Ferroelectric liquid-crystal modulator with large switching rotation angle for polarization-independent binary phase modulation

Nabadda, Esther; Bennis, N.; Czerwiński, Michał; Kalbarczyk, A.; Jaroszewicz, Leszek R.; Sánchez-López, Marı́a del Mar; Moreno, Ignacio

doi:10.1016/j.optlaseng.2022.107204

Cited by 9 publications

(9 citation statements)

References 35 publications

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“…In the linear region, before the helix breaking point, the effective optical axis rotates in a limited range, corresponding to insu cient phase depth. This is also one of the reasons that most of the FLC can only achieve amplitude modulation and binary phase modulation 31 . The change of effective birefringence in nonlinear region destroys the diffraction e ciency and induces the change of polarization state, which is also contribute to the ellipticity modulation of the impinging light.…”

Section: Resultsmentioning

confidence: 99%

“…However, the NLCs can only achieve low-frequency phase modulations due to its slow switching time, typically < 180 Hz 28 . The LCoS using Surface Stabilized Ferroelectric Liquid Crystal (SSFLCoS) usually provides fast (~10 kHz) 29,30 , with only binary phase modulation [31][32]33 .…”

Section: Introductionmentioning

confidence: 99%

“…The variation of the retardation limits the multi-phase level and phase modulation depth. Furthermore, the phase modulation depth depends on the rotation cone of the DHFLC optical axis, and the required cone angle of FLC should be close to 90 º , which usually increases the rotational viscosity and limits the response time of the FLC 31 .…”

Section: Introductionmentioning

confidence: 99%

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Reconfigurable Geometrical Phase Spatial Light Modulator Using Short-Pitch Ferroelectric Liquid Crystals

Srivast

Sun

Yuan

et al. 2023

Preprint

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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).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reconfigurable Geometrical Phase Spatial Light Modulator Using Short-Pitch Ferroelectric Liquid Crystals

Srivast

Sun

Yuan

et al. 2023

Preprint

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“…In 2022, Nabadda et al proposed an optimized binary phase modulation using the SSFLC mode. [18] Kotova, S. P. et al proposed a continuous phase modulation by using DHFLC while the cell gap is ≈50 μm for visible light, for which the alignment quality and FFE are not studied in detail. [19] In this article, a fast continuous 1.9𝜋 geometrical phase modulator based on the dynamic rotation of the short-pitch FLC is proposed.…”

Section: Bottlenecksmentioning

confidence: 99%

“…proposed an optimized binary phase modulation using the SSFLC mode. [ 18 ] Kotova, S. P. et al. proposed a continuous phase modulation by using DHFLC while the cell gap is ≈50 µm for visible light, for which the alignment quality and FFE are not studied in detail.…”

Section: Bottlenecksmentioning

confidence: 99%

Reconfigurable Geometrical Phase Spatial Light Modulator Using Short‐Pitch Ferroelectric Liquid Crystals

Sun,

Yuan,

Swaminathan

et al. 2023

Advanced Optical Materials

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This article presents an approach to achieve a fast and analog geometrical phase modulation based on the optical axis rotation of the defect‐free Deformed Helix Ferroelectric Liquid Crystal (DHFLC) with a short pitch. This study demonstrates a Spatial Light Modulator (SLM) prototype with a feature size of 3 µm without Fringe Field Effect (FFE), having a phase depth of 1.9π, fast switching time (<250 µs) at a low operating voltage (<7 V), and high diffraction efficiency (>77%). The high phase modulation depth is achieved by developing DHFLC with a cone angle of up to 85˚, which is inherently immune to FFE. The ellipticity is minimized by using a compensation film that can suppress the changes in birefringence under the applied electric field. The proposed SLM is promising in applications such as a real‐time hologram and dynamic beam steering in Light Ranging and Detector (LiDAR).

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Advanced Applications of Liquid Crystals

Singh

2024

Handbook of Liquid Crystals—Volume II

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Ferroelectric liquid-crystal modulator with large switching rotation angle for polarization-independent binary phase modulation

Cited by 9 publications

References 35 publications

Reconfigurable Geometrical Phase Spatial Light Modulator Using Short-Pitch Ferroelectric Liquid Crystals

Reconfigurable Geometrical Phase Spatial Light Modulator Using Short-Pitch Ferroelectric Liquid Crystals

Reconfigurable Geometrical Phase Spatial Light Modulator Using Short‐Pitch Ferroelectric Liquid Crystals

Advanced Applications of Liquid Crystals

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