Abstract
In this paper, we demonstrate a dynamic holographic display in a quantum dot (ZnS/InP) doped liquid crystal device, where one of the interior cell surfaces is covered by a ZnSe layer. Such a hybrid device shows substantially improved photorefractive sensitivity of 2.2 cm3/J, which is almost 300 times larger than that in ZnS/InP doped liquid crystal device without the ZnSe layer. The holographic grating can form at intensities as low as ~0.8 mW/cm2, and exhibit a fast optical response of several to tens of milliseconds. Exploiting the superior performances of photosensitivity and fast response of this device, we obtain dynamic holographic videos of red, green, and blue colors, as well as a reconstructed image of high gray-scale fidelity.
Highlights
Holographic display is a true three-dimensional (3D) technique since it is capable of providing all the depth cues of an object or a scene, permits viewers to see the world in three dimensions with no fatigue [1, 2]
We proposed and demonstrated quantum dot (QD) doped liquid crystals (LCs) with a high diffraction efficiency and a fast response, using an applied electrical field of 1 V/μm [5]
A diffraction efficiency of ~12% and response time of ~6 ms are obtained at a recording intensity as low as ~0.8 mW/cm2, the nonlinear index coefficient n2 is as high as 2.1 cm2/W
Summary
Holographic display is a true three-dimensional (3D) technique since it is capable of providing all the depth cues of an object or a scene, permits viewers to see the world in three dimensions with no fatigue [1, 2]. We propose a hybrid LC cell that combines ZnS/InP doped LC with a ZnSe surface layer of the cell Due to this combination, a diffraction efficiency of ~12% and response time of ~6 ms are obtained at a recording intensity as low as ~0.8 mW/cm, the nonlinear index coefficient n2 is as high as 2.1 cm2/W. The cell is tilted at an angle of 45° with respect to the bisector of the two recording beams, the electrons and holes are separated and transported along the grating wave vector once a DC voltage is applied, resulting in a modulated photoconductivity and a non-uniform space charge field Esc. a spatially modulated reorientation of LCs and a periodic refractive index modulation are formed [20, 21]. The diffraction efficiency of the cell exhibits high sensitivity at laser powers of 0.2 μW to 15 μW, and at higher light intensities it keeps almost constant. The effects of both dielectric torque and elastic restore torque accelerate the decay process [25]
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