Spatial regulation of thermal emission based on polar material

摘要

The ability to regulate the emission angle of thermal source is crucial for improving the efficiency of many energyconversion systems. Here, we design a structure of Ge/Al_2O_3/Au which can realize the spatial regulation of thermalemission. It has been shown that nearly perfect absorption could be attained and the range of emission angle could betuned without structural patterning. By utilizing Berreman mode and intrinsic loss of Al_2O_3, we could attain theexpansion of the range of emission angle.