Chen Guowei, Zhang Zijian, Wang Xiaoli, Li Hanguang, Jiang Mengjiang, Guan Heyuan, Qiu Wentao, Lu Huihui, Dong Jiangli, Zhu Wenguo, Yu Jianhui, Zhong Yongchun, Luo Yunhan, Zhang Jun, Chen Zhe
Opt Express. 2018 Oct 15;26(21):27650-27658. doi: 10.1364/OE.26.027650.
All-optical light-control-light functionality is realized in a layered tungsten disulfide (WS) nanosheet coated microfiber knot resonator (MKR) structure. Mainly due to the photon generated excitons induced refractive index variation in WS nanosheets, a large variation in the transmitted power (∆T) can be observed under external violet/red laser excitation. The ∆T variation rates can reach up to ~0.4 dB/mW under violet pump light excitation whereas the state of the art light-control-light structures usually has a variation rate of less than 0.25 dB/mW. In terms of the response time, the averaged rise/fall time is ~0.12/0.1 s. The demonstrated structure has the advantages of easy fabrication, low cost and high sensitivity, therefore, it might be a promising candidate for building future all-fiber-optics based functional devices and all-optical circuitry.
全光控光功能在层状二硫化钨（WS）纳米片包覆的微光纤结谐振器（MKR）结构中得以实现。主要由于光子产生的激子在WS纳米片中引起折射率变化，在外部紫光/红光激光激发下，可以观察到透射功率（∆T）有很大变化。在紫光泵浦光激发下，∆T变化率可达~0.4 dB/mW，而目前先进的光控光结构的变化率通常小于0.25 dB/mW。就响应时间而言，平均上升/下降时间约为0.12/0.1秒。所展示的结构具有易于制造、成本低和灵敏度高的优点，因此，它可能是构建未来基于全光纤的功能器件和全光电路的一个有前途的候选方案。
