Abstract
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.
Highlights
The interest of using Liquid Crystal on Silicon (LCoS) displays to implement wavefront modulation has been widely discussed in literature [1,2,3,4]
The experimental implementation of the liquid crystal on silicon (LCoS) self-calibration is preliminarily presented using the split-lens configuration as well the micro-lens array scheme (Section 3.1)
We present the experiments to realize both the LCoS display phase-voltage and
Summary
The interest of using Liquid Crystal on Silicon (LCoS) displays to implement wavefront modulation has been widely discussed in literature [1,2,3,4]. Into the LCoS architecture, LC molecules are evenly distributed on a thin layer with a pixelated aluminum array connected beneath. Underneath the aluminum pixel array, an electronic circuity is integrated into the silicon chip, which allows controlling the voltages addressed to any pixel in the display [3]. When the system is optimized to work into the phase-only regime (by controlling the polarization of light illuminating the display [5]), the wavefront phase distribution can be spatially modified by addressing the proper voltage-inspired phase retardation distribution
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