1
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Medina-Vázquez JA, González-Ramírez EY, Murillo-Ramírez JG. Topological Fano-resonance with type-II and type-III corner states. OPTICS LETTERS 2024; 49:3263-3266. [PMID: 38824379 DOI: 10.1364/ol.524980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Accepted: 05/21/2024] [Indexed: 06/03/2024]
Abstract
Topological corner states have been used to develop topologically robust Fano-resonant systems immune to structural perturbations while preserving the ultra-sensitive profiles under external factors. In this work, we have extended the possibility of obtaining Fano-resonant systems by introducing type-II and type-III corner states with a large modal surface to this class of resonance. Through photonic lattices with low symmetry, such as C2, it is easy to obtain type-II and type-III corner states due to the tailoring of long-range interactions. Subsequently, one can combine topological cavities of type-II and type-III corner modes with topological waveguides obtained from a first-order topological insulating phase. Our results may pave the way to generate devices suitable for creating non-classical light applicable in quantum computing and ultra-sensitive sensors employing large-area topological states.
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2
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Barański J, Barańska M, Zienkiewicz T, Kapcia KJ. Quench dynamics of Fano-like resonances in the presence of the on-dot superconducting pairing. Sci Rep 2023; 13:7639. [PMID: 37169768 PMCID: PMC10175302 DOI: 10.1038/s41598-023-34376-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Accepted: 04/28/2023] [Indexed: 05/13/2023] Open
Abstract
We explore the electron dynamics of a system composed of double quantum dot embedded between metallic and superconducting leads in a "T-shape" geometry. In nanoscopic systems, where electron transfer between electrodes can be realized via different paths, interference effects play an important role. For double quantum dot system in the chosen geometry, interference of electrons transferred between electrodes via the interfacial quantum dot and electrons scattered on the side dot gives rise to Fano-like interference. If such a system is additionally coupled to a superconducting electrode, together with the well-understood Fano resonance an additional resonance appears on the opposite side of the Fermi level. In the recent work (Barański et al. in Sci Rep 10:2881, 2020), we showed that this resonance occurs solely as a result of the local pairing of non-scattered electrons with scattered ones. In this work, considering the quench dynamics, we explore how much time is required for formation of each of these resonances. In particular, (i) we analyze the charge oscillations between subsystems; (ii) we estimate the time required for each resonance to achieve stable equilibrium upon an abrupt change of interdot connection; (iii) we discuss a typical energy and time scales for experiments on similar architectures.
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Affiliation(s)
- Jan Barański
- Department of General Education, Polish Air Force University, ul. Dywizjonu 303 nr 35, 08521, Deblin, Poland.
| | - Magdalena Barańska
- Department of General Education, Polish Air Force University, ul. Dywizjonu 303 nr 35, 08521, Deblin, Poland
| | - Tomasz Zienkiewicz
- Department of General Education, Polish Air Force University, ul. Dywizjonu 303 nr 35, 08521, Deblin, Poland
| | - Konrad Jerzy Kapcia
- Institute of Spintronics and Quantum Information, Faculty of Physics, Adam Mickiewicz University in Poznań, ul. Uniwersytetu Poznańskiego 2, 61614, Poznań, Poland.
- Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany.
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3
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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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4
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Ma ZR, Huang XC, Li TJ, Wang HC, Liu GC, Wang ZS, Li B, Li WB, Zhu LF. First Observation of New Flat Line Fano Profile via an X-Ray Planar Cavity. PHYSICAL REVIEW LETTERS 2022; 129:213602. [PMID: 36461956 DOI: 10.1103/physrevlett.129.213602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 11/10/2021] [Accepted: 09/27/2022] [Indexed: 06/17/2023]
Abstract
A new Fano profile of a flat line is achieved experimentally by manipulating the relative amplitude of the continuum path, when q takes the pure imaginary number of -i in the x-ray regime. The underlying mechanism is that the interference term in the scattering will cancel the discrete term exactly. This new Fano profile renders only an observable continuum along with an invisible response to the discrete state of atomic resonance. The results suggest not only a different strategy to invisibility studies which provides a possible tool to identify weaker structures hidden by the strong white line, but also a new scenario to enrich the manipulations of two-path interference and nonlinear Fano resonance.
