Dual-band total absorption via guided mode resonance in a monolayer MoS_2 covered dielectric grating structure

摘要

In this paper, we have theoretically investigated the absorption response in a monolayer MoS2 covered one-dimensional dielectric grating structure at visible region. Through RCWA calculation, a dual-band total optical absorption has been numerically obtained in this proposed resonance structure. It has been demonstrated that the dual-band total absorption is enabled by the guided resonances with the critical coupling. Moreover, our calculation results also show that the resonance absorption wavelength could be controlled by choosing the proper structural parameters of this system. The ultra-high dual-channel light absorption offered by this simple and compact geometry may lead to the multiple-channel photonic devices in applications of optical detecting, sensing, storage and communication.