Chiral Second-Harmonic Generation from Monolayer WS2/Aluminum Plasmonic Vortex Metalens

Wan Ping Guo; Wei Yun Liang; Chang Wei Cheng; Wei Lin Wu; Yen Ting Wang; Quan Sun; Shuai Zu; Hiroaki Misawa; Pi Ju Cheng; Shu Wei Chang; Hyeyoung Ahn; Minn Tsong Lin; Shangjr Gwo

doi:10.1021/acs.nanolett.0c00645

Chiral Second-Harmonic Generation from Monolayer WS₂/Aluminum Plasmonic Vortex Metalens

Wan Ping Guo, Wei Yun Liang, Chang Wei Cheng, Wei Lin Wu, Yen Ting Wang, Quan Sun, Shuai Zu, Hiroaki Misawa, Pi Ju Cheng, Shu Wei Chang, Hyeyoung Ahn^*, Minn Tsong Lin^*, Shangjr Gwo^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

40 Scopus citations

Abstract

Two-dimensional spiral plasmonic structures have emerged as a versatile approach to generate near-field vortex fields with tunable topological charges. We demonstrate here a far-field approach to observe the chiral second-harmonic generation (SHG) at designated visible wavelengths from a single plasmonic vortex metalens. This metalens comprises an Archimedean spiral slit fabricated on atomically flat aluminum epitaxial film, which allows for precise tuning of plasmonic resonances and subsequent transfer of two-dimensional materials on top of the spiral slit. The nonlinear optical measurements show a giant SHG circular dichroism. Furthermore, we have achieved an enhanced chiral SHG conversion efficiency (about an order of magnitude greater than the bare aluminum lens) from monolayer tungsten disulfide (WS₂)/aluminum metalens, which is designed at the C-exciton resonance of WS₂. Since the C-exciton is not a valley exciton, the enhanced chiral SHG in this hybrid system originates from the plasmonic vortex field-enhanced SHG under the optical spin-orbit interaction.

Original language	English
Pages (from-to)	2857-2864
Number of pages	8
Journal	Nano letters
Volume	20
Issue number	4
DOIs	https://doi.org/10.1021/acs.nanolett.0c00645
State	Published - 8 Apr 2020

Keywords

Surface plasmonic vortex metalens
aluminum epitaxial film
chiral nonlinearity
monolayer tungsten disulfide
optical spin-orbit interaction
second-harmonic generation

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10.1021/acs.nanolett.0c00645

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title = "Chiral Second-Harmonic Generation from Monolayer WS2/Aluminum Plasmonic Vortex Metalens",

abstract = "Two-dimensional spiral plasmonic structures have emerged as a versatile approach to generate near-field vortex fields with tunable topological charges. We demonstrate here a far-field approach to observe the chiral second-harmonic generation (SHG) at designated visible wavelengths from a single plasmonic vortex metalens. This metalens comprises an Archimedean spiral slit fabricated on atomically flat aluminum epitaxial film, which allows for precise tuning of plasmonic resonances and subsequent transfer of two-dimensional materials on top of the spiral slit. The nonlinear optical measurements show a giant SHG circular dichroism. Furthermore, we have achieved an enhanced chiral SHG conversion efficiency (about an order of magnitude greater than the bare aluminum lens) from monolayer tungsten disulfide (WS2)/aluminum metalens, which is designed at the C-exciton resonance of WS2. Since the C-exciton is not a valley exciton, the enhanced chiral SHG in this hybrid system originates from the plasmonic vortex field-enhanced SHG under the optical spin-orbit interaction.",

keywords = "Surface plasmonic vortex metalens, aluminum epitaxial film, chiral nonlinearity, monolayer tungsten disulfide, optical spin-orbit interaction, second-harmonic generation",

author = "Guo, {Wan Ping} and Liang, {Wei Yun} and Cheng, {Chang Wei} and Wu, {Wei Lin} and Wang, {Yen Ting} and Quan Sun and Shuai Zu and Hiroaki Misawa and Cheng, {Pi Ju} and Chang, {Shu Wei} and Hyeyoung Ahn and Lin, {Minn Tsong} and Shangjr Gwo",

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doi = "10.1021/acs.nanolett.0c00645",

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T1 - Chiral Second-Harmonic Generation from Monolayer WS2/Aluminum Plasmonic Vortex Metalens

AU - Guo, Wan Ping

AU - Liang, Wei Yun

AU - Cheng, Chang Wei

AU - Wu, Wei Lin

AU - Wang, Yen Ting

AU - Sun, Quan

AU - Zu, Shuai

AU - Misawa, Hiroaki

AU - Cheng, Pi Ju

AU - Chang, Shu Wei

AU - Ahn, Hyeyoung

AU - Lin, Minn Tsong

AU - Gwo, Shangjr

PY - 2020/4/8

Y1 - 2020/4/8

N2 - Two-dimensional spiral plasmonic structures have emerged as a versatile approach to generate near-field vortex fields with tunable topological charges. We demonstrate here a far-field approach to observe the chiral second-harmonic generation (SHG) at designated visible wavelengths from a single plasmonic vortex metalens. This metalens comprises an Archimedean spiral slit fabricated on atomically flat aluminum epitaxial film, which allows for precise tuning of plasmonic resonances and subsequent transfer of two-dimensional materials on top of the spiral slit. The nonlinear optical measurements show a giant SHG circular dichroism. Furthermore, we have achieved an enhanced chiral SHG conversion efficiency (about an order of magnitude greater than the bare aluminum lens) from monolayer tungsten disulfide (WS2)/aluminum metalens, which is designed at the C-exciton resonance of WS2. Since the C-exciton is not a valley exciton, the enhanced chiral SHG in this hybrid system originates from the plasmonic vortex field-enhanced SHG under the optical spin-orbit interaction.

AB - Two-dimensional spiral plasmonic structures have emerged as a versatile approach to generate near-field vortex fields with tunable topological charges. We demonstrate here a far-field approach to observe the chiral second-harmonic generation (SHG) at designated visible wavelengths from a single plasmonic vortex metalens. This metalens comprises an Archimedean spiral slit fabricated on atomically flat aluminum epitaxial film, which allows for precise tuning of plasmonic resonances and subsequent transfer of two-dimensional materials on top of the spiral slit. The nonlinear optical measurements show a giant SHG circular dichroism. Furthermore, we have achieved an enhanced chiral SHG conversion efficiency (about an order of magnitude greater than the bare aluminum lens) from monolayer tungsten disulfide (WS2)/aluminum metalens, which is designed at the C-exciton resonance of WS2. Since the C-exciton is not a valley exciton, the enhanced chiral SHG in this hybrid system originates from the plasmonic vortex field-enhanced SHG under the optical spin-orbit interaction.

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KW - chiral nonlinearity

KW - monolayer tungsten disulfide

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Chiral Second-Harmonic Generation from Monolayer WS₂/Aluminum Plasmonic Vortex Metalens

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