Fast and low loss flexoelectro-optic liquid crystal phase modulator with a chiral nematic reflector

Wang, Xiuze; Fells, Julian A. J.; Yip, W.C.; Ali, Taimoor; Lin, James T.; Welch, Chris; Mehl, Georg H.; Booth, Martin J.; Wilkinson, Timothy D.; Morris, Stephen M.; Elston, Steve J.

doi:10.1038/s41598-019-42831-5

Cited by 8 publications

(2 citation statements)

References 29 publications

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“…On the other hand, there are modulators based on Liquid Crystals (LC). These modulators are tuneable with highly exible patterns [20][21][22] . LC SLMs use LC's ability to respond to external stimuli, mostly applied electric elds.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Srivast

Sun

Yuan

et al. 2023

Preprint

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“…It is even faster for CB7CB and CB11CB dimers and it lies in the submicrosecond range [3,4,6] as compared to the millisecond range for uniaxial nematics. The study of the field-induced distortional effects in the NTB phase may be extremely useful for technological applications due to an analogy of the observed response with the electro-clinic effect [4,42,43,44,45,46] of SmA. In the NTB phase, the effect of the electric field can be observed through both strong dielectric as well as weak flexoelectric couplings [47,48,49].…”

Section: Introductionmentioning

confidence: 99%

Dielectric response of electric-field distortions of the twist-bend nematic phase for LC dimers

Merkel

Welch

Ahmed

et al. 2019

The Journal of Chemical Physics

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Wide band dielectric spectroscopy of bent-shaped achiral liquid-crystal dimers 1-n-bis(4cyanobiphenyl-4-yl) n-alkanes (CBnCB n=7,9,11) have been investigated in a frequency range 0.1 Hz to 100 MHz using planar-aligned cells of sample thicknesses ranging from 2 to 10 (m) over a temperature range that covers both nematic and twist bend nematic phases.Two peaks in the dielectric spectrum in the higher frequency range are assigned to the molecular relaxation processes. The peak at the highest frequency, ~ 40 to 80 MHz, is assigned to an internal precessional rotation of a single unit of the dimer around the director.The mode in the next lower frequency range of 2 to 10 MHz is assigned to the spinning rotation of the dimer around its long axis. This involves fluctuations of the dipole moment of the bent-shaped conformation that is directed along its arrow direction of the bow shape formed by the dimer. The peak in the frequency range 100 kHz to 1 MHz can be assigned to the collective fluctuations of the local director with reference to the helical axis of the NTB structure. The dependence of its frequency on temperature is reminiscent of the soft mode observed at the SmA* to SmC* phase transition. This result clearly corresponds to the electroclinic effectthe response of the director to the applied electric field in an electro-optic experiment. The lowest frequency mode, observed in frequency range of 0.1 Hz -100 Hz, is identified with the Goldstone mode. This mode is concerned with the long range azimuthal angle fluctuations of the local director. This leads to an alternating compression and expansion of the periodic structure of the NTB phase.

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A Compact Full 2π Flexoelectro‐Optic Liquid Crystal Phase Modulator

Wang

Fells

Shi

et al. 2020

Adv Materials Technologies

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Fast and low loss flexoelectro-optic liquid crystal phase modulator with a chiral nematic reflector

Cited by 8 publications

References 29 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

Dielectric response of electric-field distortions of the twist-bend nematic phase for LC dimers

A Compact Full 2π Flexoelectro‐Optic Liquid Crystal Phase Modulator

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