Broadband Polarization-Independent Perfect Absorber Using a Phase-Change Metamaterial at Visible Frequencies

被引:282
作者
Cao, Tun [1 ]
Wei, Chen-wei [1 ]
Simpson, Robert E. [3 ]
Zhang, Lei [1 ]
Cryan, Martin J. [2 ]
机构
[1] Dalian Univ Technol, Fac Elect informat & Elect Engn, Dept Biomed Engn, Dalian, Peoples R China
[2] Univ Bristol, Dept Elect & Elect Engn, Bristol, Avon, England
[3] SUTD, Singapore, Singapore
来源
SCIENTIFIC REPORTS | 2014年 / 4卷
基金
中国国家自然科学基金;
关键词
ABSORPTION; DESIGN; PLASMONICS; LIGHT; FILMS;
D O I
10.1038/srep03955
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
We report a broadband polarization-independent perfect absorber with wide-angle near unity absorbance in the visible regime. Our structure is composed of an array of thin Au squares separated from a continuous Au film by a phase change material (Ge2Sb2Te5) layer. It shows that the near perfect absorbance is flat and broad over a wide-angle incidence up to 80 degrees for either transverse electric or magnetic polarization due to a high imaginary part of the dielectric permittivity of Ge2Sb2Te5. The electric field, magnetic field and current distributions in the absorber are investigated to explain the physical origin of the absorbance. Moreover, we carried out numerical simulations to investigate the temporal variation of temperature in the Ge2Sb2Te5 layer and to show that the temperature of amorphous Ge2Sb2Te5 can be raised from room temperature to > 433 K (amorphous-to-crystalline phase transition temperature) in just 0.37 ns with a low light intensity of 95 nW/mu m(2), owing to the enhanced broadband light absorbance through strong plasmonic resonances in the absorber. The proposed phase-change metamaterial provides a simple way to realize a broadband perfect absorber in the visible and near-infrared (NIR) regions and is important for a number of applications including thermally controlled photonic devices, solar energy conversion and optical data storage.
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页数:8
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