Optimizing the diffraction efficiency of SLM-based holography with respect to the fringing field effect

Lingel, Christian; Haist, Tobias; Osten, Wolfgang

doi:10.1364/ao.52.006877

Cited by 58 publications

(36 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Probably the different exchange of energy between replicas when changing the image being addressed onto the LCoS is due to the pixel crosstalk caused by the fringing fields, i.e., the gradual voltage changes across the border of neighboring pixels and by elastic forces in the liquid-crystal material preventing abrupt spatial variations in the phase modulation [30][31][32][33]. Both effects cause the realized phase modulation of a pixel to depend also on the voltage applied over adjacent pixels.…”

Section: Numerical and Experimental Realization: Blazed Gratingsmentioning

confidence: 99%

Predictive capability of average Stokes polarimetry for simulation of phase multilevel elements onto LCoS devices

et al. 2015

View full text Add to dashboard Cite

Parallel-aligned (PA) liquid-crystal on silicon (LCoS) microdisplays are especially appealing in a wide range of spatial light modulation applications since they enable phase-only operation. Recently we proposed a novel polarimetric method, based on Stokes polarimetry, enabling the characterization of their linear retardance and the magnitude of their associated phase fluctuations or flicker, exhibited by many LCoS devices. In this work we apply the calibrated values obtained with this technique to show their capability to predict the performance of spatially varying phase multilevel elements displayed onto the PA-LCoS device. Specifically we address a series of multilevel phase blazed gratings. We analyze both their average diffraction efficiency ("static" analysis) and its associated time fluctuation ("dynamic" analysis). Two different electrical configuration files with different degrees of flicker are applied in order to evaluate the actual influence of flicker on the expected performance of the diffractive optical elements addressed. We obtain a good agreement between simulation and experiment, thus demonstrating the predictive capability of the calibration provided by the average Stokes polarimetric technique. Additionally, it is obtained that for electrical configurations with less than 30°amplitude for the flicker retardance, they may not influence the performance of the blazed gratings. In general, we demonstrate that the influence of flicker greatly diminishes when the number of quantization levels in the optical element increases.

show abstract

Section: Numerical and Experimental Realization: Blazed Gratingsmentioning

confidence: 99%

Predictive capability of average Stokes polarimetry for simulation of phase multilevel elements onto LCoS devices

et al. 2015

View full text Add to dashboard Cite

show abstract

“…As we explained in [21] , probably the different exchange of energy between replicas when changing the image being addressed onto the LCoS is due to the pixel crosstalk caused by the fringing fields, i.e. the gradual voltage changes across the border of neighboring pixels, and by elastic forces in the LC material preventing abrupt spatial variations in the phase modulation [27] [28] . Both effects cause the realized phase modulation of a pixel to depend also on the voltage applied over adjacent pixels.…”

Section: Blazed Gratings: Experimentsmentioning

confidence: 98%

Static and dynamic effects of flicker in phase multilevel elements on LCoS devices

et al. 2015

View full text Add to dashboard Cite

Phase-only modulation is necessary in a great number of modern spatial light modulation applications, and the spatial light modulator (SLM) technology of choice is usually the parallel-aligned liquid crystal on silicon (PA-LCoS) microdisplay. Various degradation effects have been analyzed in the literature which may be introduced by SLMs and whose quantitative knowledge enables to select the best working conditions and/or to design specific compensation strategies to diminish negative effects. In this paper we concentrate on the phase flicker typically produced by PA-LCoS devices. The availability of a recent polarimetric-based method, the average Stokes polarimetric technique, to measure the linear retardance and its flicker amplitude eases the capability to simulate the performance of spatially varying phase multilevel elements typically addressed onto PA-LCoS devices. A representative element is the blazed grating. Recently we demonstrated the capability of the calibration provided by the average Stokes polarimetric technique to predict the performance of blazed gratings, both their average diffraction efficiency, static analysis, and its associated time fluctuation, dynamic analysis. In the present work we take advantage of the demonstrated predictive capability of our approach to analyse to find the wide range of applicability of PA-LCoS devices in applications in spite of flicker.

show abstract

“…The near field optimization method provides a more direct and accurate measurement. Similar near field approaches [61] are also proposed by measuring the sub-pixel Jones matrices and modeling the fringing field effect as a low pass filter. In order to compensate for the diffraction efficiency reduction of the blazed grating due to the fringing field effect, a voltage profile optimization method has been verified using rigorous numerical simulation software for liquid crystal devices by X. Wang et al [62,63].…”

Section: Fringing Field Effectmentioning

confidence: 99%

LCoS SLM Study and Its Application in Wavelength Selective Switch

et al. 2017

View full text Add to dashboard Cite

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.

show abstract

Optimizing the diffraction efficiency of SLM-based holography with respect to the fringing field effect

Cited by 58 publications

References 30 publications

Predictive capability of average Stokes polarimetry for simulation of phase multilevel elements onto LCoS devices

Predictive capability of average Stokes polarimetry for simulation of phase multilevel elements onto LCoS devices

Static and dynamic effects of flicker in phase multilevel elements on LCoS devices

LCoS SLM Study and Its Application in Wavelength Selective Switch

Contact Info

Product

Resources

About