Tunable broadband, wide-angle, and polarization-dependent perfect infrared absorber based on planar structure containing phase-change material

Wang Xiaohua; Ding Wanying; Zhu Haixia; Liu Chenglin; Liu Youwen

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Tunable broadband, wide-angle, and polarization-dependent perfect infrared absorber based on planar structure containing phase-change material

机译：基于含有相变材料的平面结构的可调宽带，广角和偏振依赖性完善的红外吸收器

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A multilayer absorber composed of SiO2, Fe, Ge2Sb2Te5 (GST), and Al is designed, and the absorptive properties are theoretically investigated based on the Fresnel coefficients method in the wavelength range of 300-2500 nm by changing the thickness and crystallization rate of GST, the incident angle, and the polarization. The results show that the thin Fe layer plays a key role in obtaining an ultra-broadband perfect absorption. The absorption properties are polarization-dependent, and the perfect absorption can be nearly realized for a p-polarized wave at the incident angle smaller than 75 degrees with the bandwidth larger than 316 nm at 90% of max absorption value. The absorptive peak of this absorber can be tuned with the crystallization rate of GST by temperature, and the peak wavelength moves from 1433 nm in the amorphous phase to 2051 nm in the crystalline phase. This structure can provide a feasible route to design the tunable broadband, wide-angle, and polarization-dependent perfect absorber without lithographic patterns in the infrared band. (C) 2018 Optical Society of America

机译：设计了由SiO2，Fe，Ge2SB2Te5（GST）和Al组成的多层吸收器，并且通过改变GST的厚度和结晶速率，基于300-2500nm波长范围的菲涅耳系数方法理论上研究了吸收性。，入射角和极化。结果表明，薄的Fe层在获得超宽带完美吸收方面发挥着关键作用。吸收特性依赖于偏振，并且可以几乎实现了在发生的入射角处的P偏振波几乎实现了，其中带宽大于316nm的带宽，在最大吸收值的90％。该吸收剂的吸收峰可以通过温度的GST的结晶速率调谐，并且峰值波长在结晶相中从非晶相的1433nm移动到2051nm。该结构可以提供可行的路线来设计可调谐宽带，广角和偏振依赖性的完美吸收器，而无需红外带中的光刻图案。（c）2018年光学学会

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来源
《Applied optics》 |2018年第30期|共6页
作者
Wang Xiaohua; Ding Wanying; Zhu Haixia; Liu Chenglin; Liu Youwen;
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作者单位

Yancheng Teachers Univ Coll New Energy &

Elect Engn Yancheng 224007 Peoples R China;

Yancheng Teachers Univ Coll New Energy &

Elect Engn Yancheng 224007 Peoples R China;

Yancheng Teachers Univ Coll New Energy &

Elect Engn Yancheng 224007 Peoples R China;

Yancheng Teachers Univ Coll New Energy &

Elect Engn Yancheng 224007 Peoples R China;

Nanjing Univ Aeronaut &

Astronaut Coll Sci Nanjing 210016 Jiangsu Peoples R China;

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Tunable broadband, wide-angle, and polarization-dependent perfect infrared absorber based on planar structure containing phase-change material

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