Response of thermal filaments in VO2 to laser−produced thermal perturbations

Abstract
The response of thermal filaments in thin films of VO2 to small thermal perturbations induced by a He−Ne laser has been measured. With the aid of additional noise spectrum measurements the senstivity of a planar device with a 127−μ gap between electrodes is estimated to be approximately 0.6×10−9 W/(Hz)1/2 at 40 kHz. These devices appear, therefore, to be attractive as fast thermal detectors and may have applications as elements in high−density arrays. Radiance profiles of a thermal filament are also given.

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