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Title: Thermal self-oscillations in radiative heat exchange

We report the effect of relaxation-type self-induced temperature oscillations in the system of two parallel plates of SiO{sub 2} and VO{sub 2} which exchange heat by thermal radiation in vacuum. The non-linear feedback in the self-oscillating system is provided by metal-insulator transition in VO{sub 2}. Using the method of fluctuational electrodynamics, we show that under the action of an external laser of a constant power, the temperature of VO{sub 2} plate oscillates around its phase transition value. The period and amplitude of oscillations depend on the geometry of the structure. We found that at 500 nm vacuum gap separating bulk SiO{sub 2} plate and 50 nm thick VO{sub 2} plate, the period of self-oscillations is 2 s and the amplitude is 4 K, which is determined by phase switching at threshold temperatures of phase transition.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Department of Materials and Nano Physics, School of Information and Communication Technology, KTH Royal Institute of Technology, Electrum 229, 16440 Kista (Sweden)
  2. State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, 310027 Hangzhou (China)
  3. (Sweden)
Publication Date:
OSTI Identifier:
22412638
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 6; 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; ELECTRODYNAMICS; FEEDBACK; HEAT; HEAT TRANSFER; IRRADIATION; LASER RADIATION; NONLINEAR PROBLEMS; OSCILLATIONS; PHASE TRANSFORMATIONS; RELAXATION; SILICON OXIDES; THERMAL RADIATION; VANADIUM OXIDES