LC-based Phase-modulating Spatial Light Modulators

Hermerschmidt, Andreas; Lazarev, Grigory; Rozhkov, Oleg V.

doi:10.1364/dh.2014.dw1b.2

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…In theory, digital driving is not suitable for phase-only LCoS because phase information cannot be averaged with an RMS value. In practice, phase flickering has been suppressed to an acceptable level [103]. Jointly with its merits of fast response time, high repeatability and good phase vs. gray level linearity, digital driving is widely adopted in commercial phase-only LCoS devices [104].…”

Section: Response Timementioning

confidence: 99%

Liquid-Crystal-on-Silicon for Augmented Reality Displays

Huang

Liao²,

Chen

et al. 2018

Applied Sciences

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In this paper, we review liquid-crystal-on-silicon (LCoS) technology and focus on its new application in emerging augmented reality (AR) displays. In the first part, the LCoS working principles of three commonly adopted LC modes—vertical alignment and twist nematic for amplitude modulation, and homogeneous alignment for phase modulation—are introduced and their pros and cons evaluated. In the second part, the fringing field effect is analyzed, and a novel pretilt angle patterning method for suppressing the effect is presented. Moreover, we illustrate how to integrate the LCoS panel in an AR display system. Both currently available intensity modulators and under-developing holographic displays are covered, with special emphases on achieving high image quality, such as a fast response time and high-resolution. The rapidly increasing application of LCoS in AR head-mounted displays and head-up displays is foreseeable.

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Section: Response Timementioning

confidence: 99%

Liquid-Crystal-on-Silicon for Augmented Reality Displays

Huang

Liao²,

Chen

et al. 2018

Applied Sciences

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“…In recent years, liquid crystal on silicon (LCoS) [1,2] displays have become the most attractive micro-displays for all sorts of spatial light modulation (SLM) applications, as in diffractive optics [3], optical storage [4], optical metrology [5], reconfigurable interconnects [6,7], quantum optical computing [8], and wave shaper technology for optical signal processing and signal monitoring [9], thanks to their very high spatial resolution, very high light efficiency, and their phase-only modulation capability [10,11]. In this article, we focus on the characteristics of LCoS SLM for wavelength selective switch (WSS) systems used in reconfigurable optical add/drop multiplexers (ROADM) in wavelength division multiplexed (WDM) optical networks.…”

Section: Introductionmentioning

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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LC-based Phase-modulating Spatial Light Modulators

Cited by 2 publications

References 3 publications

Liquid-Crystal-on-Silicon for Augmented Reality Displays

Liquid-Crystal-on-Silicon for Augmented Reality Displays

LCoS SLM Study and Its Application in Wavelength Selective Switch

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