| Autor: |
García de Blas, Mario, Geday, Morten Andreas, Otón, Jose Manuel, Quintana Arregui, Xabier, Ting, Ye Zhi |
| Předmět: |
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| Zdroj: |
Applied Sciences (2076-3417); Apr2021, Vol. 11 Issue 8, p3632, 12p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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