title: Global optimization of omnidirectional wavelength selective emitters/absorbers based on dielectric-filled anti-reflection coated two-dimensional metallic photonic crystals.
abstract: We report the design of dielectric-filled anti-reflection coated (ARC) two-dimensional (2D) metallic photonic crystals (MPhCs) capable of omnidirectional, polarization insensitive, wavelength selective emission/absorption. Using non-linear global optimization methods, optimized hafnium oxide (HfO2)-filled ARC 2D Tantalum (Ta) PhC designs exhibiting up to 26% improvement in emittance/absorptance at wavelengths λ below a cutoff wavelength λc over the unfilled 2D TaPhCs are demonstrated. The optimized designs possess high hemispherically average emittance/absorptance εH of 0.86 at λ < λc and low εH of 0.12 at λ > λc.
authors.forename: Yi Xiang
authors.initials: YX
authors.lastname: Yeng
authors.forename: Jeffrey B
authors.initials: JB
authors.lastname: Chou
authors.forename: Veronika
authors.initials: V
authors.lastname: Rinnerbauer
authors.forename: Yichen
authors.initials: Y
authors.lastname: Shen
authors.forename: Sang-Gook
authors.initials: SG
authors.lastname: Kim
authors.forename: John D
authors.initials: JD
authors.lastname: Joannopoulos
authors.forename: Marin
authors.initials: M
authors.lastname: Soljacic
authors.forename: Ivan
authors.initials: I
authors.lastname: Celanović