
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Yogesh Kumar Srivastava
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Longqing Cong
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Ibraheem Al-Naib
- Biomedical Engineering Department, College of Engineering, University of Dammam, Dammam, 31441, Saudi Arabia
| | - Ranjan Singh
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
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32
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Yogi P, Mishra S, Saxena SK, Kumar V, Kumar R. Fano Scattering: Manifestation of Acoustic Phonons at the Nanoscale. J Phys Chem Lett 2016; 7:5291-5296. [PMID: 27973889 DOI: 10.1021/acs.jpclett.6b02090] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Size-dependent asymmetric low-frequency Raman line shapes have been observed from silicon (Si) nanostructures (NSs) due to a quantum confinement effect. The acoustic phonons in Si NSs interact with an intraband quasi-continuum to give rise to Fano interaction in the low-frequency range. The experimental asymmetric Raman line shape has been explained by developing a theoretical model that incorporates the quantum-confined phonons interacting with an intraband quasi-continuum available in Si NSs as a result of discretization of energy levels with unequal separation. We discover that a phenomenon similar to Brillouin scattering is possible at the nanoscale in the low-frequency regime and thus may be called "Fano scattering" in general. A method has been proposed to extract information about nonradiative transitions from the Fano scattering data where these nonradiative transitions are involved as an intraband quasi-continuum in modulation with discrete acoustic phonons.
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Affiliation(s)
- Priyanka Yogi
- Material Research Laboratory, Discipline of Physics & MEMS, Indian Institute of Technology Indore , Simrol 453552, India
| | - Suryakant Mishra
- Material Research Laboratory, Discipline of Physics & MEMS, Indian Institute of Technology Indore , Simrol 453552, India
| | - Shailendra K Saxena
- Material Research Laboratory, Discipline of Physics & MEMS, Indian Institute of Technology Indore , Simrol 453552, India
| | - Vivek Kumar
- Department of Physics, National Institute of Technology Meghalaya , Laitumkhrah, Shillong 793003, Meghalaya, India
| | - Rajesh Kumar
- Material Research Laboratory, Discipline of Physics & MEMS, Indian Institute of Technology Indore , Simrol 453552, India
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33
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Zhao G, Zhao T, Xiao H, Liu Z, Liu G, Yang J, Ren Z, Bai J, Tian Y. Tunable Fano resonances based on microring resonator with feedback coupled waveguide. OPTICS EXPRESS 2016; 24:20187-20195. [PMID: 27607626 DOI: 10.1364/oe.24.020187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We experimentally demonstrate a tunable Fano resonance which originates from the optical interference between two different resonant cavities using silicon micro-ring resonator with feedback coupled waveguide fabricated on silicon-on-insulator (SOI) substrate. The resonance spectrum can be periodically tuned via changing the resonant wavelengths of two resonators through the thermo-optic effect. In addition to this, we can also change the transmission loss of the feedback coupled waveguide (FCW) to tune the resonance spectrum by the injection free carriers to FCW. We also build the theoretical model and we analyze the device performance by using the scattering matrix method. The simulation results are in a good agreement with the experimental results. The measurement maximum extinction ratio of the Fano resonance is as high as 30.8dB. Therefore, the proposed device is a most promising candidate for high on/off ratio optical switching/modulating, high-sensitivity biochemical sensing.
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34
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Qin M, Shen HZ, Yi XX. A multi-pathway model for photosynthetic reaction center. J Chem Phys 2016; 144:125103. [PMID: 27036480 DOI: 10.1063/1.4944730] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Charge separation occurs in a pair of tightly coupled chlorophylls at the heart of photosynthetic reaction centers of both plants and bacteria. Recently it has been shown that quantum coherence can, in principle, enhance the efficiency of a solar cell, working like a quantum heat engine. Here, we propose a biological quantum heat engine (BQHE) motivated by Photosystem II reaction center (PSII RC) to describe the charge separation. Our model mainly considers two charge-separation pathways which is more than that typically considered in the published literature. We explore how these cross-couplings increase the current and power of the charge separation and discuss the effects of multiple pathways in terms of current and power. The robustness of the BQHE against the charge recombination in natural PSII RC and dephasing induced by environments is also explored, and extension from two pathways to multiple pathways is made. These results suggest that noise-induced quantum coherence helps to suppress the influence of acceptor-to-donor charge recombination, and besides, nature-mimicking architectures with engineered multiple pathways for charge separations might be better for artificial solar energy devices considering the influence of environments.
