Magnetic plasmon resonances in nanostructured topological insulators for strongly enhanced light–MoS2 interactions
| Autor: | Jianlin Zhao, Dong Mao, Fajun Xiao, Yangwu Li, Wei Zeng, Xiaolin Wang, Weiyao Zhao, Yinan Zhang, Ting Mei, Hua Lu, Zengji Yue, Xuetao Gan, Min Gu, Mingwen Zhang |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Physics::Optics 02 engineering and technology 010402 general chemistry 01 natural sciences Article symbols.namesake Nanocavities Electric field Applied optics. Photonics Saturation (magnetic) Plasmon Nanophotonics and plasmonics Brewster's angle business.industry Optical physics QC350-467 Optics. Light 021001 nanoscience & nanotechnology Ray Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials TA1501-1820 Topological insulator symbols Optoelectronics 0210 nano-technology business Excitation |
| Zdroj: | Light, Science & Applications Light: Science & Applications, Vol 9, Iss 1, Pp 1-10 (2020) |
| ISSN: | 2047-7538 2095-5545 |
| Popis: | 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. Topological insulators: visible range magnetic resonances Nanostructured antimony telluride (Sb2Te3) can support visible range magnetic resonances and dramatically enhance the weak interactions of light with 2D materials. Hua Lu and workers from China and Australia used focused ion beam milling to write a grating of periodic nanogrooves into single-crystalline Sb2Te3, a well-known topological insulator. They then placed a flake of the 2D material MoS2 on top. Characterization showed the existence of a kind of magnetic plasmon resonances (MPRs) with a resonant wavelength that redshifts with increasing nanogroove height and pitch and blueshifts with increasing nanogroove width. Visible photoluminescence experiments showed that the MPRs can dramatically increase the emission from the MoS2, which could be tuned by changing the polarization angle of the incident excitation light. The findings are expected to aid the development of nanoscale optical devices made from layered nanomaterials. |
| Databáze: | OpenAIRE |
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