Characteristics of thermophotovoltaic emitter based on 2D cylindrical gear grating

A novel wavelength-selective thermophotovoltaic (TPV) emitter is proposed and analyzed with high emissivity. The suggested TPV emitter is based on cylindrical gear grating of tungsten with SiO2 spacer. The design geometry is studied to maximize its emissivity up to wavelength of 2.0 μm. The effect of oblique incidence at different polarizations on the design emissivity is also introduced. Additionally, the inductor-capacitor (LC) model is used to elucidate the behavior of magnetic resonance of the proposed grating. The reported TPV emitter exhibits high emissivity properties over large spectra range from ultraviolet to mid-infrared with spectral efficiency of 74% and 95% at 1000 and 2000 K, respectively. Further, high emissivity is achieved over a wide range of incident angles from 0 to 65° for the two polarized waves. The achieved perfect emissivity is due to the coupling between surface plasmon polariton, magnetic polariton and intrinsic loss of the tungsten material.