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Affiliation(s)
- M Qin
- School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
| | - H Z Shen
- School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
| | - X X Yi
- Center for Quantum Sciences and School of Physics, Northeast Normal University, Changchun 130024, China
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35
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Abstract
A strong chiral optical response induced at a plasmonic Fano resonance in a planar Au heptamer nanostructure was experimentally and theoretically demonstrated. The scattering spectra show the characteristic narrow-band feature of Fano resonances for both left and right circular polarized lights, with a chiral response reaching 30% at the Fano resonance. Specifically, we systematically investigate the chiral response of planar heptamers with gradually changing the inter-particle rotation angles and separation distance. The chiral spectral characteristics clearly depend on the strength of Fano resonances and the associated near-field optical distributions. Finite element method simulations together with a multipole expansion method demonstrate that the enhanced chirality is caused by the excitation of magnetic quadrupolar and electric toroidal dipolar modes. Our work provides an effective method for the design of 2D nanostructures with a strong chiral response.
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Affiliation(s)
- Shuai Zu
- School of Physics, State Key Lab for Mesoscopic Physics, Peking University, Beijing 100871, China.
| | - Yanjun Bao
- School of Physics, State Key Lab for Mesoscopic Physics, Peking University, Beijing 100871, China.
| | - Zheyu Fang
- School of Physics, State Key Lab for Mesoscopic Physics, Peking University, Beijing 100871, China. and Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
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36
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Zhang J, Zhang X. Fano-like coupling between two oppositely enhanced processes by diffraction in a dielectric grating. OPTICS EXPRESS 2015; 23:30429-30437. [PMID: 26698522 DOI: 10.1364/oe.23.030429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Fano-like coupling was investigated extensively in plasmonic nanostructures, which is based on the interaction between the photonic and plasmonic resonance modes. Metallic photonic crystals consisting of waveguide metallic gratings are typical devices exhibiting strong Fano-coupling between waveguide and plasmon resonance modes. However, we demonstrate here that similar effects can also be achieved in waveguide dielectric grating structures. In this case, the broad-band strong optical extinction results from multifold diffraction processes, instead of the plasmonic absorption and scattering of light. The diffraction efficiency of the waveguide dielectric gratings was tuned by changing the duty cycle through adjusting the exposure time in interference lithography. Enhanced diffraction efficiency reduces the direct transmission while enhances the waveguide resonance mode, leading to a Fano-like coupling process.
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37
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Finkelstein-Shapiro D, Urdaneta I, Calatayud M, Atabek O, Mujica V, Keller A. Fano-Liouville spectral signatures in open quantum systems. PHYSICAL REVIEW LETTERS 2015; 115:113006. [PMID: 26406830 DOI: 10.1103/physrevlett.115.113006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Indexed: 06/05/2023]
Abstract
The scattering amplitude from a set of discrete states coupled to a continuum became known as the Fano profile, characteristic for its asymmetric line shape and originally investigated in the context of photoionization. The generality of the model and the proliferation of engineered nanostructures with confined states gives immense success to the Fano line shape, which is invoked whenever an asymmetric line shape is encountered. However, many of these systems do not conform to the initial model worked out by Fano in that (i) they are subject to dissipative processes and (ii) the observables are not entirely analogous to the ones measured in the original photoionization experiments. In this Letter, we work out the full optical response of a Fano model with dissipation. We find that the exact result for the excited population, Raman, Rayleigh, and fluorescence emission is a modified Fano profile where the typical line shape has an additional Lorentzian contribution. Expressions to extract model parameters from a set of relevant observables are given.
