Affiliation:
1. Hong Kong University of Science and Technology
2. State Key Laboratory of Advanced Displays and Optoelectronics Technologies, Hong Kong University of Science and Technology
3. The Hong Kong University of Science and Technology
Abstract
Abstract
This article shows a fast continuous 2π geometrical phase modulator based on the dynamic optical axis rotation of the short-pitch Ferroelectric Liquid Crystal (FLC). A continuous multi-level (8-bit) phase modulation, fast switching time (< 250 μs at 2 kHz), low operating voltage (< 7 V), and high diffraction efficiency (> 77%) is achieved using defect-free Deformed Helix Ferroelectric Liquid Crystal (DHFLC) for the first time. We showed a minimum feature size of 1 µm without fringe field effect (FFE). We also developed a new FLC with a cone angle of ~85˚ and a way to provide compensated half-wave condition (HW) during the entire electro-optical operational range. As a result, we achieve both spatial and time modulation with high frequency (1/3 μm-1 and 4 kHz, respectively), which can be used in applications such as a real-time hologram and dynamic beam steering in Light Ranging and Detector (LiDAR).
Publisher
Research Square Platform LLC
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