Thermally switchable metamaterial absorber with a VO2 ground plane

Naorem, Rameshwari and Dayal, Govind and Ramakrishna, Anantha S and Rajeswaran, Bharathi and Umarji, AM (2015) Thermally switchable metamaterial absorber with a VO2 ground plane. In: OPTICS COMMUNICATIONS, 346 . pp. 154-157.

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Abstract

A tri-layer metamaterial absorber, composed of a metal structure/dielectric spacer/vanadium dioxide (VO2) ground plane, is shown to switch reversibly between reflective and absorptive states as a function of temperature. The VO2 film, which changes its conductivity by four orders of magnitude across a insulator-metal transition at about 68 degrees C, enables the switching by forming a resonant absorptive structure at high temperatures while being inactive at low temperatures. The fabricated metamaterial shows a modulation of the reflectivity levels of 58% at a frequency of 22.5 THz and 57% at a frequency of 34.5 THz. (C) 2015 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	OPTICS COMMUNICATIONS
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords:	Tunable metamaterial; Phase change material; Switching
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	22 May 2015 06:41
Last Modified:	22 May 2015 06:41
URI:	http://eprints.iisc.ac.in/id/eprint/51545

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