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 journalArticlepeer-review

58 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 languageEnglish
Pages (from-to)154-157
Number of pages4
JournalOptics Communications
Volume346
DOIs
StatePublished - 1 Jul 2015
Externally publishedYes

Bibliographical note

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

Keywords

  • Phase change material
  • Switching
  • Tunable metamaterial

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