Diffraction based phase compensation method for phase-only liquid crystal on silicon devices in operation

Zhang, Zichen; Yang, Haining; Robertson, Brian; Redmond, M.M.; Pivnenko, Mike; Collings, N.; Crossland, W. A.; Chu, Daping

doi:10.1364/ao.51.003837

Cited by 40 publications

(23 citation statements)

References 21 publications

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“…Note that background noise components are mainly caused by the incomplete compensation of nonideal optical responses, such as the nonlinear phase modulation for input gray level and the spatial phase nonuniformity . The desired linear phase modulation characteristic can be obtained by the sophisticated tuning of the input voltage values with respect to the input gray levels.…”

Section: Resultsmentioning

confidence: 99%

Evolution of spatial light modulator for high‐definition digital holography

Choi

Hwang

et al. 2019

ETRI Journal

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Since the late 20th century, there has been rapid development in the display industry. Only 30 years ago, we used big cathode ray tube displays with poor resolution, but now most people use televisions or smartphones with very high‐quality displays. People now want images that are more realistic, beyond the two‐dimensional images that exist on the flat screen, and digital holography—one of the next‐generation displays—is expected to meet that need. The most important parameter that determines the performance of a digital hologram is the pixel pitch. The smaller the pixel pitch, the higher the level of hologram implementation possible. In this study, we fabricated the world‐smallest 3‐μm‐pixel‐pitch holographic backplane based on the spatial light modulator technology. This panel could display images with a viewing angle of more than 10°. Furthermore, a comparative study was conducted on the fabrication processes and the corresponding holographic results from the large to the small pixel‐pitch panels.

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Section: Resultsmentioning

confidence: 99%

Evolution of spatial light modulator for high‐definition digital holography

Choi

Hwang

et al. 2019

ETRI Journal

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“…Besides the linear phase response in all gray scales, another issue is the phase precision over the entire active area. Phase precision has been discussed in many different forms, such as "spatially varying phase response" (SVPR) [46], "spatially resolved phase response" (SRPR) [47], "multipoint phase modulation" [48][49][50][51], "uniformity metrology" [52][53][54][55], "wavefront distortion" [56], "optical flatness", etc. The phase precision quality of an LCoS-SLM panel can be defined by using the above-mentioned evaluation methods.…”

Section: Phase Precisionmentioning

confidence: 99%

Pursuing High Quality Phase-Only Liquid Crystal on Silicon (LCoS) Devices

et al. 2018

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Fine pixel size and high-resolution liquid crystal on silicon (LCoS) backplanes have been developed by various companies and research groups since 1973. The development of LCoS is not only beneficial for full high definition displays but also to spatial light modulation. The high-quality and well-calibrated panels can project computer generated hologram (CGH) designs faithfully for phase-only holography, which can be widely utilized in 2D/3D holographic video projectors and components for optical telecommunications. As a result, we start by summarizing the current status of high-resolution panels, followed by addressing issues related to the driving frequency (i.e., liquid crystal response time and hardware interface). LCoS panel qualities were evaluated based on the following four characteristics: phase linearity control, phase precision, phase stability, and phase accuracy.A phase-only spatial light modulator can be used as a key optical element for displays, adaptive optics for sensing, lithography, and telecommunication, as shown in Figure 2. The linearity of phase modulation, response time, phase precision, and phase stability are key characteristics for appraising or selecting phase-only LCoS-SLM panels for the applications designed. However, it is difficult to obtain a single LCoS possessing all the desired features for all applications. Their specification and performance optimization are application-driven. For example, response time is the current limitation in a holographic display. It may be more important than phase stability,

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“…Then, by controlling the birefringence of the LC molecule electrically, the phase delay of the incident beam is adjusted. However this process needs to be carefully characterized [24][25][26][27] (see Phase Flicker in Section 2.2.1, where one characterization method related to the flicker measurement function is introduced to the reader). The following equation shows how the phase of light is being modulated by a parallel aligned nematic LCoS SLM (GAEA device):…”

Section: Analysis On Lcos For the Wss Systemmentioning

confidence: 99%

LCoS SLM Study and Its Application in Wavelength Selective Switch

et al. 2017

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Abstract:The Liquid-Crystal on Silicon (LCoS) spatial light modulator (SLM) has been used in wavelength selective switch (WSS) systems since the 1990s. However, most of the LCoS devices used for WSS systems have a pixel size larger than 6 µm. Although there are some negative physical effects related to smaller pixel sizes, the benefits of more available ports, larger spatial bandwidth, improved resolution, and the compactness of the whole system make the latest generation LCoS microdisplays highly appealing as the core component in WSS systems. In this review work, three specifications of the WSS system including response time, crosstalk and insertion loss, and optimization directions are discussed. With respect to response time, the achievements of liquid crystal material are briefly surveyed. For the study of crosstalk and insertion loss, related physical effects and their relation to the crosstalk or insertion loss are discussed in detail, preliminary experimental study for these physical effects based on a small pixel LCoS SLM device (GAEA device, provided by Holoeye, 3.74 µm pixel pitch, 10 megapixel resolution, telecom) is first performed, which helps with predicting and optimizing the performance of a WSS system with a small pixel size SLM. In the last part, the trend of LCoS devices for future WSS modules is discussed based on the performance of the GAEA device. Tradeoffs between multiple factors are illustrated. In this work, we present the first study, to our knowledge, of the possible application of a small pixel sized SLM as a switching component in a WSS system.

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Diffraction based phase compensation method for phase-only liquid crystal on silicon devices in operation

Cited by 40 publications

References 21 publications

Evolution of spatial light modulator for high‐definition digital holography

Evolution of spatial light modulator for high‐definition digital holography

Pursuing High Quality Phase-Only Liquid Crystal on Silicon (LCoS) Devices

LCoS SLM Study and Its Application in Wavelength Selective Switch

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