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Article

Two-Dimensional Digital Beam Steering Based on Liquid Crystal Phase Gratings

CEMDATIC, ETSI Telecomunicación, Universidad Politécnica de Madrid, Av. Complutense 30, 28040 Madrid, Spain
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Authors to whom correspondence should be addressed.
Academic Editor: Ye Zhi Ting
Appl. Sci. 2021, 11(8), 3632; https://doi.org/10.3390/app11083632
Received: 24 March 2021 / Revised: 8 April 2021 / Accepted: 13 April 2021 / Published: 17 April 2021
(This article belongs to the Collection Optical Design and Engineering)
Electrically tunable phase gratings are able to steer an incoming light beam without employing movable parts. Here, we present the design and implementation of a 2D beam steering device by cascading two orthogonal 1D liquid crystal (LC) based phase gratings, each having an array of 72 rectangular individually controlled pixels and driven by a custom 12-bit Pulse-Width Modulation (PWM) electrical driver. High-resolution structures in glass wafers coated with transparent Indium-Tin Oxide (ITO) have been prepared using Direct Laser Writing (DLW) techniques. With DLW, a high number of pixels can easily be drawn with an interpixel space of less than 3 μm, leading to devices with a high fill factor. The active area of the cascaded device is 1.1 × 1.1 mm2. We present a 72 × 72 point efficiency map corresponding to a maximum diagonal steering angle of 1.65°. Special attention has been paid to make the device compatible with space application by avoiding electronics in the active area. View Full-Text
Keywords: beam steering; liquid crystal; blaze grating; direct laser witting beam steering; liquid crystal; blaze grating; direct laser witting
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MDPI and ACS Style

García de Blas, M.; Geday, M.A.; Otón, J.M.; Quintana Arregui, X. Two-Dimensional Digital Beam Steering Based on Liquid Crystal Phase Gratings. Appl. Sci. 2021, 11, 3632. https://doi.org/10.3390/app11083632

AMA Style

García de Blas M, Geday MA, Otón JM, Quintana Arregui X. Two-Dimensional Digital Beam Steering Based on Liquid Crystal Phase Gratings. Applied Sciences. 2021; 11(8):3632. https://doi.org/10.3390/app11083632

Chicago/Turabian Style

García de Blas, Mario, Morten A. Geday, Jose M. Otón, and Xabier Quintana Arregui. 2021. "Two-Dimensional Digital Beam Steering Based on Liquid Crystal Phase Gratings" Applied Sciences 11, no. 8: 3632. https://doi.org/10.3390/app11083632

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