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Affiliation(s)
- Zi-Ru Ma
- Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Xin-Chao Huang
- Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Tian-Jun Li
- Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Hong-Chang Wang
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
| | - Gen-Chang Liu
- MOE Key Laboratory of Advanced Micro-Structured Materials, Institute of Precision Optical Engineering (IPOE), School of Physics science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Zhan-Shan Wang
- MOE Key Laboratory of Advanced Micro-Structured Materials, Institute of Precision Optical Engineering (IPOE), School of Physics science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Bo Li
- Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Wen-Bin Li
- MOE Key Laboratory of Advanced Micro-Structured Materials, Institute of Precision Optical Engineering (IPOE), School of Physics science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Lin-Fan Zhu
- Hefei National Research Center for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
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5
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Huang YQ, Beyer J, Puttisong Y, Buyanova IA, Chen WM. Identifying a Generic and Detrimental Role of Fano Resonance in Spin Generation in Semiconductor Nanostructures. PHYSICAL REVIEW LETTERS 2021; 127:127401. [PMID: 34597090 DOI: 10.1103/physrevlett.127.127401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 07/18/2021] [Accepted: 08/19/2021] [Indexed: 06/13/2023]
Abstract
Fano resonance is a fundamental physical process that strongly affects the electronic transport, optical, and vibronic properties of matter. Here, we provide the first experimental demonstration of its profound effect on spin properties in semiconductor nanostructures. We show that electron spin generation in InAs/GaAs quantum-dot structures is completely quenched upon spin injection from adjacent InGaAs wetting layers at the Fano resonance due to coupling of light-hole excitons and the heavy-hole continuum of the interband optical transitions, mediated by an anisotropic exchange interaction. Using a master equation approach, we show that such quenching of spin generation is robust and independent of Fano parameters. This work therefore identifies spin-dependent Fano resonance as a universal spin loss channel in quantum-dot systems with an inherent symmetry-breaking effect.
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Affiliation(s)
- Y Q Huang
- Department of Physics, Chemistry and Biology, Linköping University, S-58183 Linköping, Sweden
| | - J Beyer
- Department of Physics, Chemistry and Biology, Linköping University, S-58183 Linköping, Sweden
| | - Y Puttisong
- Department of Physics, Chemistry and Biology, Linköping University, S-58183 Linköping, Sweden
| | - I A Buyanova
- Department of Physics, Chemistry and Biology, Linköping University, S-58183 Linköping, Sweden
| | - W M Chen
- Department of Physics, Chemistry and Biology, Linköping University, S-58183 Linköping, Sweden
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6
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Guchhait S, B S A, Modak N, Nayak JK, Panda A, Pal M, Ghosh N. Natural weak value amplification in Fano resonance and giant Faraday rotation in magneto-plasmonic crystal. Sci Rep 2020; 10:11464. [PMID: 32651415 PMCID: PMC7351789 DOI: 10.1038/s41598-020-68126-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 06/11/2020] [Indexed: 11/27/2022] Open
Abstract
The extraordinary concept of weak value amplification can be formulated within the realm of wave interference as nearly destructive interference between the eigenstates of the measuring observable. Here we report on a phenomenon of interferometric weak value amplification of small polarization rotation in Fano resonance that evolves completely naturally due to near destructive spectral domain interference between a continuum and a narrow resonance mode having slightly different polarization response. In order to elucidate this, we first experimentally demonstrate an interferometric weak value amplification concept by generating nearly destructive interference of two paths of an interferometer having slightly rotated linear polarization states of light. The weak value amplification of polarization rotation effect is manifested as dramatic changes in the polarization state of light, which acts as the pointer. We go on to demonstrate that the manifestation of natural interferometric weak value amplification is an important contributing factor to the observed giant Faraday rotation and ellipticity in waveguided magneto-plasmonic crystals exhibiting prominent Fano resonance. The natural weak value interpretation of the enhanced Faraday rotation in hybrid magneto-plasmonic systems enriches the existing understanding on its origin. This opens up a new paradigm of natural weak measurement for gaining fundamental insights and ensuing practical applications on various weak interaction effects in rich variety of wave phenomena that originate from fine interference effects.
