title: Broadband absorption engineering of hyperbolic metafilm patterns.
abstract: Perfect absorbers are important optical/thermal components required by a variety of applications, including photon/thermal-harvesting, thermal energy recycling, and vacuum heat liberation. While there is great interest in achieving highly absorptive materials exhibiting large broadband absorption using optically thick, micro-structured materials, it is still challenging to realize ultra-compact subwavelength absorber for on-chip optical/thermal energy applications. Here we report the experimental realization of an on-chip broadband super absorber structure based on hyperbolic metamaterial waveguide taper array with strong and tunable absorption profile from near-infrared to mid-infrared spectral region. The ability to efficiently produce broadband, highly confined and localized optical fields on a chip is expected to create new regimes of optical/thermal physics, which holds promise for impacting a broad range of energy technologies ranging from photovoltaics, to thin-film thermal absorbers/emitters, to optical-chemical energy harvesting.
authors.affiliation: Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260.
authors.forename: Dengxin
authors.initials: D
authors.lastname: Ji
authors.affiliation: Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260.
authors.forename: Haomin
authors.initials: H
authors.lastname: Song
authors.affiliation: Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260.
authors.forename: Xie
authors.initials: X
authors.lastname: Zeng
authors.affiliation: Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Hu
authors.affiliation: Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260.
authors.forename: Kai
authors.initials: K
authors.lastname: Liu
authors.affiliation: Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260.
authors.forename: Nan
authors.initials: N
authors.lastname: Zhang
authors.affiliation: Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260.
authors.forename: Qiaoqiang
authors.initials: Q
authors.lastname: Gan