<title>Optically addressed spatial light modulators for replaying computer-generated holograms</title>

Abstract

Holographic techniques offer a route to the generation of 3-D images having all the depth cues used by the human vision system. A new electro-optic modulator system has been developed by the authors to replay dynamic holographic images. This Active Tiling (AT) system offers a route to replay giga-pixel computer generated holographic (CGH) images with video refresh rates. A key component of the AT system is an Optically Addressed Spatial Light Modulator (OASLM), onto which segments of the large pixel count CGH are loaded or written sequentially before the whole CGH frame is read out simultaneously. The OASLM device structure used consists of an amorphous silicon photosensor layer combined with surface stabilised ferroelectric liquid crystal (SSFLC) light modulation layer. A number of experiments have been conducted to determine the performance and suitability of this device for replaying a CGH. These experiments include electro-optic switching to determine the operating window and diffraction efficiency (DE) measurements to determine spatial resolution performance. A detailed description of the experimental apparatus and method used for measuring DE is presented and results show the OASLM to be capable of diffracting light from fringe patterns with spatial periods as low as 3 µm (333 lp/mm). Examples of CGH replay of 3D images from the OASLM when operating within the AT system are also presented.

Coding metamaterials, digital metamaterials and programmable metamaterials

“…41,42 For example, for a phase shift of p, the etching depth has to be approximately equal to the wavelength of light, 41 which is electrically large for microwaves. The related area also includes spatial light modulators, 43 which impose certain forms of spatially varying modulations on the light beams. By combining with metamaterial particles, metamaterial absorber spatial light modulators were realized in the terahertz frequencies.…”

Characterization of optically addressed light valve and its application in radially polarized light generation

“…One of the most common applications is liquid crystal displays (LCDs) due to its small size, lightweight, low voltage driven and low power consumption compared to cathode ray tube (CRT). Besides the display technology, it has been proposed to use as switchable polarization converter [1,2], and spatial light modulators (SLMs) [3][4][5][6][7][8][9]. It can be one-or two-dimensional spatially amplitude and/or phase modulated.…”

“…They are dynamically reconfigurable via proper addressing from a computer. SLMs are widely used in many applications, such as laser pulse shaping [3,4], optical tweezers [5,6], computer generated hologram [7,8] and wave front correction [9].…”

A high-resolution optically addressed spatial light modulator based on ZnO nanoparticles

“…This DE is termed the cell DE in the literature. 30,31 The light intensity is measured at the end of a positive driving pulse using a power meter. All measurements are carried out in a dark room, and the background noise is subtracted from the recorded reading.…”