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Affiliation(s)
- Shyamal Guchhait
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, India
| | - Athira B S
- Center of Excellence in Space Sciences India, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, India
| | - Niladri Modak
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, India
| | - Jeeban Kumar Nayak
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, India
| | - Anwesha Panda
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, India
| | - Mandira Pal
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, India
| | - Nirmalya Ghosh
- Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, India. .,Center of Excellence in Space Sciences India, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, India.
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7
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Smith KC, Olafsson A, Hu X, Quillin SC, Idrobo JC, Collette R, Rack PD, Camden JP, Masiello DJ. Direct Observation of Infrared Plasmonic Fano Antiresonances by a Nanoscale Electron Probe. PHYSICAL REVIEW LETTERS 2019; 123:177401. [PMID: 31702260 DOI: 10.1103/physrevlett.123.177401] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Indexed: 06/10/2023]
Abstract
In this Letter, we exploit recent breakthroughs in monochromated aberration-corrected scanning transmission electron microscopy (STEM) to resolve infrared plasmonic Fano antiresonances in individual nanofabricated disk-rod dimers. Using a combination of electron energy-loss spectroscopy and theoretical modeling, we investigate and characterize a subspace of the weak coupling regime between quasidiscrete and quasicontinuum localized surface plasmon resonances where infrared plasmonic Fano antiresonances appear. This work illustrates the capability of STEM instrumentation to experimentally observe nanoscale plasmonic responses that were previously the domain only of higher-resolution infrared spectroscopies.
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Affiliation(s)
- Kevin C Smith
- Department of Physics, University of Washington, Seattle, Washington 98195, USA
| | - Agust Olafsson
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Xuan Hu
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Steven C Quillin
- Department of Chemistry, University of Washington, Seattle, Washington 98195, USA
| | - Juan Carlos Idrobo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Robyn Collette
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Philip D Rack
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Jon P Camden
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - David J Masiello
- Department of Chemistry, University of Washington, Seattle, Washington 98195, USA
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8
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Zangeneh-Nejad F, Fleury R. Topological Fano Resonances. PHYSICAL REVIEW LETTERS 2019; 122:014301. [PMID: 31012649 DOI: 10.1103/physrevlett.122.014301] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Indexed: 06/09/2023]
Abstract
The Fano resonance is a widespread wave scattering phenomenon associated with a peculiar asymmetric and ultrasharp line shape, which has found applications in a large variety of prominent optical devices. While its substantial sensitivity to geometrical and environmental changes makes it the cornerstone of efficient sensors, it also renders the practical realization of Fano-based systems extremely challenging. Here, we introduce the concept of topological Fano resonance, whose ultrasharp asymmetric line shape is guaranteed by design and protected against geometrical imperfections, yet remaining sensitive to external parameters. We report the experimental observation of such resonances in an acoustic system, and demonstrate their inherent robustness to geometrical disorder. Such topologically protected Fano resonances, which can also be found in microwave, optical, and plasmonic systems, open up exciting frontiers for the generation of various reliable wave-based devices including low-threshold lasers, perfect absorbers, ultrafast switches or modulators, and highly accurate interferometers, by circumventing the performance degradations caused by inadvertent fabrication flaws.
