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Seçkin S, Singh P, Jaiswal A, König TAF. Super-Radiant SERS Enhancement by Plasmonic Particle Gratings. ACS APPLIED MATERIALS & INTERFACES 2023; 15:43124-43134. [PMID: 37665350 DOI: 10.1021/acsami.3c07532] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/05/2023]
Abstract
Despite recent developments, surface-enhanced Raman spectroscopy (SERS) applications face challenges in achieving both high sensitivity and uniform Raman signals over a large area. Using the directional self-assembly of plasmonic nanoparticles in lattice structures, we show how one can increase the SERS signal 43-fold over randomly aligned gold nanoparticles without relying on the photoluminescence of Rhodamine 6G. For this study, we have chosen the lattice constant for an off-resonant case that matches the lattice resonance and super-radiant plasmon mode along the particle chain. Supported by electromagnetic simulations, we systematically analyze the radiative components of the plasmon modes by varying the particle size while keeping the lattice periodicity constant. We perform polarization-dependent SERS measurements and compare them with other standard SERS excitation wavelengths. Using the self-assembled plasmonic particle lattice, we have developed an effective SERS substrate that provides a significantly higher signal with 73% less surface coverage. This colloidal approach enables the cost-effective and scalable fabrication of highly sensitive, uniform, and polarization-dependent SERS substrates.
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Affiliation(s)
- Sezer Seçkin
- Leibniz-Institut für Polymerforschung e.V., Hohe Straße 6, Dresden 01069 ,Germany
| | - Prem Singh
- School of Biosciences and Bioengineering, Indian Institute of Technology - Mandi, Kamand, Mandi, Himachal Pradesh 175075, India
| | - Amit Jaiswal
- School of Biosciences and Bioengineering, Indian Institute of Technology - Mandi, Kamand, Mandi, Himachal Pradesh 175075, India
| | - Tobias A F König
- Leibniz-Institut für Polymerforschung e.V., Hohe Straße 6, Dresden 01069 ,Germany
- Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, Helmholtzstraße 18, Dresden01069 ,Germany
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Bergstraße 66, Dresden01069 ,Germany
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2
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Aftenieva O, Brunner J, Adnan M, Sarkar S, Fery A, Vaynzof Y, König TAF. Directional Amplified Photoluminescence through Large-Area Perovskite-Based Metasurfaces. ACS NANO 2023; 17:2399-2410. [PMID: 36661409 PMCID: PMC9955732 DOI: 10.1021/acsnano.2c09482] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 01/13/2023] [Indexed: 06/17/2023]
Abstract
Perovskite nanocrystals are high-performance, solution-processed materials with a high photoluminescence quantum yield. Due to these exceptional properties, perovskites can serve as building blocks for metasurfaces and are of broad interest for photonic applications. Here, we use a simple grating configuration to direct and amplify the perovskite nanocrystals' original omnidirectional emission. Thus far, controlling these radiation properties was only possible over small areas and at a high expense, including the risks of material degradation. Using a soft lithographic printing process, we can now reliably structure perovskite nanocrystals from the organic solution into light-emitting metasurfaces with high contrast on a large area. We demonstrate the 13-fold amplified directional radiation with an angle-resolved Fourier spectroscopy, which is the highest observed amplification factor for the perovskite-based metasurfaces. Our self-assembly process allows for scalable fabrication of gratings with predefined periodicities and tunable optical properties. We further show the influence of solution concentration on structural geometry. By increasing the perovskite concentration 10-fold, we can produce waveguide structures with a grating coupler in one printing process. We analyze our approach with numerical modeling, considering the physiochemical properties to obtain the desired geometry. This strategy makes the tunable radiative properties of such perovskite-based metasurfaces usable for nonlinear light-emitting devices and directional light sources.
