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There is need for a high contrast, inexpensive display which has a low writing energy requirement. Use is described of grating effect to increase the contrast of a vanadium dioxide (VO(2)) display.
English (United States)
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High Contrast Visual Display Using Vanadium Dioxide and Grating Effects
There is need for a high contrast, inexpensive display which has a low
writing energy requirement. Use is described of grating effect to increase the
contrast of a vanadium dioxide (VO(2)) display.
Thin films of VO(2) exhibit a change in refractive index at a temperature of
about 60 degrees C. This change of phase can be cycled indefinitely. The phase
change exhibits hysteresis, and a 100 percent useable loop can be obtained, as
illustrated by Fig. 1.
The display uses this property of vanadium oxide and the properties of a
diffraction grating to achieve a display with high contrast. The display includes
three films deposited on a transparent substrate, as illustrated by Fig. 2. Film 1
is a metallic strip grating. Film 2 is a thin metallic film of sufficient thickness to
absorb any light coming from the substrate. Film 3 is a film of vanadium oxide of
suitable thickness (approximately 0.1 micron).
The display described herein is employed as shown in Fig. 3. A
writing laser beam is incident upon the top metallic film. As the
top surface is a grating, the film has a periodic temperature profile
imposed by the writing beam. It is important that the period of this
profile be smaller, e.g., ten times, than any detail to be written by
the writing beam. Thus, a periodic variation in the refractive index
is imposed on the VO(2) film, and light incident upon it will be
diffracted. As only the written p...