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Affiliation(s)
- Farzad Zangeneh-Nejad
- Laboratory of Wave Engineering, School of Engineering, EPFL, Station 11, 1015 Lausanne, Switzerland
| | - Romain Fleury
- Laboratory of Wave Engineering, School of Engineering, EPFL, Station 11, 1015 Lausanne, Switzerland
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9
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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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10
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Abstract
In this work, we address the ubiquitous phenomenon of Fano resonances in bilayer graphene. We consider that this phenomenon is as exotic as other phenomena in graphene because it can arise without an external extended states source or elaborate nano designs. However, there are not theoretical and/or experimental studies that report the impact of Fano resonances on the transport properties. Here, we carry out a systematic assessment of the contribution of the Fano resonances on the transport properties of bilayer graphene superlattices. Specifically, we find that by changing the number of periods, adjusting the barriers height as well as modifying the barriers and wells width it is possible to identify the contribution of Fano resonances on the conductance. Particularly, the coupling of Fano resonances with the intrinsic minibands of the superlattice gives rise to specific and identifiable changes in the conductance. Moreover, by reducing the angular range for the computation of the transport properties it is possible to obtain conductance curves with line-shapes quite similar to the Fano profile and the coupling profile between Fano resonance and miniband states. In fact, these conductance features could serve as unequivocal characteristic of the existence of Fano resonances in bilayer graphene.
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11
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Thakkar N, Rea MT, Smith KC, Heylman KD, Quillin SC, Knapper KA, Horak EH, Masiello DJ, Goldsmith RH. Sculpting Fano Resonances To Control Photonic-Plasmonic Hybridization. NANO LETTERS 2017; 17:6927-6934. [PMID: 28968499 DOI: 10.1021/acs.nanolett.7b03332] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Hybrid photonic-plasmonic systems have tremendous potential as versatile platforms for the study and control of nanoscale light-matter interactions since their respective components have either high-quality factors or low mode volumes. Individual metallic nanoparticles deposited on optical microresonators provide an excellent example where ultrahigh-quality optical whispering-gallery modes can be combined with nanoscopic plasmonic mode volumes to maximize the system's photonic performance. Such optimization, however, is difficult in practice because of the inability to easily measure and tune critical system parameters. In this Letter, we present a general and practical method to determine the coupling strength and tailor the degree of hybridization in composite optical microresonator-plasmonic nanoparticle systems based on experimentally measured absorption spectra. Specifically, we use thermal annealing to control the detuning between a metal nanoparticle's localized surface plasmon resonance and the whispering-gallery modes of an optical microresonator cavity. We demonstrate the ability to sculpt Fano resonance lineshapes in the absorption spectrum and infer system parameters critical to elucidating the underlying photonic-plasmonic hybridization. We show that including decoherence processes is necessary to capture the evolution of the lineshapes. As a result, thermal annealing allows us to directly tune the degree of hybridization and various hybrid mode quantities such as the quality factor and mode volume and ultimately maximize the Purcell factor to be 104.
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Affiliation(s)
- Niket Thakkar
- Department of Applied Mathematics, University of Washington , Seattle, Washington 98195-3925, United States
| | - Morgan T Rea
- Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706-1322, United States
| | - Kevin C Smith
- Department of Physics, University of Washington , Seattle, Washington 98195-1560, United States
| | - Kevin D Heylman
- Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706-1322, United States
| | - Steven C Quillin
- Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States
| | - Kassandra A Knapper
- Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706-1322, United States
| | - Erik H Horak
- Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706-1322, United States
| | - David J Masiello
- Department of Applied Mathematics, University of Washington , Seattle, Washington 98195-3925, United States
- Department of Chemistry, University of Washington , Seattle, Washington 98195-1700, United States
| | - Randall H Goldsmith
- Department of Chemistry, University of Wisconsin-Madison , Madison, Wisconsin 53706-1322, United States
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12
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Dana B, Bahabad A. Double Fano resonance in a plasmonic double grating structure. OPTICS EXPRESS 2016; 24:22334-22344. [PMID: 27828305 DOI: 10.1364/oe.24.022334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
It is shown theoretically and numerically that a simple gratings-based plasmonic structure can support a nearly-degenerate double Fano resonance which can lead to a relatively narrow spectral line shape. The double-resonance spectral location and line-shape are controllable by either adjusting the periodicity and unit-cell of the gratings or by adjusting the angle of incidence of the incoming radiation.