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Affiliation(s)
- Daniel Finkelstein-Shapiro
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85282, USA
- Sorbonne Universités, UPMC Université Paris 06, UMR 7616, Laboratoire de Chimie Théorique, F-75005 Paris, France
- CNRS, UMR 7616, Laboratoire de Chimie Théorique, F-75005 Paris, France
| | - Ines Urdaneta
- Sorbonne Universités, UPMC Université Paris 06, UMR 7616, Laboratoire de Chimie Théorique, F-75005 Paris, France
- CNRS, UMR 7616, Laboratoire de Chimie Théorique, F-75005 Paris, France
- Institut des Sciences Moléculaires d'Orsay, Bâtiment 350, UMR8214, CNRS-Université Paris-Sud, 91405 Orsay, France
| | - Monica Calatayud
- Sorbonne Universités, UPMC Université Paris 06, UMR 7616, Laboratoire de Chimie Théorique, F-75005 Paris, France
- CNRS, UMR 7616, Laboratoire de Chimie Théorique, F-75005 Paris, France
- Institut Universitaire de France, France
| | - Osman Atabek
- Institut des Sciences Moléculaires d'Orsay, Bâtiment 350, UMR8214, CNRS-Université Paris-Sud, 91405 Orsay, France
| | - Vladimiro Mujica
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85282, USA
| | - Arne Keller
- Institut des Sciences Moléculaires d'Orsay, Bâtiment 350, UMR8214, CNRS-Université Paris-Sud, 91405 Orsay, France
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38
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Xia JJ, Duan SQ, Zhang W. Detection of Majorana fermions by Fano resonance in hybrid nanostructures. NANOSCALE RESEARCH LETTERS 2015; 10:223. [PMID: 26034416 PMCID: PMC4446293 DOI: 10.1186/s11671-015-0914-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 04/25/2015] [Indexed: 06/01/2023]
Abstract
The realization and detection of Majorana fermions in condensed matter systems are of considerable importance and interest. We propose a scheme to detect the Majorana fermions by Fano resonance in hybrid nanostructures made of semiconductor quantum dots and quantum wire in proximity to superconductor. Through detailed theoretical studies of the transport properties of our hybrid nanostructures based on the non-equilibrium Green's function technique and the equation of motion approach, it is found that the Fano resonance in the current response due to the interference among different transmission paths may give clear signature of the existence of Majorana modes. Moreover, we have found a peculiar relationship between the Fano factor q and the Majorana bound state coupling strength/the length of nanowire, which can be used for a design of an electronic nanoruler. Our method of detection of Majorana fermions based on Fano resonance is related to the global conductance profile, thus is robust to perturbations.
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Affiliation(s)
- Jun-Jie Xia
- Institute of Applied Physics and Computational Mathematics, Beijing, P. O. Box 8009(28), 100088 China
| | - Su-Qing Duan
- Institute of Applied Physics and Computational Mathematics, Beijing, P. O. Box 8009(28), 100088 China
| | - Wei Zhang
- Institute of Applied Physics and Computational Mathematics, Beijing, P. O. Box 8009(28), 100088 China
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Nan F, Zhang YF, Li X, Zhang XT, Li H, Zhang X, Jiang R, Wang J, Zhang W, Zhou L, Wang JH, Wang QQ, Zhang Z. Unusual and tunable one-photon nonlinearity in gold-dye plexcitonic Fano systems. NANO LETTERS 2015; 15:2705-10. [PMID: 25756956 DOI: 10.1021/acs.nanolett.5b00413] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Recent studies of the coupling between the plasmonic excitations of metallic nanostructures with the excitonic excitations of molecular species have revealed a rich variety of emergent phenomena known as plexcitonics. Here, we use a combined experimental and theoretical approach to demonstrate new and intriguing aspects in the ultrafast nonlinear responses of strongly coupled hybrid Fano systems consisting of gold nanorods decorated with near-infrared dye molecules. We show that the severely suppressed linear absorption around the Fano dip significantly enhances the unidirectional energy transfer from the plasmons to the excitons and further allows one-photon nonlinearity to be drastically and reversibly tuned. These striking observations are interpreted within a microscopic model stressing on two competing processes: saturated plasmonic absorption and weakened destructive Fano interference from the bleached excitonic absorption. The unusually strong one-photon nonlinearity revealed here provides a promising strategy in fabricating nanoplasmonic devices with both pronounced nonlinearities and good figures of merit.
