A numerical study of dynamic tunability of perfect absorption with temperature in the visible region based on a nanostructure containing multilayer graphene

We present a multilayer graphene-embedded nano-cross elliptical hole (MGENCEH) structure that has dynamic tunability of perfect absorption (PA) with temperature in the visible region. The results of the numerical simulation show that the structure can realize absorption that retains super-99.9% over a wide incident angle of both transverse electric (TE) and transverse magnetic (TM) polarization light. This PA is higher than the results of Zhou et al. (2009 [53], http://dx.doi.org/10.1364/OE.23.00A413). The simulation shows that the absorption bands of PA can be broadened more than six times larger than no graphene structure. The dynamic tunability of PA with temperature in the visible region is not a completely linear relationship as compared to the terahertz region (Ardakani, 2015 [42], http://dx.doi.org/10.1140/epjb/e2015-60233-0). This mechanism of PA is mainly caused by hybrid plasmon absorption at higher temperatures and exciton absorption at lower temperatures. The simple and flexible PA is particularly desirable for various potential applications such as solar energy absorbers.