Tempering Hemispherical Radiative Properties with a Resonance Compilation
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This work demonstrates tailored hemispherical absorptance A, reflectance R, and transmittance T spectra at the coexistence of three resonances. The localized surface plasmon resonance (LSPR) is excited by a hexagonal array of 15-nm-thick circular Au pillars at the wavelength λLSPR. The Berreman and epsilon near zero (ENZ) mode resonances are generated within a fixed region λENZ ≈ 1.5 μm using diffracted waves inside a 230-nm-thick indium-tin-oxide film. The λLSPR of four samples approaches λENZ via increasing pillar diameters. For the first time, a broadband absorptance enhancement resulting from three compatible resonances is shown. The resonance compilation together with material loss cause failure of a popular LSPR indicator, which are replaced by the robust indicators proposed here.
KeywordsBerreman mode Epsilon near zero mode Localized surface plasmon resonance Radiative property Resonance coexistence
Authors appreciate Mr. Hao-Yuan Chung for his assistance in fabricating samples. Helps from Mr. Bo-Hung Chen and Mr. Fu-Yuan Shih during revision are also appreciated. The work is supported by the National Science Council (NSC) and Ministry of Science and Technology (MOST) in Taiwan under grants No. NSC-101-2628-E-006-014-MY3, No. NSC-103-2120-M-006-005, and MOST-103-3113-E-006-005.
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