Effects of phase flicker in digitally driven phase-only LCOS devices on holographic reconstructed images

Tong, Yuan; Pivnenko, Mike; Chu, Daping

doi:10.1364/ao.442644

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…LCoS plays a dominant role in SLMs [19] and it has been used in a wide range of applications such as wavelength selective switch (WSS) [20], head-up displays (HUDs) and smart glasses. Conventional LCoS SLM is facing challenges in response time, phase flickers [21], resolution etc., which potentially can be addressed by specially designed subwavelength metasurfaces. Therefore, we envisage that meta-LCoS will be a leading candidate for the nextgeneration LCoS devices.…”

Section: Introductionmentioning

confidence: 99%

Phase shift of liquid crystal-induced resonance tuning in dielectric metasurface at telecommunication wavelength

Chang

Pivnenko

Shrestha

et al. 2023

High Contrast Metastructures XII

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During the last decade, active metasurface has attracted significant attention from academia and industry because of its unparalleled advantages over conventional technologies. Active metasurface using electrically controlled liquid crystal (LC) is one of the most promising types of active metasurface towards industrial applications. In this work, we report a silicon metasurface immersed in a nematic liquid crystal for transmission amplitude modulation. Tunable resonance was realized by applying an AC voltage and the resonance was tuned in the spectral range of 1524 nm ~ 1573 nm, which covers the telecommunication C band. The corresponding phase shift at 1555 nm with a maximum value approaching 2π was measured using a Michelson interferometer, which supports the tuning of metasurface resonance by LC. As a result, the maximal modulation depth in transmission amplitude of 94% as experimentally recorded at 1530 nm. In addition, the high quality of LC photoalignment on metasurface was evaluated by examining the transmitted light intensity between crossed polarizers. The response time of sub-milliseconds can be obtained, thanks to the thin cell thickness of only 1 μm. The high alignment quality and fast response time demonstrated in this work shows a promising future for metasurface-integrated liquid crystal on silicon (meta-LCoS) spatial light modulators (SLMs), especially for telecommunication applications.

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Section: Introductionmentioning

confidence: 99%

Phase shift of liquid crystal-induced resonance tuning in dielectric metasurface at telecommunication wavelength

Chang

Pivnenko

Shrestha

et al. 2023

High Contrast Metastructures XII

Self Cite

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Phase flicker-induced sharpness deterioration on 2D holographic displays with digitally driven phase-only LCoS devices

Wu¹,

CHANG²,

Pivnenko³

et al. 2023

Appl. Opt.

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Phase flicker in liquid crystal on silicon (LCoS) devices can decrease the effective phase modulation resolution by introducing overlapped phase oscillations between adjacent modulated gray levels, thus degrading the performance of LCoS devices in various applications. However, the effect of phase flicker on a holographic display is often overlooked. From an application angle, this paper investigates the quality of the holographic reconstructed image, especially sharpness, under the static and dynamic effects of different flicker magnitudes. Both the simulation and experimental results reveal that the increment in the magnitude of phase flicker causes an equal sharpness deterioration with the reduction of the numbers of hologram phase modulation levels.

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Implementation of a null test for freeform optics using a high-definition spatial light modulator

Chaudhuri¹,

Wansha²,

Porras-Aguilar³

et al. 2022

Opt. Express

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We report the implementation of an interferometric null test using a high-definition spatial light modulator (SLM) as a reconfigurable alternative to a computer-generated hologram. We detail the alignment process chain, including novel techniques using the SLM to project alignment fiducials on the test part. To validate the alignment protocol, we measure a mild off-axis conic with the SLM-based system and cross-validate with conventional interferometry within 30 nm root-mean-square (RMS) surface figure. Finally, we report the null test of a 65 mm clear aperture concave freeform with 91 μm peak-valley sag departure from the base sphere. The measured surface figure of the freeform is within 40 nm RMS compared to the measurement with a commercial metrology instrument.

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Effects of phase flicker in digitally driven phase-only LCOS devices on holographic reconstructed images

Cited by 4 publications

References 15 publications

Phase shift of liquid crystal-induced resonance tuning in dielectric metasurface at telecommunication wavelength

Phase shift of liquid crystal-induced resonance tuning in dielectric metasurface at telecommunication wavelength

Phase flicker-induced sharpness deterioration on 2D holographic displays with digitally driven phase-only LCoS devices

Implementation of a null test for freeform optics using a high-definition spatial light modulator

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