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Affiliation(s)
- Olha Aftenieva
- Leibniz-Institut
für Polymerforschung e.V., Hohe Straße 6, 01069Dresden, Germany
| | - Julius Brunner
- Integrated
Centre for Applied Physics and Photonic Materials and Centre for Advancing
Electronics Dresden (cfaed), Technical University
of Dresden, Nöthnitzer Straße 61, 01187Dresden, Germany
| | - Mohammad Adnan
- Leibniz-Institut
für Polymerforschung e.V., Hohe Straße 6, 01069Dresden, Germany
| | - Swagato Sarkar
- Leibniz-Institut
für Polymerforschung e.V., Hohe Straße 6, 01069Dresden, Germany
| | - Andreas Fery
- Leibniz-Institut
für Polymerforschung e.V., Hohe Straße 6, 01069Dresden, Germany
- Physical
Chemistry of Polymeric Materials, Technische
Universität Dresden, Bergstraße 66, 01069Dresden, Germany
| | - Yana Vaynzof
- Integrated
Centre for Applied Physics and Photonic Materials and Centre for Advancing
Electronics Dresden (cfaed), Technical University
of Dresden, Nöthnitzer Straße 61, 01187Dresden, Germany
- Center
for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, 01062Dresden, Germany
| | - Tobias A. F. König
- Leibniz-Institut
für Polymerforschung e.V., Hohe Straße 6, 01069Dresden, Germany
- Center
for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, 01062Dresden, Germany
- Faculty of
Chemistry and Food Chemistry, Technische
Universität Dresden, Bergstraße 66, 01069Dresden, Germany
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Papadopoulos AN. Nanotechnology and Wood Science. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:691. [PMID: 36839059 PMCID: PMC9966417 DOI: 10.3390/nano13040691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 02/09/2023] [Indexed: 06/18/2023]
Abstract
Nanotechnology, in a sense, is not entirely a new concept [...].
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Affiliation(s)
- Antonios N Papadopoulos
- Laboratory of Wood Chemistry and Technology, Department of Forestry and Natural Environment, International Hellenic University, GR-661 00 Drama, Greece
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Scattolo E, Cian A, Petti L, Lugli P, Giubertoni D, Paternoster G. Near Infrared Efficiency Enhancement of Silicon Photodiodes by Integration of Metal Nanostructures Supporting Surface Plasmon Polaritrons. SENSORS (BASEL, SWITZERLAND) 2023; 23:856. [PMID: 36679653 PMCID: PMC9860920 DOI: 10.3390/s23020856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 01/06/2023] [Accepted: 01/08/2023] [Indexed: 06/17/2023]
Abstract
Recent years have witnessed a growing interest in detectors capable of detecting single photons in the near-infrared (NIR), mainly due to the emergence of new applications such as light detection and ranging (LiDAR) for, e.g., autonomous driving. A silicon single-photon avalanche diode is surely one of the most interesting and available technologies, although it yields a low efficiency due to the low absorption coefficient of Si in the NIR. Here, we aim at overcoming this limitation through the integration of complementary metal-oxide-semiconductor (CMOS) -compatible nanostructures on silicon photodetectors. Specifically, we utilize silver grating arrays supporting surface plasmons polaritons (SPPs) to superficially confine the incoming NIR photons and therefore to increase the probability of photons generating an electron-hole pair. First, the plasmonic silver array is geometrically designed using time domain simulation software to achieve maximum detector performance at 950 nm. Then, a plasmonic silver array characterized by a pitch of 535 nm, a dot width of 428 nm, and a metal thickness of 110 nm is integrated by means of the focused ion beam technique on the detector. Finally, the integrated detector is electro-optically characterized, demonstrating a QE of 13% at 950 nm, 2.2 times higher than the reference. This result suggests the realization of a silicon device capable of detecting single NIR photons, at a low cost and with compatibility with standard CMOS technology platforms.
