Special Issue on Liquid Crystal on Silicon Devices: Modeling and Advanced Spatial Light Modulation Applications

Márquez, Andrés; Lizana, Ángel

doi:10.3390/app9153049

Cited by 8 publications

(7 citation statements)

References 19 publications

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“…An LCOS device can be either transmissive or reflective and can be used to alter the polarization or the phase of an incident coherent light beam [11]. The reflective LCoS are composed of a silicon complementary metal-oxide semiconductor (CMOS) backplane, which controls the liquid crystal layer's light modulating properties [12].…”

Section: Virtual Conference 30 March-2 April 2021mentioning

confidence: 99%

Characterization of liquid crystal on silicon-SLMs for in-situ laser beam steering to enable RAMAN imaging

Ritter¹,

Augustin²,

Börner³

et al. 2021

International Conference on Space Optics — ICSO 2020

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In the future, the use of lunar regolith for resource extraction and manufacturing of construction materials will play a significant role in lunar exploration projects. Raman spectroscopy can contribute to the quality control of materials made of moon regolith. To improve system reliability in Raman point mapping it is proposed to use dynamic light shaping to reduce the risk of thermal and mechanical damage. An approach to characterize a Liquid Crystal on Silicon (LCoS) Spatial Light Modulator (SLM) is shown. For this purpose, influence parameters are identified and evaluated with the help of a laboratory setup and a complementary simulation in order to evaluate the possibilities and limitations of Raman raster point mapping in respect to the deflection and spot shaping.

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Section: Virtual Conference 30 March-2 April 2021mentioning

confidence: 99%

Characterization of liquid crystal on silicon-SLMs for in-situ laser beam steering to enable RAMAN imaging

Ritter¹,

Augustin²,

Börner³

et al. 2021

International Conference on Space Optics — ICSO 2020

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“…The widespread use of parallel-aligned liquid crystal on silicon (PA-LCoS) microdisplays in modern spatial light modulation applications [1]- [3] in optics and photonics, has stimulated the development of models and characterization techniques by many groups. These techniques can be generally classified as diffractive, interferometric and polarimetric [4]- [11] .…”

Section: Introductionmentioning

confidence: 99%

Voltage dependence of retardance, flicker, and director angle orientation in reflective liquid crystal devices by average Stokes polarimetry

Márquez

Martínez-Guardiola

Morales-Vidal

et al. 2021

Optics and Photonics for Information Processing XV

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Parallel-aligned liquid crystal on silicon devices (PA-LCoS) can be found nowadays in most of the advanced areas in optics and photonics. Many works have been dedicated to their characterization for optimum utilization in applications. However, usual techniques are based on diffractive or interferometric measurements. Recently, we proposed the use of Stokes polarimetry for a versatile yet easy to implement characterization. We show that the LCoS can modelled as a nonabsorbent reciprocal device which, combined with time-average Stokes polarimetry, enables to demonstrate robust measurements across the whole applied voltage range for the retardance and its flicker. One of the main novelties is that we also obtain the director orientation, which we show that changes across the voltage range, especially at larger applied voltages. This might affect in very sensitive applications. It might also provide a deeper insight into the internal dynamics in the LC layer.

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“…Phase-only elements are usually preferable since light loss is a major concern in most of the applications. Parallel-aligned liquid-crystal on silicon (PA-LCoS) microdisplays [4]- [6] are typically the SLM technology of choice due to their very large resolution and because they enable phase-only operation without coupled amplitude modulation.…”

Section: Introductionmentioning

confidence: 99%

Blazed grating theory to minimize the non-idealities in LCoS devices

Márquez

Martínez-Guardiola

Francés

et al. 2019

Optics and Photonics for Information Processing XIII

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Parallel-aligned liquid crystal on silicon (PA-LCoS) microdisplays are widely used in spatial light modulation applications, especially in those requiring phase-only modulation. One such application area is programmable diffractive optics which plays a very important role in modern optical imaging systems or in optical interconnections for optical telecommunications. Among the multilevel diffractive optical elements (DOEs) we focus on the important case of the blazed gratings. We develop the corresponding analytical expressions for the diffracted field where, as one of the novelties in the work, an analytical expression including the fill factor and the flicker is obtained. This enables to have a model against to compare the experimental results in a number of situations where fill factor, flicker, period, and number of quantization levels are the variables. This also enables to design appropriate compensation techniques to enhance the performance of the blazed gratings.

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Special Issue on Liquid Crystal on Silicon Devices: Modeling and Advanced Spatial Light Modulation Applications

Abstract: Since the first liquid crystal displays (LCDs) at the beginning of the seventies—based on the twisted-nematic cell configuration [...]

Cited by 8 publications

References 19 publications

Characterization of liquid crystal on silicon-SLMs for in-situ laser beam steering to enable RAMAN imaging

Characterization of liquid crystal on silicon-SLMs for in-situ laser beam steering to enable RAMAN imaging

Voltage dependence of retardance, flicker, and director angle orientation in reflective liquid crystal devices by average Stokes polarimetry

Blazed grating theory to minimize the non-idealities in LCoS devices

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