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Title: Thermal tuning of infrared resonant absorbers based on hybrid gold-VO{sub 2} nanostructures

Resonant absorbers based on plasmonic materials, metamaterials, and thin films enable spectrally selective absorption filters, where absorption is maximized at the resonance wavelength. By controlling the geometrical parameters of nano/microstructures and materials' refractive indices, resonant absorbers are designed to operate at wide range of wavelengths for applications including absorption filters, thermal emitters, thermophotovoltaic devices, and sensors. However, once resonant absorbers are fabricated, it is rather challenging to control and tune the spectral absorption response. Here, we propose and demonstrate thermally tunable infrared resonant absorbers using hybrid gold-vanadium dioxide (VO{sub 2}) nanostructure arrays. Absorption intensity is tuned from 90% to 20% and 96% to 32% using hybrid gold-VO{sub 2} nanowire and nanodisc arrays, respectively, by heating up the absorbers above the phase transition temperature of VO{sub 2} (68 °C). Phase change materials such as VO{sub 2} deliver useful means of altering optical properties as a function of temperature. Absorbers with tunable spectral response can find applications in sensor and detector applications, in which external stimulus such as heat, electrical signal, or light results in a change in the absorption spectrum and intensity.
Authors:
 [1] ;  [2] ; ;  [1] ;  [1] ;  [2] ; ;  [3] ;  [4]
  1. Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208 (United States)
  2. (Turkey)
  3. Department of Materials Science and Engineering, University of California Berkeley, Berkeley, California 94720 (United States)
  4. School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287 (United States)
Publication Date:
OSTI Identifier:
22398917
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; ABSORPTION SPECTRA; FILTERS; GOLD; HEAT; METAMATERIALS; MICROSTRUCTURE; NANOSTRUCTURES; PHASE CHANGE MATERIALS; PHASE TRANSFORMATIONS; REFRACTIVE INDEX; SENSORS; SPECTRAL RESPONSE; TEMPERATURE DEPENDENCE; THIN FILMS; TRANSITION TEMPERATURE; VANADIUM OXIDES; VISIBLE RADIATION