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Affiliation(s)
- Elia Scattolo
- Sensors and Devices Center, Bruno Kessler Foundation, I-38123 Trento, Italy
- Faculty of Science and Technology, Free University of Bozen, 39100 Bolzano, Italy
| | - Alessandro Cian
- Faculty of Science and Technology, Free University of Bozen, 39100 Bolzano, Italy
| | - Luisa Petti
- Sensors and Devices Center, Bruno Kessler Foundation, I-38123 Trento, Italy
| | - Paolo Lugli
- Sensors and Devices Center, Bruno Kessler Foundation, I-38123 Trento, Italy
| | - Damiano Giubertoni
- Faculty of Science and Technology, Free University of Bozen, 39100 Bolzano, Italy
| | - Giovanni Paternoster
- Faculty of Science and Technology, Free University of Bozen, 39100 Bolzano, Italy
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Loiko NA, Miskevich AA, Loiko VA. Resonant absorption of light by a two-dimensional imperfect lattice of spherical particles. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2022; 39:C36-C44. [PMID: 36520721 DOI: 10.1364/josaa.469733] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Accepted: 09/28/2022] [Indexed: 06/17/2023]
Abstract
The light absorption and scattering by an infinite two-dimensional array with an imperfect lattice of identical spherical particles is considered based on the statistical approach to a description of electromagnetic wave interaction with particulate media. Absorption resonances due to the coherent component of scattered light (zeroth order of diffraction) and resonances arising from the excitation of a flux of incoherently scattered light (higher diffraction orders) propagating at grazing angles to the array plane are studied. The dependence of absorption on the degree of positional ordering of particles is considered. It is shown that with an increase in ordering, the spatial coherence of the light flux along the array plane increases and the absorption resonance becomes more pronounced. Data are presented for silver wavelength-sized particles for s- and p-polarized incident waves. It is shown that at small angles of incidence, the first diffraction order can arise at the wavelength of zeroth-order resonance. In this case, the contributions to absorption created by the coherent and incoherent components of scattered light are summed up. The value of the absorption coefficient can be close to 0.95. A comparison with data for a partially ordered array is carried out.
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Plasmon resonance of gold and silver nanoparticle arrays in the Kretschmann (attenuated total reflectance) vs. direct incidence configuration. Sci Rep 2022; 12:15738. [PMID: 36130995 PMCID: PMC9492765 DOI: 10.1038/s41598-022-20117-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 09/08/2022] [Indexed: 11/16/2022] Open
Abstract
While the behaviour of plasmonic solid thin films in the Kretschmann (also known as Attenuated Total Reflection, ATR) configuration is well-understood, the use of discrete nanoparticle arrays in this optical configuration is not thoroughly explored. It is important to do so, since close packed plasmonic nanoparticle arrays exhibit exceptionally strong light-matter interactions by plasmonic coupling. The present work elucidates the optical properties of plasmonic Au and Ag nanoparticle arrays in both the direct normal incidence and Kretschmann configuration by numerical models, that are validated experimentally. First, hexagonal close packed Au and Ag nanoparticle films/arrays are obtained by air–liquid interfacial assembly. The numerical models for the rigorous solution of the Maxwell’s equations are validated using experimental optical spectra of these films before systematically investigating various parameters. The individual far-field/near-field optical properties, as well as the plasmon relaxation mechanism of the nanoparticles, vary strongly as the packing density of the array increases. In the Kretschmann configuration, the evanescent fields arising from p- and s-polarized (or TM and TE polarized) incidence have different directional components. The local evanescent field intensity and direction depends on the polarization, angle of incidence and the wavelength of incidence. These factors in the Kretschmann configuration give rise to interesting far-field as well as near-field optical properties. Overall, it is shown that plasmonic nanoparticle arrays in the Kretschmann configuration facilitate strong broadband absorptance without transmission losses, and strong near-field enhancement. The results reported herein elucidate the optical properties of self-assembled nanoparticle films, pinpointing the ideal conditions under which the normal and the Kretschmann configuration can be exploited in multiple light-driven applications.
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Feng YJ, Simbulan KB, Yang TH, Chen YR, Li KS, Chu CJ, Lu TH, Lan YW. Twisted Light-Induced Photocurrent in a Silicon Nanowire Field-Effect Transistor. ACS NANO 2022; 16:9297-9303. [PMID: 35713188 DOI: 10.1021/acsnano.2c01944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Light can possess orbital angular momentum (OAM), in addition to spin angular momentum (SAM), which offers nearly infinite possible values of momentum states, allowing a wider degree of freedom for information processing and communications. The OAM of light induces a selection rule that obeys the law of conservation of angular momentum as it interacts with a material, affecting the material's optical and electrical properties. In this work, silicon nanowire field-effect transistors are subjected to light with OAM, also known as twisted light. Electrical measurements on the devices consequently reveal photocurrent enhancements after incrementing the OAM of the incident light from 0ℏ (fundamental mode) to 5ℏ. Such a phenomenon is attributed to the enhancements of the photogating and the photoconductive effects under the influence of the OAM of light, the underlying mechanism of which is proposed and discussed using energy band diagrams. With these observations, a strategy for controlling photocurrent has been introduced, which can be a realization of the application in the field of optoelectronics technology.
