Abstract
Wavelength selectivity of emitters is of great importance for thermophotovoltaic applications. In this paper, a modified 1D trilayer films grating with a silica (SiO2) layer sandwiched between two tungsten (W) layers to form the W/SiO2/W structure is proposed to obtain high spectral selective emittance. High average emittance of 0.95 is obtained for TM waves from about 600nm to 1900nm, and a broadband emission peak with emittance close to unity occurs between 900nm and 1800nm. Simultaneously, the emittance decreases sharply when λ>1800nm, which can minimize the thermal loss. The finite-difference time-domain method (FDTD) is utilized to analyze the radiative properties of the grating. The inductance–capacitance (LC) circuit model for this trilayer grating structure is presented to predict the magnetic polaritons (MPs) resonance location compared with the results obtained by FDTD method. The effects of the geometric parameters and emission angles on the emittance of the proposed grating are also investigated. The broadband emittance peak is considered as the combined results of the surface plasmon polaritons (SPPs) and several fundamental modes of magnetic polaritons (MPs) resonance at neighboring wavelengths.
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