2019
DOI: 10.1080/02678292.2019.1573327
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Fast switching beam steering based on ferroelectric liquid crystal phase shutter and polarisation grating

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Cited by 22 publications
(5 citation statements)
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“…The measured switching on time of the LC 2D PGs with a 4 μm cell gap is 24.8 ms, which agrees well with the estimated response time of ∼30 ms calculated based on the viscoelastic coefficient of LC E7 (∼20 ms/μm 2 at T = 22 °C) . To further improve the switching speed of the LC 2D PGs at the operating temperature, on the one hand, the cell gap can be reduced to an optimized value; on the other hand, fast-response LC materials such as blue phase LCs , and ferroelectric LCs can be adopted. Besides, other functions can be endowed by selecting different LC materials, such as broad-band high-efficiency modulation realized by cholesteric LCs, , broadening the application range of the LC 2D PGs.…”
Section: Results and Discussionsupporting
confidence: 82%
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“…The measured switching on time of the LC 2D PGs with a 4 μm cell gap is 24.8 ms, which agrees well with the estimated response time of ∼30 ms calculated based on the viscoelastic coefficient of LC E7 (∼20 ms/μm 2 at T = 22 °C) . To further improve the switching speed of the LC 2D PGs at the operating temperature, on the one hand, the cell gap can be reduced to an optimized value; on the other hand, fast-response LC materials such as blue phase LCs , and ferroelectric LCs can be adopted. Besides, other functions can be endowed by selecting different LC materials, such as broad-band high-efficiency modulation realized by cholesteric LCs, , broadening the application range of the LC 2D PGs.…”
Section: Results and Discussionsupporting
confidence: 82%
“…As an important kind of optical element, gratings have been playing key roles in multidisciplinary areas such as serving as spectrometers in physics or chemistry and wavelength division multiplexing devices in optical communication or LiDAR. , To improve the diffraction efficiency, one-dimensional (1D) polarization gratings (PGs) were proposed, which feature a periodically and linearly varying optical axis distribution and can reach 100% diffraction efficiency theoretically, with ±1st orders being orthogonally circularly polarized and polarization controllable . The use of liquid crystals (LCs) and the development of photoalignment technology further promote the study of 1D PGs, , inspiring a variety of applications like the measurement of the holo-information of a light field, beam steering, , a high-transmittance holographic polarizer, augmented reality/virtual reality (AR/VR) displays, and even observation of the optical force . Meanwhile, research on LC two-dimensional (2D) PGs has gradually emerged.…”
Section: Introductionmentioning
confidence: 99%
“…ESH mode can be applied as fast response shutters for amplitude, phase and polarization modulation. For instance, ESH plate sandwiched between polarizer and quarter wave plate acts as a polarization selector of two orthogonal circular polarizations with sub-millisecond response, which can be placed before passive polarization gratings for fast beam steering purpose, as shown in Figure 18(a-d) [42]. The switching time for beam steering achieved is below 100 μs with voltage within 10 V as shown in Figure 19.…”
Section: Fast Shutter With High Contrast Ratiomentioning
confidence: 99%
“…FLC cell [19,20] can be regarded as an active waveplate with a reconfigurable optical axis, which can realize the consistent phase modulation for two polarization states [21,22]. In addition, FLC materials have a fast response capability [23,24], which is very essential for beam control [25]. As a new type of FLC material, ESHFLC has great alignment quality and a low unwinding threshold voltage, which has proven its possibility for PG and PB lens applications [26].…”
Section: Introductionmentioning
confidence: 99%