|Title||Angle-selective perfect absorption with two-dimensional materials|
|Publication Type||Journal Article|
|Year of Publication||2016|
|Authors||Zhu, L, Liu, F, Lin, H, Hu, J, Yu, Z, Wang, X, Fan, S|
|Journal||Light-Science & Applications|
|Keywords||angle-selective perfect absorption, angle-selective thin optical element, broad-band, electrooptic modulator, gated graphene, graphene, heterostructure, high-responsivity, mid-infrared, nanophotonics, optical modulator, plasmons, room-temperature, two-dimensional materials, ultrafast graphene photodetector|
Two-dimensional (2D) materials have great potential in photonic and optoelectronic devices. However, the relatively weak light absorption in 2D materials hinders their application in practical devices. Here, we propose a general approach to achieve angle-selective perfect light absorption in 2D materials. As a demonstration of the concept, we experimentally show giant light absorption by placing large-area single-layer graphene on a structure consisting of a chalcogenide layer atop a mirror and achieving a total absorption of 77.6% in the mid-infrared wavelength range (similar to 13 mu m), where the graphene contributes a record-high 47.2% absorptivity of mid-infrared light. Construction of such an angle-selective thin optical element is important for solar and thermal energy harvesting, photo-detection and sensing applications. Our study points to a new opportunity to combine 2D materials with photonic structures to enable novel device applications.
|Short Title||Light-Sci. Appl.|