High‐Speed and Continuously Tunable Polarization Rotator Using High‐Tilt Electrically Suppressed Helix Ferroelectric Liquid Crystals

The dynamic control of light polarization is crucial for advancing optical and photonic technologies; however, existing polarization rotators often face a performance trade‐off among speed, precision, power efficiency, and system complexity. Liquid crystal‐based solutions, while advantageous in cost and integrability, are typically limited by millisecond‐scale response times. In this work, we overcome these limitations by introducing a high‐performance polarization rotator based on a high‐tilt electrically suppressed helix ferroelectric liquid crystal (HT‐ESHFLC). The device features a simple single‐cell structure yet achieves continuous polarization rotation with a high degree of polarization (>97%), a wide tuning range (82°), microsecond‐scale switching, and ultra‐low power consumption. This performance is attributed to our tailored FLC material with chiral sematic C phase, which exhibits a long pitch, high tilt angle, and large spontaneous polarization. These properties collectively overcome the longstanding challenge of stable phase modulation in conventional deformed‐helix FLC (DHFLC) and in binary working principles of ESHFLC devices. We delineate the design strategy, tracing the evolution from nematic and conventional DHFLCs to our novel HT‐ESHFLC platform. To demonstrate its practical utility, we integrated the rotator with a Pancharatnam‐Berry lens to construct a dynamic augmented reality display capable of rapid intensity modulation between two planes. This work establishes the HT‐ESHFLC as a compelling platform for high‐speed, low‐power polarization modulation, with promising applications in optical communications, LiDAR, and next‐generation displays.