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

Pradhan, Jitendra and Ramakrishna, Anantha S and Rajeswaran, Bharathi and Umarji, Arun M and Achanta, Venu Gopal and Agarwal, Amit K and Ghosh, Amitava (2017) High contrast switchability of VO2 based metamaterial absorbers with ITO ground plane. In: OPTICS EXPRESS, 25 (8). pp. 9116-9121.

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Official URL: http://dx.doi.org/10.1364/OE.25.009116


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

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the OPTICAL SOC AMER, 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 03 Jun 2017 09:41
Last Modified: 18 Feb 2019 10:31
URI: http://eprints.iisc.ac.in/id/eprint/57108

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