Thermally switchable metamaterial absorber with a VO2 ground plane

Rameshwari Naorem; Govind Dayal; S. Anantha Ramakrishna; Bharathi Rajeswaran; A. M. Umarji

doi:10.1016/j.optcom.2015.01.075

Thermally switchable metamaterial absorber with a VO₂ ground plane

Rameshwari Naorem
, Govind Dayal
, S. Anantha Ramakrishna
, Bharathi Rajeswaran
, A. M. Umarji

Research output: Contribution to journal › Article › peer-review

68 Scopus citations

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 °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.

Original language	English
Pages (from-to)	154-157
Number of pages	4
Journal	Optics Communications
Volume	346
DOIs	https://doi.org/10.1016/j.optcom.2015.01.075
State	Published - 1 Jul 2015
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

Funding

Funding from DRDO, India , under Grant no. DECS/15/15124/D(R&D)/CARS-1 is gratefully acknowledged.

Funders
Defence Research and Development Organisation

Keywords

Phase change material
Switching
Tunable metamaterial

Access to Document

10.1016/j.optcom.2015.01.075

Cite this

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title = "Thermally switchable metamaterial absorber with a VO2 ground plane",

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 °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.",

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AU - Ramakrishna, S. Anantha

AU - Rajeswaran, Bharathi

AU - Umarji, A. M.

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