期刊
APPLIED PHYSICS LETTERS
卷 106, 期 16, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4918938
关键词
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资金
- Materials Research Science and Engineering Center (NSF-MRSEC) of Northwestern University [DMR-1121262]
- McCormick School of Engineering and Applied Sciences at Northwestern University
- AFOSR [FA9550-12-1-0280]
- Institute for Sustainability and Energy at Northwestern (ISEN) through ISEN Booster Award
- NSF CAREER Award [DMR-1055938]
- Scientific and Technological Research Council of Turkey (TUBITAK)
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- NUFAB cleanroom facility at Northwestern University
- Direct For Mathematical & Physical Scien [1055938] Funding Source: National Science Foundation
- Division Of Materials Research [1055938] Funding Source: National Science Foundation
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 (VO2) nanostructure arrays. Absorption intensity is tuned from 90% to 20% and 96% to 32% using hybrid gold-VO2 nanowire and nanodisc arrays, respectively, by heating up the absorbers above the phase transition temperature of VO2 (68 degrees C). Phase change materials such as VO2 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. (C) 2015 AIP Publishing LLC.
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