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13
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Zielinski A, Majety VP, Nagele S, Pazourek R, Burgdörfer J, Scrinzi A. Anomalous Fano Profiles in External Fields. PHYSICAL REVIEW LETTERS 2015; 115:243001. [PMID: 26705629 DOI: 10.1103/physrevlett.115.243001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Indexed: 06/05/2023]
Abstract
We show that the external control of Fano resonances in general leads to complex Fano q parameters. Fano line shapes of photoelectron and transient absorption spectra in the presence of an infrared control field are investigated. Computed transient absorption spectra are compared with a model proposed for a recent experiment [C. Ott et al., Science 340, 716 (2013)]. Control mechanisms for photoelectron spectra are exposed: control pulses applied during excitation modify the line shapes by momentum boosts of the continuum electrons. Pulses arriving after excitation generate interference fringes due to infrared two-photon transitions.
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Affiliation(s)
| | | | - Stefan Nagele
- Institute for Theoretical Physics, Vienna University of Technology, 1040 Vienna, Austria
| | - Renate Pazourek
- Institute for Theoretical Physics, Vienna University of Technology, 1040 Vienna, Austria
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Joachim Burgdörfer
- Institute for Theoretical Physics, Vienna University of Technology, 1040 Vienna, Austria
| | - Armin Scrinzi
- Physics Department, Ludwig Maximilians Universität, D-80333 Munich, Germany
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14
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Heeg KP, Ott C, Schumacher D, Wille HC, Röhlsberger R, Pfeifer T, Evers J. Interferometric phase detection at x-ray energies via Fano resonance control. PHYSICAL REVIEW LETTERS 2015; 114:207401. [PMID: 26047250 DOI: 10.1103/physrevlett.114.207401] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Indexed: 06/04/2023]
Abstract
Modern x-ray light sources promise access to structure and dynamics of matter in largely unexplored spectral regions. However, the desired information is encoded in the light intensity and phase, whereas detectors register only the intensity. This phase problem is ubiquitous in crystallography and imaging and impedes the exploration of quantum effects at x-ray energies. Here, we demonstrate phase-sensitive measurements characterizing the quantum state of a nuclear two-level system at hard x-ray energies. The nuclei are initially prepared in a superposition state. Subsequently, the relative phase of this superposition is interferometrically reconstructed from the emitted x rays. Our results form a first step towards x-ray quantum state tomography and provide new avenues for structure determination and precision metrology via x-ray Fano interference.
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Affiliation(s)
- K P Heeg
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
| | - C Ott
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
| | - D Schumacher
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - H-C Wille
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - R Röhlsberger
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - T Pfeifer
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
| | - J Evers
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
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15
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Morfonios C, Schmelcher P. Current control by resonance decoupling and magnetic focusing in soft-wall billiards. PHYSICAL REVIEW LETTERS 2014; 113:086802. [PMID: 25192118 DOI: 10.1103/physrevlett.113.086802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Indexed: 06/03/2023]
Abstract
The isolation of energetically persistent scattering pathways from the resonant manifold of an open electron billiard in the deep quantum regime is demonstrated. This enables efficient conductance switching at varying temperature and Fermi velocity, using a weak magnetic field. The effect relies on the interplay between magnetic focusing and soft-wall confinement, which rescale the scattering pathways and decouple quasibound states from the attached leads, the field-free motion being forwardly collimated. The mechanism proves robust against billiard shape variations and qualifies as a nanoelectronic current control element.
