Abstract
A kind of concave tungsten complex grating based on superposition of two simple binary tungsten gratings with different groove depths has been proposed for potential application as thermophotovoltaic (TPV) selective emitters. The effect of the simple grating geometric parameters on the spectral emittance is calculated numerically by using the rigorous coupled-wave analysis (RCWA). The emittance of the complex grating shows broadband-directional insensitive peak in the spectral region where the quantum efficiency of TPV cells is high, which is explained by the surface plasmon polariton (SPP). The results show that the complex grating has high emittance value, above 0.8, within the spectral range of 0.8
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