Enhancing third-harmonic generation with spatial nonlocality

As the geometrical feature of a nanostructure approaches the Thomas-Fermi screening length, the electron-level interaction induced nonlocality leads to the longitudinal resonance modes above bulk plasmon resonance frequency. In this work, we investigate the contribution of longitudinal modes to the...

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Main Authors: Hu, Hao, Zhang, Jingjing, Maier, Stefan A., Luo, Yu
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/139343
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1393432020-05-19T03:14:36Z Enhancing third-harmonic generation with spatial nonlocality Hu, Hao Zhang, Jingjing Maier, Stefan A. Luo, Yu School of Electrical and Electronic Engineering Engineering::Electrical and electronic engineering Nanostructure Surface Plasmons As the geometrical feature of a nanostructure approaches the Thomas-Fermi screening length, the electron-level interaction induced nonlocality leads to the longitudinal resonance modes above bulk plasmon resonance frequency. In this work, we investigate the contribution of longitudinal modes to the enhancement of third-harmonic generation process. Specifically, we study a single Ag nanowire and a Ag nanowire dimer coated with third-order nonlinear dielectrics. By implementing hydrodynamic and nonlinear models together, we find that the spectral overlap of the longitudinal resonance modes with third order harmonics enables the improvement of the nonlinear conversion efficiency. The optimized results show that despite of reduced field enhancement for the fundamental resonance, the third-harmonic absorption intensities in nonlocal case can surpass the local calculation results by hundreds of times. Maximum third-harmonic scattering intensities can also be realized though appropriate design of both structures. In contrast to previous studies that mainly focus on the negative effects of nonlocality, our study indicates that the nonlocal effects may benefit our system with proper designs, opening a new door for quantum plasmonic research. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) 2020-05-19T03:14:36Z 2020-05-19T03:14:36Z 2017 Journal Article Hu, H., Zhang, J., Maier, S. A., & Luo, Y. (2018). Enhancing third-harmonic generation with spatial nonlocality. ACS Photonics, 5(2), 592-598. doi:10.1021/acsphotonics.7b01167 2330-4022 https://hdl.handle.net/10356/139343 10.1021/acsphotonics.7b01167 2-s2.0-85037838825 2 5 592 598 en ACS Photonics © 2017 American Chemical Society. All rights reserved.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering
Nanostructure
Surface Plasmons
spellingShingle Engineering::Electrical and electronic engineering
Nanostructure
Surface Plasmons
Hu, Hao
Zhang, Jingjing
Maier, Stefan A.
Luo, Yu
Enhancing third-harmonic generation with spatial nonlocality
description As the geometrical feature of a nanostructure approaches the Thomas-Fermi screening length, the electron-level interaction induced nonlocality leads to the longitudinal resonance modes above bulk plasmon resonance frequency. In this work, we investigate the contribution of longitudinal modes to the enhancement of third-harmonic generation process. Specifically, we study a single Ag nanowire and a Ag nanowire dimer coated with third-order nonlinear dielectrics. By implementing hydrodynamic and nonlinear models together, we find that the spectral overlap of the longitudinal resonance modes with third order harmonics enables the improvement of the nonlinear conversion efficiency. The optimized results show that despite of reduced field enhancement for the fundamental resonance, the third-harmonic absorption intensities in nonlocal case can surpass the local calculation results by hundreds of times. Maximum third-harmonic scattering intensities can also be realized though appropriate design of both structures. In contrast to previous studies that mainly focus on the negative effects of nonlocality, our study indicates that the nonlocal effects may benefit our system with proper designs, opening a new door for quantum plasmonic research.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Hu, Hao
Zhang, Jingjing
Maier, Stefan A.
Luo, Yu
format Article
author Hu, Hao
Zhang, Jingjing
Maier, Stefan A.
Luo, Yu
author_sort Hu, Hao
title Enhancing third-harmonic generation with spatial nonlocality
title_short Enhancing third-harmonic generation with spatial nonlocality
title_full Enhancing third-harmonic generation with spatial nonlocality
title_fullStr Enhancing third-harmonic generation with spatial nonlocality
title_full_unstemmed Enhancing third-harmonic generation with spatial nonlocality
title_sort enhancing third-harmonic generation with spatial nonlocality
publishDate 2020
url https://hdl.handle.net/10356/139343
_version_ 1681058401372602368