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Liu Y, Gui L, Xu K. Enhancement of second-harmonic generation from Fano plasmonic metasurfaces by introducing structural asymmetries. OPTICS EXPRESS 2022; 30:42440-42453. [PMID: 36366698 DOI: 10.1364/oe.469129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
Resonant plasmonic metasurfaces have attracted much attention for great potential in augmenting nonlinear optical conversion at the nanoscale and thus related sensing and integrated optics applications. In this work, we use the nonlinear scattering theory to numerically investigate enhanced second-harmonic generation (SHG) from Fano metasurfaces which consist of gold asymmetric double-bars. We find that the Fano resonance at the fundamental wavelength boosts the nonlinear response by more than a factor of 60. On this basis, by introducing translational and rotational structural asymmetries, the SHG signal is further amplified because of the broken mirror symmetry. More specifically, under the optimal condition, the previously suppressed SHG component can be greatly released and play a more important role compared to the original existing SHG component in an extra 6-fold enhancement in total SHG intensity. The 360-fold enhancement by tailoring both resonance quality and structural asymmetries indicates the clear and important roles of both linear resonance and local-field distribution in reaching the largest SHG emission. Our results are a step towards enlarging SHG responses of more complex plasmonic nanostructures.
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Leon UA, Rocco D, Carletti L, Peccianti M, Maci S, Della Valle G, De Angelis C. THz-photonics transceivers by all-dielectric phonon-polariton nonlinear nanoantennas. Sci Rep 2022; 12:4590. [PMID: 35301395 PMCID: PMC8931019 DOI: 10.1038/s41598-022-08695-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 03/08/2022] [Indexed: 11/09/2022] Open
Abstract
The THz spectrum (spanning from 0.3 to 30 THz) offers the potential of a plethora of applications, ranging from the imaging through non transparent media to wireless-over-fiber communications and THz-photonics. The latter framework would greatly benefit from the development of optical-to-THz wavelength converters. Exploiting Difference Frequency Generation in a nonlinear all dielectric nanoantenna, we propose a compact solution to this problem. By means of a near-infrared pump beam (at \documentclass[12pt]{minimal}
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\begin{document}$$\omega _1$$\end{document}ω1), the information signal in the optical domain (at \documentclass[12pt]{minimal}
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\begin{document}$$\omega _2$$\end{document}ω2) is converted to the THz band (at \documentclass[12pt]{minimal}
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\begin{document}$$\omega _3=\omega _2-\omega _1$$\end{document}ω3=ω2-ω1). The approach is completely transparent with respect to the modulation format, and can be easily integrated in a metasurface platform for simultaneous frequency and spatial moulding of THz beams.
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Affiliation(s)
- Unai Arregui Leon
- Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milan, Italy
| | - Davide Rocco
- Department of Information Engineering, University of Brescia, via Branze 38, 25123, Brescia, Italy. .,National Institute of Optics, Consiglio Nazionale delle Ricerche, via Branze 45, 25123, Brescia, Italy.
| | - Luca Carletti
- Department of Information Engineering, University of Brescia, via Branze 38, 25123, Brescia, Italy.,National Institute of Optics, Consiglio Nazionale delle Ricerche, via Branze 45, 25123, Brescia, Italy
| | - Marco Peccianti
- Emergent Photonics Lab (EPic), Department of Physics and Astronomy, University of Sussex, Brighton, BN1 9QH, UK
| | - Stefano Maci
- Department of Information Engineering and Mathematics, University of Siena, 53100, Siena, Italy
| | - Giuseppe Della Valle
- Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milan, Italy.,Institute for Photonics and Nanotechnologies, Consiglio Nazionale delle Ricerche, Piazza Leonardo da Vinci 32, Milan, 20133, Italy
| | - Costantino De Angelis
- Department of Information Engineering, University of Brescia, via Branze 38, 25123, Brescia, Italy.,National Institute of Optics, Consiglio Nazionale delle Ricerche, via Branze 45, 25123, Brescia, Italy
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Zhou T, Ding SJ, Wu ZY, Yang DJ, Zhou LN, Zhao ZR, Ma L, Wang W, Ma S, Wang SM, Zou JN, Zhou L, Wang QQ. Synthesis of AuAg/Ag/Au open nanoshells with optimized magnetic plasmon resonance and broken symmetry for enhancing second-harmonic generation. NANOSCALE 2021; 13:19527-19536. [PMID: 34806104 DOI: 10.1039/d1nr04814g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The cooperation of magnetic and electric plasmon resonances in cup-shaped metallic nanostructures exhibits significant capability for second-harmonic generation (SHG) enhancement. Herein, we report an approach for synthesizing Au open nanoshells with tunable numbers and sizes of openings on a template of six-pointed PbS nanostars. The morphology of Au nanoshells is controlled by adjusting the amount of HAuCl4, and the characteristic shapes of pointed nanocaps, open nanoshells, and hollow nanostars are obtained. Owing to the collaboration of electric and magnetic plasmon resonance modes, the Au nanoshells exhibit significantly broadened and highly tunable optical responses. Furthermore, the morphology-dependent SHG of the Au nanoshells shows two maximal SHG intensities, corresponding to four-opening and one-opening Au nanoshells with appropriate opening sizes. Ag/Au and AuAg/Ag/Au open nanoshells were further investigated to achieve enhanced SHG. By adjusting the thickness of the Ag shell, the SHG intensity of Ag/Au open nanoshells reaches a maximum due to the gradient field at the AuAg bimetallic interface. After replacing the Ag shells with Au shells, the SHG intensity of AuAg/Ag/Au open nanoshells reaches a maximum due to further symmetry breaking. These findings provide a strategy to prepare colloidal metal nanocrystals with prospective applications ranging from nonlinear photonic nanodevices to biospectroscopy and photocatalysis.
