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Updated: Mar 24, 2026
Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
Published on: July 21, 2018
Wavelength-selective emitters with pyramid nanogratings enhanced by multiple resonance modes
Nghia Nguyen-Huu1, Jaromír Pištora, Michael Cada
1Department of Electrical and Computer Engineering, Dalhousie University, Halifax, Nova Scotia N3H 4R2, Canada. Nanotechnology Centre, VSB-Technical University of Ostrava, Ostrava-Poruba 708 33, Czech Republic.
Abstract:
Binary gratings with high or low metal filling ratios in a grating region have been demonstrated as successful candidates in enhancing the emittance of emitters for thermophotovoltaics since they could support surface plasmons (SPs), the Rayleigh-Wood anomaly (RWA), or cavity resonance (CR) within their geometries. This work shows that combining a tungsten binary grating with a low and high filling ratio to form a pyramid grating can significantly increase the emittance, which is nearly perfect in the wavelength region from 0.6 to 1.72 μm, while being 0.1 at wavelengths longer than 2.5 μm. Moreover, the emittance spectrum of the hybrid tungsten grating is insensitive to the angle of incidence. The enhancement demonstrated by magnetic field and Poynting vector patterns is due to the interplay between SPs and RWA modes at short wavelengths, and CR at long wavelengths. Furthermore, a combined grating made of nickel is also proposed providing enhanced emittance in a wide angle of incidence.
