Abstract

Vanadium dioxide is known to undergo a first order phase transformation at approximately 67°C. In its low temperature state (T<67°C) VO2 has a monoclinic structure, is semiconductive, and exhibits high transmission of a range of IR wavelengths. At temperatures greater than 67°C VO2 reverts to a tetragonal structure, becomes conductive, and exhibits high reflectance.1 The absorption coefficient of VO2 is relatively high below one micron2 and above thirteen microns3; therefore, changes in the optical properties of VO2 can be used most effectively between these wavelengths.

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