Study and validation of switchable grating using liquid crystal for active waveguide addressing

Salaheddine Toubi; Matthias Colard; Yann Lee; Benoit Racine; Aurelien Suhm; David Grosso; Badre Kerzabi; Christophe Martinez

doi:10.1117/12.2649749

14 March 2023 Study and validation of switchable grating using liquid crystal for active waveguide addressing

Salaheddine Toubi, Matthias Colard, Yann Lee, Benoit Racine, Aurelien Suhm, David Grosso, Badre Kerzabi, Christophe Martinez

Author Affiliations +

Proceedings Volume 12442, Emerging Liquid Crystal Technologies XVIII; 124420B (2023) https://doi.org/10.1117/12.2649749
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

In our Augmented Reality (AR) project, we are investigating the use of a retinal projection display based on the association of pixelated holograms and a dense distribution of waveguides. We study the use of gratings impregnated with liquid crystal to actively extract light from waveguides. We explore two extraction strategies: tuning the refractive index contrast between the grating teeth and grooves to erase the grating diffraction effect and changing the index of the waveguide cladding to tune the evanescence of the guided mode. Firstly, we present and discuss the measurements of the diffraction efficiency of nano-imprint gratings impregnated with liquid crystal and refractive liquid index. Secondly, we discuss the results of integrated switchable extraction grating of the second strategy.

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Citation Download Citation

Salaheddine Toubi, Matthias Colard, Yann Lee, Benoit Racine, Aurelien Suhm, David Grosso, Badre Kerzabi, and Christophe Martinez "Study and validation of switchable grating using liquid crystal for active waveguide addressing", Proc. SPIE 12442, Emerging Liquid Crystal Technologies XVIII, 124420B (14 March 2023); https://doi.org/10.1117/12.2649749

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