title: Ultra-broadband Tunable Resonant Light Trapping in a Two-dimensional Randomly Microstructured Plasmonic-photonic Absorber.
abstract: Recently, techniques involving random patterns have made it possible to control the light trapping of microstructures over broad spectral and angular ranges, which provides a powerful approach for photon management in energy efficiency technologies. Here, we demonstrate a simple method to create a wideband near-unity light absorber by introducing a dense and random pattern of metal-capped monodispersed dielectric microspheres onto an opaque metal film; the absorber works due to the excitation of multiple optical and plasmonic resonant modes. To further expand the absorption bandwidth, two different-sized metal-capped dielectric microspheres were integrated into a densely packed monolayer on a metal back-reflector. This proposed ultra-broadband plasmonic-photonic super absorber demonstrates desirable optical trapping in dielectric region and slight dispersion over a large incident angle range. Without any effort to strictly control the spatial arrangement of the resonant elements, our absorber, which is based on a simple self-assembly process, has the critical merits of high reproducibility and scalability and represents a viable strategy for efficient energy technologies.
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.|College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, China.
authors.forename: Zhengqi
authors.initials: Z
authors.lastname: Liu
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: Long
authors.initials: L
authors.lastname: Liu
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: Haiyang
authors.initials: H
authors.lastname: Lu
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhan
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Du
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: Mingjie
authors.initials: M
authors.lastname: Wan
authors.affiliation: School of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.|Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China.
authors.forename: Zhenlin
authors.initials: Z
authors.lastname: Wang