Double-sided and omnidirectional absorption of visible light in tapered dielectric nanostructure coated with non-noble metal.

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2019
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Abstract
The common complex architecture constitutes the major bottleneck of optical absorber operating on broadband spectrum. Here we demonstrate a super absorber consisting of tapered dielectric nanostructure coated with a thin-layer of non-noble metal chromium on flexible poly(ethylene terephthalate) substrate. The proposed device yields double-sided, omnidirectional, and polarization-independent absorption over the entire visible spectrum with an average efficiency more than 90% at normal incidence, and 80% at a tilt incident angle of 60°. It can be easily realized by nanoimprinting lithography combined with physical vapor deposition technique. Theoretical analysis demonstrates that the superior optical performance is ascribed to the non-resonant light absorption by using the metal-covered, closed-packed tapered nanostructure via adiabatic nanofocusing of the metal-dielectric-metal (MDM) guided modes excited by scattering of the gradually changing nanostructure. For the cost-effective fabrication and material strategy, the super absorber has potential applications in a wide range of passive and active photonic devices, including inkless printing, harvesting solar energy, as well as thermal emitter and optical detector.
Reference Key
shen2019doublesidedoptics Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Shen, Su;Tang, Jie;Yu, Jiang;Zhou, Lei;Zhou, Yun;
Journal Optics express
Year 2019
DOI
10.1364/OE.27.024989
URL
Keywords
Electrical conductivity nanoparticles heat transfer rheology chemical engineering nanotechnology thermal conductivity carbon nanotubes density multi-walled carbon nanotubes viscosity nanofluidics solar glycol

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