Magnetic plasmon resonances in nanostructured topological insulators for strongly enhanced light-MoS2 interactions

Hua Lu; Zengji Yue; Yangwu Li; Yinan Zhang; Mingwen Zhang; Wei Zeng; Xuetao Gan; Dong Mao; Fajun Xiao; Ting Mei; Weiyao Zhao; Xiaolin Wang; Min Gu; Jianlin Zhao

doi:10.1038/s41377-020-00429-x

Magnetic plasmon resonances in nanostructured topological insulators for strongly enhanced light-MoS₂ interactions

Light Sci Appl. 2020 Nov 23;9(1):191. doi: 10.1038/s41377-020-00429-x.

Authors

Hua Lu¹, Zengji Yue², Yangwu Li³, Yinan Zhang^{4

5}, Mingwen Zhang³, Wei Zeng⁶, Xuetao Gan³, Dong Mao³, Fajun Xiao³, Ting Mei³, Weiyao Zhao², Xiaolin Wang², Min Gu⁷, Jianlin Zhao⁸

Affiliations

¹ MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, 710129, Xi'an, China. hualu@nwpu.edu.cn.
² Institute for Superconducting & Electronic Materials and ARC Centre of Excellence in Future Low-Energy Electronics, University of Wollongong, North Wollongong, NSW, 2500, Australia.
³ MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, 710129, Xi'an, China.
⁴ Center for Artificial-Intelligence Nanophotonics, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, 200093, Shanghai, China. zhangyinan@jnu.edu.cn.
⁵ Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, 510632, Guangzhou, China. zhangyinan@jnu.edu.cn.
⁶ State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, 710072, Xi'an, China.
⁷ Center for Artificial-Intelligence Nanophotonics, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, 200093, Shanghai, China.
⁸ MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, 710129, Xi'an, China. jlzhao@nwpu.edu.cn.

Abstract

Magnetic resonances not only play crucial roles in artificial magnetic materials but also offer a promising way for light control and interaction with matter. Recently, magnetic resonance effects have attracted special attention in plasmonic systems for overcoming magnetic response saturation at high frequencies and realizing high-performance optical functionalities. As novel states of matter, topological insulators (TIs) present topologically protected conducting surfaces and insulating bulks in a broad optical range, providing new building blocks for plasmonics. However, until now, high-frequency (e.g. visible range) magnetic resonances and related applications have not been demonstrated in TI systems. Herein, we report for the first time, to our knowledge, a kind of visible range magnetic plasmon resonances (MPRs) in TI structures composed of nanofabricated Sb₂Te₃ nanogrooves. The experimental results show that the MPR response can be tailored by adjusting the nanogroove height, width, and pitch, which agrees well with the simulations and theoretical calculations. Moreover, we innovatively integrated monolayer MoS₂ onto a TI nanostructure and observed strongly reinforced light-MoS₂ interactions induced by a significant MPR-induced electric field enhancement, remarkable compared with TI-based electric plasmon resonances (EPRs). The MoS₂ photoluminescence can be flexibly tuned by controlling the incident light polarization. These results enrich TI optical physics and applications in highly efficient optical functionalities as well as artificial magnetic materials at high frequencies.