Fig. 2: Design for the non-Hermitian selective thermal emitter (NHE).
From: Non-Hermitian selective thermal emitter for thermophotovoltaics
a Schematic showing the metasurface and structure of the individual resonator. b Calculated normal direction emissivity from NHE as a function of SiO2 thickness. The horizontal dotted green line represents the SiO2 thickness (140 nm) considered for the final design. c Calculated normal direction spectral emissivity of NHE (blue) and Tungsten (W) substrate (red). The wavelengths shaded in blue are beyond the range of our emissivity measurements. The inset shows the calculated cross-sectional electric field and divergence of the Poynting vector profile at the resonance (λ = 1.6 μm). d Measured emissivity curves near normal direction from NHE and W at 1273 K. The inset shows the optical and SEM images of fabricated NHE.
