Polarization-sensitive switchable display through critical coupling between graphene and a quasi-BIC
Zonglin Li, Guozheng Nie, Zhiquan Chen, Deqiong Li, Diwen Tan, Hui Xu, Yunxin Liu
Abstract
-) factor when the in-plane symmetry is broken. As the graphene monolayer was introduced into the system, its absorption was enhanced by the quasi-BIC resonance. By optimizing the graphene Fermi energy and the asymmetry parameter of the metasurface to satisfy the critical-coupling condition, a tunable absorber could be achieved. The absorbing intensity could be efficiently modulated by varying the polarization direction of the incident light, the maximum difference of which was up to 95.4%. Also, further investigation showed that such a feature indicates potential application in digital switches and image displays, which could be switched by incident polarization only, and therefore without dependence on an additional structural change.