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Affiliation(s)
- Yi-Jie Feng
- Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Kristan Bryan Simbulan
- Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
- Department of Mathematics and Physics, University of Santo Tomas, Manila 1008, Philippines
| | - Tilo H Yang
- Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Ye-Ru Chen
- Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Kai-Shin Li
- Taiwan Semiconductor Research Institute, National Applied Research Laboratories, Hsinchu 30078, Taiwan
| | - Chia-Jung Chu
- Silicon Based Molecular Sensoring Technology CO., Ltd. (Molsentech), Taipei 11571, Taiwan
| | - Ting-Hua Lu
- Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Yann-Wen Lan
- Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
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Densely Distributed Multiple Resonance Modes in a Fan-Shaped Plasmonic Nanostructure Demonstrated by FEM Simulations. NANOMATERIALS 2019; 9:nano9070975. [PMID: 31277376 PMCID: PMC6669990 DOI: 10.3390/nano9070975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Revised: 06/24/2019] [Accepted: 06/26/2019] [Indexed: 11/30/2022]
Abstract
Multiple resonance modes have important applications since they can provide multi-frequency operation for devices and bring great flexibility in practice. In this paper, based on a fan-shaped cavity coupled to a metal-isolator-metal (MIM) waveguide, a new kind of ultracompact plasmonic nanostructure is proposed to realize multiple resonance modes with dense distribution in a broad spectral range, and demonstrated through finite-element method (FEM) simulations. As many as ten resonance modes with an average interval of about 30 nm are obtained. They originate from the coexistence and interference of three types of basic modes in the fan-shaped cavity, i.e., the ring-waveguide modes, the modes in a ring array of periodic air grooves, and the metal-core-cavity modes. The dependence of resonance modes on structure parameters is investigated, which can provide an effective guide for choosing appropriate multiple-resonance-mode structures. Furthermore, by means of adjusting the geometrical asymmetry induced by the axial offset of the metal core in the fan-shaped cavity, the resonance modes can be effectively modulated, and some new modes appear because the wave path in the cavity is changed. The result proposes a novel way to create multiple resonance modes in plasmonic nanostructures, providing additional degrees of freedom for tailoring the resonance spectra and promising applications in various plasmonic devices, such as optical filters, ultrafast switches, biochemical sensors, and data storages.
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Linearly Tunable Fano Resonance Modes in a Plasmonic Nanostructure with a Waveguide Loaded with Two Rectangular Cavities Coupled by a Circular Cavity. NANOMATERIALS 2019; 9:nano9050678. [PMID: 31052439 PMCID: PMC6566631 DOI: 10.3390/nano9050678] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Revised: 04/23/2019] [Accepted: 04/24/2019] [Indexed: 11/16/2022]
Abstract
Linear tunability has important applications since it can be realized by using linear control voltage and can be used conveniently without requiring nonlinear scale. In this paper, a kind of plasmonic nanostructure with a waveguide loaded with two rectangular cavities coupled by a circular cavity is proposed to produce four Fano resonance modes. The transfer matrix theory is employed to analyze the coupled-waveguide-cavity system. By analyzing the property of each single cavity, it reveals that the Fano resonances are originated from the coupling effect of the narrow modes in the metal-core circular cavity and the broad modes in the rectangular cavities. Owing to the interference of different modes, Fano peaks have different sensitivities on the cavity parameters, which can provide important guidance for designing Fano-resonance structures. Furthermore, adjusting the orientation angle of the metal core in the circular cavity can easily tune the line profile of Fano resonance modes in the structure. Especially, the figure of merit (FoM) increases linearly with the orientation angle and has a maximum of 8056. The proposed plasmonic system has the advantage of high transmission, ultracompact configuration, and easy integration, which can be applied in biochemical detecting or sensing, ultra-fast switching, slow-light technologies, and so on.
