All-Optical Tuning of Light in WSe-Coated Microfiber.

The tungsten diselenide (WSe) 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 WSe-coated microfiber (MF) using WSe'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).

Broadband all-light-control with WS coated microfibers.

All-optical light amplitude tuning functionality is demonstrated in a layered tungsten disulfide (WS) nanosheets coated microfiber (MF) structure. Due to the strong light-matter interactions between WS nanosheets and the evanescent field around the MF, a large variation in the transmitted power can be observed under both external and internal pump light excitations over a broadband spectrum (~100 nm). A power variation rate of ~0.