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Affiliation(s)
- Tao Zhou
- School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, China.
| | - Si-Jing Ding
- School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, China.
| | - Zhi-Yong Wu
- Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education, Wuhan University, Wuhan 430072, China.
| | - Da-Jie Yang
- Mathematics and Physics Department, North China Electric Power, University, Beijing 102206, China
| | - Li-Na Zhou
- School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, China.
| | - Zhi-Rui Zhao
- School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, China.
| | - Liang Ma
- Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, China.
| | - Wei Wang
- Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education, Wuhan University, Wuhan 430072, China.
| | - Song Ma
- Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education, Wuhan University, Wuhan 430072, China.
| | - Si-Man Wang
- Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education, Wuhan University, Wuhan 430072, China.
| | - Jia-Nan Zou
- Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education, Wuhan University, Wuhan 430072, China.
| | - Li Zhou
- Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education, Wuhan University, Wuhan 430072, China.
| | - Qu-Quan Wang
- Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education, Wuhan University, Wuhan 430072, China.
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Qin Z, Chen H, Hu T, Zhang M, Chen Z, Wang Z. Enhanced second-harmonic generation from gold complementary split-ring resonators with a dielectric coating. OPTICS EXPRESS 2021; 29:15269-15278. [PMID: 33985229 DOI: 10.1364/oe.424412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 04/26/2021] [Indexed: 06/12/2023]
Abstract
We experimentally and theoretically investigate the influence of alumina coating on the second-harmonic generation (SHG) from split-ring resonator shaped air apertures engraved in a gold film, which are also termed as complementary split-ring resonators (CSRRs). By coating the CSRR arrays with alumina film of certain thickness, we precisely tune their electric diploe resonances (EDRs) to overlap the fundamental wavelength (FW) and realize the EDR enhanced SHG process. On this basis, by shortening the arm length of the CSRRs and then coating them with a certain thickness of the alumina film, we have achieved an SHG enhancement of nearly 1.2-fold in experiment and 8-fold in simulation compared to the CSRR array with an unshortened arm length. We attributed it to the improvement of the magnitude of the effective nonlinear source due to the realization of a doubly-resonant condition. As a flexible method, dielectric coating not only is beneficial to precisely and dynamically optimize the linear and nonlinear properties of the as-fabricated nanoscale devices but also can play the role of a protective layer, which can partially improve the damage threshold of these plasmonic nanoscale devices.
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Haddadnezhad M, Yoo S, Kim J, Kim JM, Son J, Jeong HS, Park D, Nam JM, Park S. Synthesis and Surface Plasmonic Characterization of Asymmetric Au Split Nanorings. NANO LETTERS 2020; 20:7774-7782. [PMID: 32914988 DOI: 10.1021/acs.nanolett.0c03385] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this Letter, a rational and stepwise method for the solution-phase synthesis of asymmetric Au split nanorings by adopting Au nanoprisms as a template has been demonstrated. The selective chemical etching of Au nanoprism tips activated the surface reactivity of edges and led to the selective deposition of Pt at the periphery of Au nanoplates. By controlling the total amount of Pt on the edges, different degrees of split Au@Pt nanorings were obtained; the subsequent Au coating around the Au@Pt scaffold eventually resulted in asymmetric Au hexagonal split nanorings. Their surface plasmonic features as a function of split degrees were investigated, including straight nanorods, bent nanorods, split nanorings, and full nanorings. The electrical field focusing using single-particle surface-enhanced Raman spectroscopy was evaluated under different polarization angles of the incident light for two different structures with the point gap and line gap between two arms.
