Main > Photonics Research >  Volume 4 >  Issue 4 >  Page 04000146 > Article
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Accepted: Jun. 23, 2016

Posted: Mar. 22, 2019

Published Online: Mar. 22, 2019

The Author Email: Zhi-Yuan Li (lizy@aphy.iphy.ac.cn)

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Ximin Tian, Zhi-Yuan Li. Visible-near infrared ultra-broadband polarization-independent metamaterial perfect absorber involving phase-change materials[J]. Photonics Research, 2016, 4(4): 04000146

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## Abstract

We numerically demonstrate a novel ultra-broadband polarization-independent metamaterial perfect absorber in the visible and near-infrared region involving the phase-change material $Ge2Sb2Te5$ (GST). The novel perfect absorber scheme consists of an array of high-index strong-absorbance GST square resonators separated from a continuous Au substrate by a low-index lossless dielectric layer (silica) and a high-index GST planar cavity. Three absorption peaks with the maximal absorbance up to 99.94% are achieved, owing to the excitation of plasmon-like dipolar or quadrupole resonances from the high-index GST resonators and cavity resonances generated by the GST planar cavity. The intensities and positions of the absorption peaks show strong dependence on structural parameters. A heat transfer model is used to investigate the temporal variation of temperature within the GST region. The results show that the temperature of amorphous GST can reach up to 433 K of the phase transition temperature from room temperature in just 0.37 ns with a relatively low incident light intensity of $1.11×108 W/m2$, due to the enhanced ultra-broadband light absorbance through strong plasmon resonances and cavity resonance in the absorber. The study suggests a feasible means to lower the power requirements for photonic devices based on a thermal phase change via engineering ultra-broadband light absorbers.