title: Porous metal-based multilayers for selective thermal emitters.
abstract: We report the numerical study of a selective thermal emitter based on a metallic multilayered structure consisting of a graded antireflection top layer, a middle layer with uniform porosity (i.e., volume fraction of voids), and a nonporous substrate layer. Simulation results show that the proposed emitters feature an emission edge in near-IR where the emissivity drops from over 0.9 to below 0.1, for both the TE and TM polarizations. Moreover, these desired emission characteristics persist for a wide range of emission angles with the emission edge nearly nonshifted, making the proposed emitters promising for achieving isotropic thermal emission. The designed emitters are particularly attractive for the thermal-photovoltaic applications by suppressing emission below the photovoltaic material bandgap, which is normally in near-IR.
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong
authors.forename: Shiwei
authors.initials: S
authors.lastname: Shu
authors.forename: Lingxia
authors.initials: L
authors.lastname: Zheng
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Chun Kwan
authors.initials: CK
authors.lastname: Tsang
authors.forename: Liange
authors.initials: L
authors.lastname: Shi
authors.forename: Yang Yang
authors.initials: YY
authors.lastname: Li