Switchable directional infrared radiation source
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United States of America Patent
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Oct 24, 2017
Grant Date -
Oct 15, 2015
app pub date -
Nov 27, 2013
filing date -
Nov 30, 2012
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Abstract
A source of directional radiation in an IR band comprises at least a substrate and an external layer comprising controllable cells made of a metal insulator transition material that changes phase depending on its temperature relative to a temperature at which the corresponding wavelength is located in the IR band and that possesses a crystalline phase and an amorphous phase, and control means for controlling the phase change of the cells so as to form in this external layer a diffraction grating when the cells are controlled to the amorphous phase, in order thus to obtain a switchable directional source.
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