Characterization of a parallel aligned liquid crystal on silicon and its application on a Shack-Hartmann sensor

Lobato, L.; Márquez, Andrés; Lizana, Ángel; Moreno, Ignacio; Iemmi, Claudio; Campos, Juan

doi:10.1117/12.860816

Cited by 8 publications

(10 citation statements)

References 11 publications

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“…To conduct the LCoS display surface calibration, a digital micro-lens array pattern (Shack-Hartmann scheme [19,20]) is self-addressed to the device. The micro-lens array consists of an ordered lattice of micro diffractive convergent lenses integrated at the LCoS plane.…”

Section: Surface Profile Calibrationmentioning

confidence: 99%

“…Here, the term "self-addressing" means that the used DOEs are addressed to the same LCoS display to be calibrated, this leading to an auto-calibrating procedure. In particular, two DOEs are self-addressed: (1) a split-lens configuration [17,18] to fulfil the phase-voltage calibration; and (2) a spot-array pattern (Shack-Hartmann, S-H, configuration [19][20][21]) to realize the surface profile measurement. For the phase-voltage calibration case, a diffractive two split-lens configuration is addressed on the LCoS, which is illuminated by coherent light.…”

Section: Introductionmentioning

confidence: 99%

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Microparticle Manipulation and Imaging through a Self-Calibrated Liquid Crystal on Silicon Display

et al. 2018

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We present in this paper a revision of three different methods we conceived in the framework of liquid crystal on silicon (LCoS) display optimization and application. We preliminarily demonstrate an LCoS self-calibration technique, from which we can perform a complete LCoS characterization. In particular, two important characteristics of LCoS displays are retrieved by using self-addressed digital holograms. On the one hand, we determine its phase-voltage curve by using the interference pattern generated by a digital two-sectorial split-lens configuration. On the other hand, the LCoS surface profile is also determined by using a self-addressed dynamic micro-lens array pattern. Second, the implementation of microparticle manipulation through optical traps created by an LCoS display is demonstrated. Finally, an LCoS display based inline (IL) holographic imaging system is described. By using the LCoS display to implement a double-sideband filter configuration, this inline architecture demonstrates the advantage of obtaining dynamic holographic imaging of microparticles independently of their spatial positions by avoiding the non-desired conjugate images.

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Section: Surface Profile Calibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microparticle Manipulation and Imaging through a Self-Calibrated Liquid Crystal on Silicon Display

et al. 2018

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“…However, if the input wavafront carries some aberrations, the light spots on the focal plane present certain offset displacements from their ideal spots. Thus, by measuring the displacements of each focal point from their ideal positions, the input wavefront can be retrieved by implementing proper numerical algorithms [37][38][39].…”

Section: Self-calibration Of the Lcos Screen Surface By Using A Micromentioning

confidence: 99%

Self-addressed diffractive lens schemes for the characterization of LCoS displays

Zhang

Lizana

Iemmi

et al. 2018

Emerging Liquid Crystal Technologies XIII

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We proposed a self-calibration method to calibrate both the phase-voltage look-up table and the screen phase distribution of Liquid Crystal on Silicon (LCoS) displays by implementing different lens configurations on the studied device within a same optical scheme. On the one hand, the phase-voltage relation is determined from interferometric measurements, which are obtained by addressing split-lens phase distributions on the LCoS display. On the other hand, the surface profile is retrieved by self-addressing a diffractive micro-lens array to the LCoS display, in a way that we configure a Shack-Hartmann wavefront sensor that self-determines the screen spatial variations. Moreover, both the phase-voltage response and the surface phase inhomogeneity of the LCoS are measured within the same experimental set-up, without the necessity of further adjustments. Experimental results prove the usefulness of the above-mentioned technique for LCoS displays characterization.

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“…Numbers of LCoS self-calibration methods, both optimize the phase-voltage relation and the surface phase inhomogeneity, are proposed in literatures [27,29]. Among them, interferometry [30,31] or diffraction [32,33] based methods are demonstrated suitable for the phase-voltage calibration, and the Shack-Hartmann pattern [34,35] meets the requirement to imply the surface inhomogeneity calibration.…”

Section: Introductionmentioning

confidence: 99%

Dynamic microparticle manipulation through light structures generated by a self-calibrated Liquid Crystal on Silicon display

Zhang

Lizana

Eeckhout

et al. 2018

Unconventional Optical Imaging

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This paper is devoted to investigate the application of different dynamic light structures generated by a self-calibrated Liquid Crystal on Silicon (LCoS) display for microparticle manipulation. Two major studies based on implementing different DOEs, to thoroughly characterize the LCoS display and to achieve optical-inspired particle manipulation, are proposed, respectively. On the one hand, we dynamically introduced the billet-lens configuration and the micro-lens array pattern on the LCoS display, from which the self-calibration of the studied device is implemented. In this case, both the phase-voltage relation and the surface profile were determined and optimized to the optimal performance for microparticle manipulation. On the other hand, we performed the optical manipulation of microparticles by addressing configurable three-dimensional light structures obtained from different phase driven split-lens configurations initiated by the same but optimized LCoS display. Experimental results demonstrated that, by addressing certain phase distributions on the LCoS display, the microparticle can be trapped in the light cones and manipulated by providing certain continuous split-lens configurations.

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Characterization of a parallel aligned liquid crystal on silicon and its application on a Shack-Hartmann sensor

Cited by 8 publications

References 11 publications

Microparticle Manipulation and Imaging through a Self-Calibrated Liquid Crystal on Silicon Display

Microparticle Manipulation and Imaging through a Self-Calibrated Liquid Crystal on Silicon Display

Self-addressed diffractive lens schemes for the characterization of LCoS displays

Dynamic microparticle manipulation through light structures generated by a self-calibrated Liquid Crystal on Silicon display

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