Abstract
This paper theoretically describes coupling mechanism between spoof surface plasmon (SSP) and radiative field. We calculate absorbance of periodic microcavity array using exact Rigorous Couped-Wave Analysis (RCWA) method and discuss the coupling condition of SSP and incident beams. We derive angular dependence of emittance of thermal radiation and this results show quasi-vertical narrow-band thermal emission from the microcavity array.