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Affiliation(s)
| | - Sungjae Yoo
- Department of Chemistry, Sungkyunkwan University, Suwon 440-746, South Korea
| | - Jeongwon Kim
- Department of Chemistry, Sungkyunkwan University, Suwon 440-746, South Korea
| | - Jae-Myoung Kim
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Jiwoong Son
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Hyeon Seok Jeong
- Department of Applied Optics and Physics, Hallym University, Chuncheon 24252, South Korea
| | - Doojae Park
- Department of Applied Optics and Physics, Hallym University, Chuncheon 24252, South Korea
| | - Jwa-Min Nam
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Sungho Park
- Department of Chemistry, Sungkyunkwan University, Suwon 440-746, South Korea
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Wang J, Butet J, Bernasconi GD, Baudrion AL, Lévêque G, Horrer A, Horneber A, Martin OJF, Meixner AJ, Fleischer M, Adam PM, Zhang D. Strong second-harmonic generation from Au-Al heterodimers. NANOSCALE 2019; 11:23475-23481. [PMID: 31799534 DOI: 10.1039/c9nr07644a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Second-harmonic generation (SHG) is investigated from three kinds of lithographically fabricated plasmonic systems: Al monomers, Au monomers and Au-Al heterodimers with nanogaps of 20 nm. Spectrally integrated SHG intensities and the linear optical responses are recorded and compared. The results show that for the monomer nanoantennas, the SHG signal depends sensitively on the linear excitation of the plasmon resonance by the fundamental wavelength. For Au-Al heterodimer nanoantennas, apart from fundamental resonant excitation, nonlinear optical factors such as SH driving fields and phase interferences need to be taken into account, which play significant roles at the excitation and scattering stages of SHG radiation. It is interesting to note that a possible energy transfer process could take place between the two constituting nanoparticles (NPs) in the Au-Al heterodimers. Excited at the linear plasmon resonance, the Au NP transfers the absorbed energy from the fundamental field to the nearby Al NP, which efficiently scatters SHG to the far-field, giving rise to an enhanced SHG intensity. The mechanisms reported here provide new approaches to boost the far-field SHG radiation by taking full advantage of strongly coupled plasmonic oscillations and the synergism from materials of different compositions.
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Affiliation(s)
- Jiyong Wang
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany. and Light, Nanomaterials and Nanotechnology, University of Technology of Troyes, 12 Rue Marie Curie, CS42060, 10004 Troyes Cedex, France. and Center for Light-Matter-Interaction, Sensors and Analytics (LISA+), Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany and Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University, 18 Shilongshan Road, 310024 Hangzhou, Zhejiang Province, China and Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake Institute for Advanced Study, 18 Shilongshan Road, 310024 Hangzhou, Zhejiang Province, China
| | - Jérémy Butet
- Nanophotonics and Metrology Laboratory (NAM), Swiss Federal Institute of Technology, Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Gabriel David Bernasconi
- Nanophotonics and Metrology Laboratory (NAM), Swiss Federal Institute of Technology, Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Anne-Laure Baudrion
- Light, Nanomaterials and Nanotechnology, University of Technology of Troyes, 12 Rue Marie Curie, CS42060, 10004 Troyes Cedex, France.
| | - Gaëtan Lévêque
- Institut d'Electronique, de Microélectronique et de Nanotechnologie (IEMN, CNRS-8520), Cité Scientifique, Avenue Poincaré, 59652 Villeneuve d'Ascq, France
| | - Andreas Horrer
- Light, Nanomaterials and Nanotechnology, University of Technology of Troyes, 12 Rue Marie Curie, CS42060, 10004 Troyes Cedex, France. and Institute for Applied Physics, Eberhard Karls University of Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Anke Horneber
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany. and Center for Light-Matter-Interaction, Sensors and Analytics (LISA+), Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
| | - Olivier J F Martin
- Nanophotonics and Metrology Laboratory (NAM), Swiss Federal Institute of Technology, Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Alfred J Meixner
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany. and Center for Light-Matter-Interaction, Sensors and Analytics (LISA+), Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
| | - Monika Fleischer
- Center for Light-Matter-Interaction, Sensors and Analytics (LISA+), Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany and Institute for Applied Physics, Eberhard Karls University of Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
| | - Pierre-Michel Adam
- Light, Nanomaterials and Nanotechnology, University of Technology of Troyes, 12 Rue Marie Curie, CS42060, 10004 Troyes Cedex, France.
| | - Dai Zhang
- Institute of Physical and Theoretical Chemistry, Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany. and Center for Light-Matter-Interaction, Sensors and Analytics (LISA+), Eberhard Karls University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany
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