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(a) Real and imaginary parts of relative permittivity for tungsten. The circles represent experimental data from Ref. 8. The lines were fitted using the complex-conjugate pole-residue pairs with parameters given in Table I. (b) Absorptivity at normal incidence of semi-infinite tungsten slab.
(a) Illustration of the tungsten pyramid structure with nine unit cells showing. (b) Simulated absorptivity for various polar angles of incidence. (c) Simulated absorptivity for and various azimuthal angles. In both (b) and (c), the gray curve is the AM1.5 solar irradiance spectrum.
Simulated absorptivity for normal incidence , for a structure with period and with varying pyramid heights. The gray curve is the AM1.5 solar irradiance spectrum
Simulated absorptivity at normal incidence , for a structure with pyramid height of , and varying periods. The gray curve is the AM1.5 solar irradiance spectrum.
Parameters for a fit of tungsten’s relative permittivity with complex-conjugate pole-residue pairs.
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