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Papadopoulos AN, Bikiaris DN, Mitropoulos AC, Kyzas GZ. Nanomaterials and Chemical Modifications for Enhanced Key Wood Properties: A Review. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E607. [PMID: 31013808 PMCID: PMC6523757 DOI: 10.3390/nano9040607] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 03/23/2019] [Accepted: 04/05/2019] [Indexed: 12/18/2022]
Abstract
This work briefly reviews the research milestones in the area of wood chemical modification, focusing on acetylated and furfurylated wood which have been scaled up, and exploits the solutions that nanotechnology can offer to wood protection as an alternative green innovative approach in improving key wood properties, namely the dimensional stability when subjected to a fluctuating moisture content and a susceptibility to biodegradability by microorganisms. Recently, nanomaterials were found to be able applicable in wood science. The target is to improve some special physicochemical characteristics of wood in order to resist extreme conditions (climate, bacteria, etc.), giving an enhanced potentiality. It is well-established that the wood cell wall shows a porosity of molecular scale dimensions; this is caused by the partial filling of spaces between the microfibrils of the cellulose mainly by polyoses and lignin. The small-sized nanoparticles can deeply and effectively penetrate into the wood, altering its surface chemistry, improving its properties, and therefore, resulting in a hyper-performance product.
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Affiliation(s)
- Antonios N Papadopoulos
- Laboratory of Wood Chemistry and Technology, Eastern Macedonia and Thrace Institute of Technology, GR-661 00 Drama, Greece.
| | - Dimitrios N Bikiaris
- Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece.
| | - Athanasios C Mitropoulos
- Hephaestus Advanced Laboratory, Eastern Macedonia and Thrace Institute of Technology, GR-654 04 Kavala, Greece.
| | - George Z Kyzas
- Hephaestus Advanced Laboratory, Eastern Macedonia and Thrace Institute of Technology, GR-654 04 Kavala, Greece.
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Shen S, Gao M, Ban R, Chen H, Wang X, Qian L, Li J, Yang Z. Spatially-Controllable Hot Spots for Plasmon-Enhanced Second-Harmonic Generation in AgNP-ZnO Nanocavity Arrays. NANOMATERIALS 2018; 8:nano8121012. [PMID: 30563152 PMCID: PMC6316233 DOI: 10.3390/nano8121012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 12/03/2018] [Accepted: 12/04/2018] [Indexed: 11/16/2022]
Abstract
Plasmon-enhanced second-harmonic generation (PESHG) based on hybrid metal-dielectric nanostructures have extraordinary importance for developing efficient nanoscale nonlinear sources, which pave the way for new applications in photonic circuitry, quantum optics, and biosensors. However, the relatively high loss of excitation energies and the low spatial overlapping between the locally enhanced electromagnetic field and nonlinear materials still limit the promotion of nonlinear conversion performances in such hybrid systems. Here, we design and fabricate an array of silver nanoparticle-ZnO (AgNP-ZnO) nanocavities to serve as an efficient PESHG platform. The geometry of AgNP-ZnO nanocavity arrays provides a way to flexibly modulate hot spots in three-dimensional space, and to achieve a good mutual overlap of hot spots and ZnO material layers for realizing efficient SH photon generation originating from ZnO nanocavities. Compared to bare ZnO nanocavity arrays, the resulting hybrid AgNP-ZnO design of nanocavities reaches the maximum PESHG enhancement by a factor of approximately 31. Validated by simulations, we can further interpret the relative contribution of fundamental and harmonic modes to Ag-NP dependent PESHG performances, and reveal that the enhancement stems from the co-cooperation effect of plasmon-resonant enhancements both for fundamental and harmonic frequencies. Our findings offer a previously unreported method for designing efficient PESHG systems and pave a way for further understanding of a surface plasmon-coupled second-order emission mechanism for the enhancement of hybrid systems.
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Affiliation(s)
- Shaoxin Shen
- Department of Physics, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen University, Xiamen 361005, China.
- College of Information Science and Engineering, Fujian Provincial Key Laboratory of Light Propagation and Transformation, Huaqiao University, Xiamen 361021, China.
| | - Min Gao
- Department of Physics, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen University, Xiamen 361005, China.
| | - Rongcheng Ban
- Department of Physics, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen University, Xiamen 361005, China.
| | - Huiyu Chen
- Department of Physics, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen University, Xiamen 361005, China.
| | - Xiangjie Wang
- Department of Physics, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen University, Xiamen 361005, China.
| | - Lihua Qian
- School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Jing Li
- Department of Physics, Pen-Tung Sah Micro-Nano Institute of Science and Technology, Xiamen University, Xiamen 361005, China.
| | - Zhilin Yang
- Department of Physics, Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Xiamen University, Xiamen 361005, China.
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