The ability to regulate the emission angle of thermal source is crucial for improving the efficiency of many energy conversion systems. Here, we design a structure of Ge/Al2O3/Au which can realize the spatial regulation of thermal emission. It has been shown that nearly perfect absorption could be attained and the range of emission angle could be tuned without structural patterning. By utilizing Berreman mode and intrinsic loss of Al2O3, we could attain the expansion of the range of emission angle.
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