All-Optical Tuning of Light in WSe2-Coated Microfiber

• Main Authors: Zhiran Shen, He Zhu, Jiyu Hong, Xun Gui, Heyuan Guan, Jiangli Dong, Hanguang Li, Xiaoli Wang, Wentao Qiu, Enze Zhang, Yunyao Ou, Dongqin Lu, Luqi Luo, Huihui Lu, Wenguo Zhu, Jianhui Yu, Yunhan Luo, Zhe Chen, Gangding Peng
• Format: Article
• Language: English
• Published: SpringerOpen 2019-11-01
• Series: Nanoscale Research Letters
• Subjects: Tungsten diselenide; Microfiber; All-optical tuning; Thermo-optic effect
• Online Access: https://doi.org/10.1186/s11671-019-3191-8
• ISSN: 1931-7573; 1556-276X

Abstract The tungsten diselenide (WSe2) has attracted considerable interest owing to their versatile applications, such as p-n junctions, transistors, fiber lasers, spintronics, and conversion of solar energy into electricity. We demonstrate all-optical tuning of light in WSe2-coated microfiber (MF) using WSe2’s broad absorption bandwidth and thermo-optic effect. The transmitted optical power (TOP) can be tuned using external incidence pump lasers (405, 532, and 660 nm). The sensitivity under 405-nm pump light excitation is 0.30 dB/mW. A rise/fall time of ~ 15.3/16.9 ms is achieved under 532-nm pump light excitation. Theoretical simulations are performed to investigate the tuning mechanism of TOP. The advantages of this device are easy fabrication, all-optical control, high sensitivity, and fast response. The proposed all-optical tunable device has potential applications in all-optical circuitry, all-optical modulator, and multi-dimensionally tunable optical devices, etc.