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Affiliation(s)
- Fan Nan
- †Department of Physics, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
| | - Ya-Fang Zhang
- †Department of Physics, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
| | - Xiaoguang Li
- ‡Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, People's Republic of China
- §International Center for Quantum Design of Functional Materials (ICQD), University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Xiao-Tian Zhang
- §International Center for Quantum Design of Functional Materials (ICQD), University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Hang Li
- ∥State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People's Republic of China
| | - Xinhui Zhang
- ∥State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People's Republic of China
| | - Ruibin Jiang
- ⊥Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR People's Republic of China
| | - Jianfang Wang
- ⊥Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR People's Republic of China
| | - Wei Zhang
- #Institute of Applied Physics and Computational Mathematics, Beijing 100088, People's Republic of China
| | - Li Zhou
- †Department of Physics, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
| | - Jia-Hong Wang
- †Department of Physics, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
| | - Qu-Quan Wang
- †Department of Physics, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
- ∇Institute for Advanced Study, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
| | - Zhenyu Zhang
- §International Center for Quantum Design of Functional Materials (ICQD), University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
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40
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Crespi A, Sansoni L, Della Valle G, Ciamei A, Ramponi R, Sciarrino F, Mataloni P, Longhi S, Osellame R. Particle statistics affects quantum decay and Fano interference. PHYSICAL REVIEW LETTERS 2015; 114:090201. [PMID: 25793783 DOI: 10.1103/physrevlett.114.090201] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Indexed: 06/04/2023]
Abstract
Quantum mechanical decay, Fano interference, and bound states with energy in the continuum are ubiquitous phenomena in different areas of physics. Here we experimentally demonstrate that particle statistics strongly affects quantum mechanical decay in a multiparticle system. By considering propagation of two-photon states in engineered photonic lattices, we simulate quantum decay of two noninteracting particles in a multilevel Fano-Anderson model. Remarkably, when the system sustains a bound state in the continuum, fractional decay is observed for bosonic particles, but not for fermionic ones. Complete decay in the fermionic case arises because of the Pauli exclusion principle, which forbids the bound state to be occupied by the two fermions. Our experiment indicates that particle statistics can tune many-body quantum decay from fractional to complete.
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Affiliation(s)
- Andrea Crespi
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Linda Sansoni
- Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185 Roma, Italy
| | - Giuseppe Della Valle
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Alessio Ciamei
- Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185 Roma, Italy
| | - Roberta Ramponi
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Fabio Sciarrino
- Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185 Roma, Italy
| | - Paolo Mataloni
- Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185 Roma, Italy
| | - Stefano Longhi
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Roberto Osellame
- Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
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41
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Sun J, Li G, Liang W. How does the plasmonic enhancement of molecular absorption depend on the energy gap between molecular excitation and plasmon modes: a mixed TDDFT/FDTD investigation. Phys Chem Chem Phys 2015; 17:16835-45. [DOI: 10.1039/c5cp00846h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A real-time time-dependent density functional theory method coupled with the classical electrodynamics finite difference time domain technique is employed to systematically investigate the optical properties of hybrid systems composed of silver nanoparticles (NPs) and organic adsorbates.
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Affiliation(s)
- Jin Sun
- School of Physics and Materials Science
- Anhui University
- Hefei 230601
- People's Republic of China
| | - Guang Li
- School of Physics and Materials Science
- Anhui University
- Hefei 230601
- People's Republic of China
| | - WanZhen Liang
- State Key Laboratory of Physical Chemistry of Solid Surfaces
- Collaborative Innovation Center of Chemistry for Energy Materials
- and Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
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42
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Debnath S, Said SM, Rabilloud F, Chatterjee A, Rashid MM, Mainal A. Al–X and Cu–X [X = Li, Na] nano-alloys: a low cost alternative to silver and gold nanoparticles for plasmonic applications. RSC Adv 2015. [DOI: 10.1039/c5ra10135b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Single X atom (X = Li and Na) is doped into Cu and Al to form Cu12X and Al12X clusters. The Al12X clusters exhibit remarkable optical absorption properties in the range of 3–11 eV.
