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Spatial light modulator

About: Spatial light modulator is a research topic. Over the lifetime, 9043 publications have been published within this topic receiving 130143 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, a programmable liquid crystal spatial light modulator enabling independent orbital angular momentum state control on multiple spectral channels is presented, using electrically controllable topological pixels that independently behave as geometric phase micro-optical elements.
Abstract: We report on a programmable liquid crystal spatial light modulator enabling independent orbital angular momentum state control on multiple spectral channels. This is done by using electrically controllable ``topological pixels" that independently behave as geometric phase micro-optical elements relying on self-engineered liquid crystal defects. These results open interesting opportunities in optical manipulation, sensing, imaging, and communications, as well as information processing. In particular, spectral vortex modulation allows considering singular spatiotemporal shaping of ultrashort pulses which may find applications in many areas such as material processing, spectroscopy, or elementary particles acceleration.

34 citations

Journal ArticleDOI
TL;DR: The near-field of the ring-slit aperture is investigated and it is shown that although the near- field possesses similar attributes to its Fourier transform, its intensity profile exhibits no rotation as it propagates.
Abstract: In this work we use a phase-only spatial light modulator (SLM) to mimic a ring-slit aperture, containing multiple azimuthally varying phases at different radial positions. The optical Fourier transform of such an aperture is currently known and its intensity profile has been shown to rotate along its propagation axis. Here we investigate the near-field of the ring-slit aperture and show, both experimentally and theoretically, that although the near-field possesses similar attributes to its Fourier transform, its intensity profile exhibits no rotation as it propagates.

34 citations

Patent
14 Jun 1990
TL;DR: In this article, the Fourier transform interference intensity is nonlinearly transformed to provide higher correlation peak intensity and a better defined correlation spot, and various types of autocorrelation signals can be produced simply by varying the severity of the nonlinearity and without the need to synthesize specific matched filters.
Abstract: In a nonlinear joint transform image correlator, the Fourier transform interference intensity is nonlinearly transformed to provide higher correlation peak intensity and a better defined correlation spot. The correlation signals are determined, for example, in terms of nonlinear characteristics of a spatial light modulator (SLM) at the Fourier plane. The correct phase information of the correlation signal is recovered from the first-order harmonic of the nonlinearly transformed interference intensity, and various types of autocorrelation signals can be produced simply by varying the severity of the nonlinearity and without the need to synthesize specific matched filters. For example, the autocorrelation signal produced by a phase-only matched filter can be obtained by selecting the appropriate nonlinearity.

34 citations

Journal ArticleDOI
TL;DR: By applying a fast computational algorithm for holograms, the system succeeded in aerially projecting 3D motion pictures of size ~2.5 mm3 by this system constructed by the modulator and mirrors and achieved hologram calculations at ~12 ms per hologram with 4 CPU cores.
Abstract: We demonstrate an aerial projection system for reconstructing 3D motion pictures based on holography. The system consists of an optical source, a spatial light modulator corresponding to a display and two parabolic mirrors. The spatial light modulator displays holograms calculated by computer and can reconstruct holographic motion pictures near the surface of the modulator. The two parabolic mirrors can project floating 3D images of the motion pictures formed by the spatial light modulator without mechanical scanning or rotating. In this demonstration, we used a phase-modulation-type spatial light modulator. The number of pixels and the pixel pitch of the modulator were 1,080 × 1,920 and 8.0 μm × 8.0 μm, respectively. The diameter, the height and the focal length of each parabolic mirror were 288 mm, 55 mm and 100 mm, respectively. We succeeded in aerially projecting 3D motion pictures of size ~2.5 mm3 by this system constructed by the modulator and mirrors. In addition, by applying a fast computational algorithm for holograms, we achieved hologram calculations at ~12 ms per hologram with 4 CPU cores.

34 citations

Proceedings ArticleDOI
25 Mar 2012
TL;DR: This work presents a framework for depth map acquisition using neither raster scanning by the illumination source nor an array of sensors, and uses a spatial light modulator (SLM) to spatially pattern a temporally-modulated light source.
Abstract: Light detection and ranging (LIDAR) systems use time of flight (TOF) in combination with raster scanning of the scene to form depth maps, and TOF cameras instead make TOF measurements in parallel by using an array of sensors. Here we present a framework for depth map acquisition using neither raster scanning by the illumination source nor an array of sensors. Our architecture uses a spatial light modulator (SLM) to spatially pattern a temporally-modulated light source. Then, measurements from a single omnidirectional sensor provide adequate information for depth map estimation at a resolution equal that of the SLM. Proof-of-concept experiments have verified the validity of our modeling and algorithms.

34 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023137
2022321
2021266
2020451
2019460
2018452