Zijian Zhang, Guowei Chen, Mingyu Yang, Yunyao Ou, Luqi Luo, Dongqin Lu, Enze Zhang, Heyuan Guan, Huihui Lu, Wenguo Zhu, Jianhui Yu, Jiangli Dong, Wentao Qiu, Zhe Chen, Gangding Peng
December 9, 2019
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.