High contrast switchability of VO2 based metamaterial absorbers with ITO ground plane

被引：91

作者：

Pradhan, Jitendra K. ^{[1
]}

Ramakrishna, S. Anantha ^{[1
]}

Rajeswaran, Bharathi ^{[2
]}

Umarji, Arun M. ^{[2
]}

Achanta, Venu Gopal ^{[3
]}

Agarwal, Amit K. ^{[4
]}

Ghosh, Amitava ^{[4
]}

机构：

[1] Indian Inst Technol, Dept Phys, Kanpur 208016, Uttar Pradesh, India

[2] Indian Inst Sci, Mat Res Ctr, Bangalore 560012, Karnataka, India

[3] Tata Inst Fundamental Res, Homi Bhabha Rd, Bombay 400005, Maharashtra, India

[4] DRDO, Instruments Res & Dev Estab, Raipur Rd, Dehra Dun 248008, Uttar Pradesh, India

来源：

OPTICS EXPRESS | 2017年 / 25卷 / 08期

关键词：

D O I：

10.1364/OE.25.009116

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A metamaterial consisting of an array of gold micro-disks, separated from a ground plane of indium tin oxide (ITO) by a thin film of vanadium dioxide (VO2), behaves as a perfect absorber at infrared (IR) frequencies at room temperature. This metamaterial, which is transparent to visible light, can be switched to a highly reflecting state for IR light by heating the metamaterial to temperatures larger than the metal-insulator phase transition temperature 68 degrees C of VO2. For a disk diameter of 1.5 mu m and VO2 film thickness of 320 nm, two absorption bands are obtained: one, that arises from the metamaterial resonance; and a second peak that arises principally from a Fabry-Perot resonance. A large change (> 78%) occurs in the reflectivity between the low and high temperature phases. IR emittance of the metamaterial was measured with IR cameras and shown to be switchable to result in low emittance at high temperature. Optical readout of the state of VO2 within the metamaterial is demonstrated. (C) 2017 Optical Society of America

引用

页码：9116 / 9121

页数：6

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