Large-scale, low-cost, broadband and tunable perfect optical absorber based on phase-change material.

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ID: 87670
2020
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Abstract
Metamaterial-based electromagnetic absorbers have attracted much attention recently, but most previous realizations suffer from issues of narrow bandwidth, time-consuming and high-cost fabrication methods, and/or fixed functionalities, and so are unfavorable for practical applications. Here, we demonstrate experimentally a large-scale, broadband, polarization-independent, and tunable metamaterial absorber, which works for both visible and near-infrared light. A lithography-free and low-cost method was utilized to fabricate a centimeter-sized metamaterial sample in a metal-insulator-metal (MIM) configuration with nano-scale precision, in which a phase-change material, Ge2Sb2Te5 (GST), was adopted as the insulating spacer of the MIM structure. With two different resonance mechanisms working together, the proposed device was shown to exhibit high absorptivity (>80%) within a broad wavelength band (480-1020 nm). By thermally tuning the phase state of the GST layer, we can dramatically enlarge the working bandwidth of the metamaterial absorber by shifting one absorption peak by about 470 nm. These findings may stimulate many potential applications in, for example, solar cells, energy harvesting, smart sensing/imaging, and color printing.
Reference Key
mou2020largescalenanoscale Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Mou, Nanli;Liu, Xiaolong;Wei, Tao;Dong, Hongxing;He, Qiong;Zhou, Lei;Zhang, Yaqiang;Zhang, Long;Sun, Shulin;
Journal Nanoscale
Year 2020
DOI
10.1039/c9nr07602f
URL
Keywords
benzo[1,2-b:4,5-c′]dithiophene-4,8-dione donor polymers nonfullerene solar cells thieno[3,4-b]thiophene

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