摘要
An 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 mm down to 0.72 mm were demonstrated using a 405 nm wavelength write laser and a 635 nm wavelength read laser.
基金
The authors would like to thank EPSRC for financial support through the Platform Grant for LC Photonics(EP/F00897X/1)and JS Chen for calculating the holograms used in Figure 6
PKS thanks the Schiff Foundation for the financial support of a Schiff Studentship.
作者简介
Correspondence:Daping Chu,University of Cambridge,9 JJ Thomson Avenue,Cambridge CB30FA,UK,E-mail:dpc31@cam.ac.uk。
