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Erschienen in:
22.12.2016
Highly diffractive, reversibly fast responsive gratings formulated through focused surface acoustic wave for holographic display
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 7/2017
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Abstract
Acoustic-optic (AO) based holographic display unit have been developed through a focused and wide bandwidth surface acoustic wave (SAW). The developed AO device constitutes a laser source, ZnS waveguide layer, Prism, focused and chirp interdigital transducers (IDTs) on 128° YX-LiNbO3 piezoelectric substrate, and a viewing plane. The AO interacted beam’s diffraction angle and intensity is modulated by SAW driving power variations of the focused and chirp IDTs. A maximum diffraction efficiency ~ 73 % is obtained at a center frequency of 400 MHz for focused IDTs. By modulating the power of focused IDT, we can shape an incident light into patterns composed of a series of point sources. Our findings provide a facile approach to build hologram display having wide angle light diffraction and high efficiency performance with focused SAW grating.