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Affiliation(s)
- C Morfonios
- Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - P Schmelcher
- Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany and The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
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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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Vasco JP, Vinck-Posada H, Valentim PT, Guimãraes PSS. Modeling of Fano resonances in the reflectivity of photonic crystal cavities with finite spot size excitation. OPTICS EXPRESS 2013; 21:31336-31346. [PMID: 24514709 DOI: 10.1364/oe.21.031336] [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
We study the reflectivity spectra of photonic crystal slab cavities using an extension of the scattering matrix method that allows treating finite sizes of the spot of the excitation beam. The details of the implementation of the method are presented and then we show that Fano resonances arise as a consequence of the electromagnetic interference between the discrete contribution of the fundamental cavity mode and the continuum contribution of the light scattered by the photonic crystal pattern. We control the asymmetry lineshape of the Fano resonance through the polarization of the incident field, which determines the relative phase between the two electromagnetic contributions to the interference. We analyse the electric field profile inside and outside of the crystal to help in the understanding of the dependence on polarization of the reflectivity lineshape. We also study with our implementation the dependence of the Fano resonances on the size of the incident radiation spot.
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Lackner F, Březinová I, Burgdörfer J, Libisch F. Semiclassical wave functions for open quantum billiards. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:022916. [PMID: 24032910 DOI: 10.1103/physreve.88.022916] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Indexed: 06/02/2023]
Abstract
We present a semiclassical approximation to the scattering wave function Ψ(r,k) for an open quantum billiard, which is based on the reconstruction of the Feynman path integral. We demonstrate its remarkable numerical accuracy for the open rectangular billiard and show that the convergence of the semiclassical wave function to the full quantum state is controlled by the mean path length or equivalently the dwell time for a given scattering state. In the numerical implementation a cutoff length in the maximum path length or, equivalently, a maximum dwell time τ(max) included implies a finite energy resolution ΔE~τ(max)(-1). Possible applications include leaky billiards and systems with decoherence present.
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Affiliation(s)
- Fabian Lackner
- Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10/136, 1040 Vienna, Austria, EU
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Laskar JM, Raj B, Philip J. Enhanced transmission with tunable Fano-like profile in magnetic nanofluids. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2011; 84:051403. [PMID: 22181413 DOI: 10.1103/physreve.84.051403] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2011] [Revised: 07/27/2011] [Indexed: 05/31/2023]
Abstract
We observe a Fano-like resonance in a magnetically polarizable nanofluid. Under an external magnetic field, the transmittance spectrum of a ferrofluid emulsion containing droplet size of ~220 nm shows an enhanced peak with a Fano-like profile, which is attributed to a localized waveguide resonance from random array of tubes with charged inner surface that are formed by the alignment of the droplets. Furthermore, by varying the magnetic field, the Fano profile is tuned and an opaque emulsion is turned into a transparent one. This finding may have interesting applications in tunable photonic devices.
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Affiliation(s)
- Junaid M Laskar
- SMARTS, Metallurgy and Materials Group Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu, India
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Babić L, de Dood MJA. Interpretation of Fano lineshape reversal in the reflectivity spectra of photonic crystal slabs. OPTICS EXPRESS 2010; 18:26569-26582. [PMID: 21165007 DOI: 10.1364/oe.18.026569] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Resonant coupling of light to leaky modes of a photonic crystal slab leads to asymmetric Fano lineshapes in the reflectivity spectra. The generally accepted picture, for a lossless system, is that the sign of the real-valued parameter q controls the asymmetry of a Fano resonance. For the reflectivity of a symmetric slab this situation occurs if the amplitude reflection coefficient of the slab goes through zero. In this article, we show that it is also possible to change the asymmetry of a resonance by angle tuning without reaching a condition of zero amplitude. Moreover, we show that the picture of a real-valued parameter q that controls the asymmetry is incomplete.
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Affiliation(s)
- Lj Babić
- Huygens Laboratory, Leiden University, PO Box 9504, 2300 RA Leiden, The Netherlands
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