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Affiliation(s)
- Shaikat Debnath
- Department of Electrical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Suhana Mohd Said
- Department of Electrical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Franck Rabilloud
- Institut Lumière Matière
- UMR5306 Université Claude Bernard Lyon 1-CNRS
- Université de Lyon
- 69622 Villeurbanne cedex
- France
| | | | - Mohammad Mamunur Rashid
- Department of Electrical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Azizah Mainal
- Department of Chemistry
- Faculty of Science
- University of Malaya
- Kuala Lumpur
- Malaysia
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43
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Yang ZJ, Hao ZH, Lin HQ, Wang QQ. Plasmonic Fano resonances in metallic nanorod complexes. NANOSCALE 2014; 6:4985-4997. [PMID: 24733287 DOI: 10.1039/c3nr06502b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Plasmonic Fano resonances (FRs) in nanostructures have been extensively studied in recent years. Nanorod-based complexes for FRs have also attracted much attention. The basic optical properties and fabrication technology of different kinds of plasmonic nanorods have been greatly developed over the last several years. The mutipole plasmon resonances and their flexible adjustment ranges on nanorods make them promising for FR modifications and structure diversity. In this paper, we review some recently studied plasmonic nanorod based nanostructures for FRs, including single nanorods, dimers, mutipole rods and nanorod-nanoparticle hybrids. The corresponding applications of the FRs are also briefly discussed.
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Affiliation(s)
- Zhong-Jian Yang
- Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China.
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44
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Optophononics with coupled quantum dots. Nat Commun 2014; 5:3299. [PMID: 24534815 DOI: 10.1038/ncomms4299] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 01/22/2014] [Indexed: 11/08/2022] Open
Abstract
Modern technology is founded on the intimate understanding of how to utilize and control electrons. Next to electrons, nature uses phonons, quantized vibrations of an elastic structure, to carry energy, momentum and even information through solids. Phonons permeate the crystalline components of modern technology, yet in terms of technological utilization phonons are far from being on par with electrons. Here we demonstrate how phonons can be employed to render a single quantum dot pair optically transparent. This phonon-induced transparency is realized via the formation of a molecular polaron, the result of a Fano-type quantum interference, which proves that we have accomplished making typically incoherent and dissipative phonons behave in a coherent and non-dissipative manner. We find the transparency to be widely tunable by electronic and optical means. Thereby we show amplification of weakest coupling channels. We further outline the molecular polaron's potential as a control element in phononic circuitry architecture.
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45
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Fransson J, Kang MG, Yoon Y, Xiao S, Ochiai Y, Reno JL, Aoki N, Bird JP. Tuning the Fano resonance with an intruder continuum. NANO LETTERS 2014; 14:788-793. [PMID: 24460187 DOI: 10.1021/nl404133d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Through a combination of experiment and theory we establish the possibility of achieving strong tuning of Fano resonances (FRs), by allowing their usual two-path geometry to interfere with an additional, "intruder", continuum. As the coupling strength to this intruder is varied, we predict strong modulations of the resonance line shape that, in principle at least, may exceed the amplitude of the original FR itself. For a proof-of-concept demonstration of this phenomenon, we construct a nanoscale interferometer from nonlocally coupled quantum point contacts and utilize the unique features of their density of states to realize the intruder. External control of the intruder coupling is enabled by means of an applied magnetic field, in the presence of which we demonstrate the predicted distortions of the FR. This general scheme for resonant control should be broadly applicable to a variety of wave-based systems, opening up the possibility of new applications in areas such as chemical and biological sensing and secure communications.
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Affiliation(s)
- J Fransson
- Department of Physics and Astronomy, Uppsala University , Box 534, SE-751 21, Uppsala, Sweden
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46
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Shang GL, Fei GT, Zhang Y, Yan P, Xu SH, Ouyang HM, Zhang LD. Fano resonance in anodic aluminum oxide based photonic crystals. Sci Rep 2014; 4:3601. [PMID: 24398625 PMCID: PMC3884230 DOI: 10.1038/srep03601] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Accepted: 12/10/2013] [Indexed: 11/09/2022] Open
Abstract
Anodic aluminum oxide based photonic crystals with periodic porous structure have been prepared using voltage compensation method. The as-prepared sample showed an ultra-narrow photonic bandgap. Asymmetric line-shape profiles of the photonic bandgaps have been observed, which is attributed to Fano resonance between the photonic bandgap state of photonic crystal and continuum scattering state of porous structure. And the exhibited Fano resonance shows more clearly when the sample is saturated ethanol gas than air-filled. Further theoretical analysis by transfer matrix method verified these results. These findings provide a better understanding on the nature of photonic bandgaps of photonic crystals made up of porous materials, in which the porous structures not only exist as layers of effective-refractive-index material providing Bragg scattering, but also provide a continuum light scattering state to interact with Bragg scattering state to show an asymmetric line-shape profile.
