Resonance-enhanced all-optical modulation of WSe 2 -based micro-resonator

• Published in: Nanophotonics (Berlin, Germany) Vol. 9; no. 8; pp. 2387 - 2396
• Main Authors: Zhang, Zijian, Chen, Guowei, Yang, Mingyu, Ou, Yunyao, Luo, Luqi, Lu, Dongqin, Zhang, Enze, Guan, Heyuan, Lu, Huihui, Zhu, Wenguo, Yu, Jianhui, Dong, Jiangli, Qiu, Wentao, Chen, Zhe, Peng, Gangding
• Format: Journal Article
• Language: English
• Published: 01-08-2020
• ISSN: 2192-8606; 2192-8614
• DOI: 10.1515/nanoph-2019-0425

Abstract
Two-dimensional material tungsten diselenide (WSe
2
) nanosheets are coated on a microfibre knot resonator (MKR) to achieve an all-optical power modulation functionality. On account of the strong absorption property of WSe
2
and the resonance enhancement properties of MKR, the transmitted optical power of signal light within the WSe
2
-based MKR can be effectively modulated. The sensitivities of light–control–light experiments with 405- and 660-nm lasers are as high as 0.32 and 0.12 dB/mW, respectively. The sensitivities and power tuning can be enhanced by a higher resonance Q and a larger extinction ratio of MKR. In terms of the response time, the average rise and fall times are 3.5/3.7 and 3.5/4 ms with 405- and 660-nm lasers, respectively. This proposed structure is expected to achieve potential applications in all-fibre-optic–based tunable device such as optical modulator, detector, and so on.