We examined the spatial resolution characteristics of surface-stabilized ferroelectric liquid crystals (SSFLCs) to produce an amplitude-type spatial light modulator with 1 μm pitch pixels for wide-field-of-view holographic displays. We compared the resolution of SSFLCs and parallel-aligned nematic liquid crystals (NLCs) using small-pitch stripe-shaped electrodes, and concluded that SSFLCs are superior. The enhanced resolution of SSFLCs is attributable to the symmetrical LC molecular alignment achieved by applying opposite-polarity direct-current voltages; NLCs are aligned using alternating-current voltages.

We have developed a magneto-optical spatial light modulator (MO-SLM) with a 10 k × 5 k pixel layout and with a pixel pitch horizontally of 1 µm and vertically of 4 µm. An MO-SLM device pixel has a magnetic nanowire made of Gd-Fe magneto-optical material whose magnetization was reversed by current-induced magnetic domain wall motion. We successfully demonstrated the reconstruction of holographic images, showing large viewing zone angles as wide as 30 degrees and visualizing different depths of the objects. These characteristics are unique to holographic images, providing physiological depth cues which may play a vital role in three-dimensional (3D) perception.

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