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Affiliation(s)
- Guo Liang Shang
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, P. O. Box 1129, Hefei, 230031, P. R. China
| | - Guang Tao Fei
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, P. O. Box 1129, Hefei, 230031, P. R. China
| | - Yao Zhang
- 1] Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, P. O. Box 1129, Hefei, 230031, P. R. China [2] Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Peng Yan
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, P. O. Box 1129, Hefei, 230031, P. R. China
| | - Shao Hui Xu
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, P. O. Box 1129, Hefei, 230031, P. R. China
| | - Hao Miao Ouyang
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, P. O. Box 1129, Hefei, 230031, P. R. China
| | - Li De Zhang
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, P. O. Box 1129, Hefei, 230031, P. R. China
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48
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Warburton RJ. Single spins in self-assembled quantum dots. NATURE MATERIALS 2013; 12:483-93. [PMID: 23695745 DOI: 10.1038/nmat3585] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Accepted: 01/29/2013] [Indexed: 05/22/2023]
Abstract
Self-assembled quantum dots have excellent photonic properties. For instance, a single quantum dot is a high-brightness, narrow-linewidth source of single photons. Furthermore, the environment of a single quantum dot can be tailored relatively easily using semiconductor heterostructure and post-growth processing techniques, enabling electrical control of the quantum dot charge and control over the photonic modes with which the quantum dot interacts. A single electron or hole trapped inside a quantum dot has spintronics applications. Although the spin dephasing is rather rapid, a single spin can be manipulated using optical techniques on subnanosecond timescales. Optical experiments are also providing new insights into old issues, such as the central spin problem. This Review provides a snapshot of this active field, with some indications for the future. It covers the basic materials and optical properties of single quantum dots, techniques for initializing, manipulating and reading out single spin qubits, and the mechanisms that limit the electron-spin and hole-spin coherence.
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49
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Ott C, Kaldun A, Raith P, Meyer K, Laux M, Evers J, Keitel CH, Greene CH, Pfeifer T. Lorentz meets Fano in spectral line shapes: a universal phase and its laser control. Science 2013; 340:716-20. [PMID: 23661754 DOI: 10.1126/science.1234407] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Symmetric Lorentzian and asymmetric Fano line shapes are fundamental spectroscopic signatures that quantify the structural and dynamical properties of nuclei, atoms, molecules, and solids. This study introduces a universal temporal-phase formalism, mapping the Fano asymmetry parameter q to a phase φ of the time-dependent dipole response function. The formalism is confirmed experimentally by laser-transforming Fano absorption lines of autoionizing helium into Lorentzian lines after attosecond-pulsed excitation. We also demonstrate the inverse, the transformation of a naturally Lorentzian line into a Fano profile. A further application of this formalism uses quantum-phase control to amplify extreme-ultraviolet light resonantly interacting with He atoms. The quantum phase of excited states and its response to interactions can thus be extracted from line-shape analysis, with applications in many branches of spectroscopy.
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Affiliation(s)
- Christian Ott
- Max-Planck-Institut für Kernphysik, Heidelberg, Germany
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50
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Chen H, Shao L, Man YC, Zhao C, Wang J, Yang B. Fano resonance in (gold core)-(dielectric shell) nanostructures without symmetry breaking. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:1503-1509. [PMID: 22415984 DOI: 10.1002/smll.201200032] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Revised: 01/31/2012] [Indexed: 05/31/2023]
Abstract
A Fano resonance is observed in highly symmetric nanostructures comprising Au nanosphere cores and dielectric shells. It arises from the interference between the narrow plasmon resonance of the Au nanosphere core and the broad scattering background of the dielectric shell. The Fano resonance behavior is dependent on the gap distance between the core and shell and the shell material.
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Affiliation(s)
- Huanjun Chen
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
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