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*

*此作品的通信作者

研究成果: Article同行評審

37 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)2857-2864
頁數8
期刊Nano letters
20
發行號4
DOIs
出版狀態Published - 8 4月 2020

指紋

深入研究「Chiral Second-Harmonic Generation from Monolayer WS2/Aluminum Plasmonic Vortex Metalens」主題。共同形成了獨特的指紋。

引用此