Abstract
AbstractAn optically addressed spatial light modulator (OASLM) can modulate the wavefront of a read light by displaying a phase pattern or a hologram configured by the intensity distribution of a write light. Using ZnO nanoparticles (NPs) as a novel photoconductor, a high-resolution OASLM was fabricated. A ZnO NP suspension was spin-coated on an indium tin oxide (ITO)-coated glass substrate and annealed to form a photosensitive layer. The device was characterized electrically and optically. The device was operated at low driving voltages in the transmission mode. Updatable recording of a diffraction grating up to 825 lp mm−1 with a diffraction efficiency (DE) of 0.05% and binary holograms with pixel sizes from 2 µm down to 0.72 µm were demonstrated using a 405 nm wavelength write laser and a 635 nm wavelength read laser.
Highlights
A hologram as a recorded interference pattern consists of both amplitude and phase information of the light diffracted from the target object
A ZnO NP suspension in ethanol (Sigma Aldrich Co., Gillingham, Dorset, UK) was spin-coated on top of indium tin oxide (ITO)-coated glass followed by annealing at 180 6C for 10 min
Our preliminary experiment shows that at 473 nm, a powerful 5 mW laser is needed as a write light
Summary
A hologram as a recorded interference pattern consists of both amplitude and phase information of the light diffracted from the target object. To provide a wide viewing angle, the pixel pitch of the recording media needs to be comparable to or smaller than the wavelength of light. This is difficult to achieve using the current electrically addressable spatial light modulators (EASLMs), such as phase-only liquid crystal on silicon devices or digital mirror devices. The structure of an optically addressed spatial light modulator (OASLM) enables very high resolution without the need for complicated fabrication processes. The absence of inter-pixel gaps and ease of fabrication and operation together with the extremely high resolution achievable for written phase patterns make the OASLM a favorable choice for holographic displays
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