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7,507 results on '"spatial light modulator"'

305. Study of Non-Periodic Pinhole Array Filter for Decreasing High-Order Noise for Compact Holographic Display

Author

Yoo Kwang Kim, Won Jong Ryu, and Jin Su Lee

Subjects
holography, 3D display, diffraction, Fourier optics, spatial light modulator, Technology, Engineering (General). Civil engineering (General), TA1-2040, Biology (General), QH301-705.5, Physics, QC1-999, Chemistry, QD1-999
Abstract

The non-periodic pinhole array filtering of a spatial light modulator (SLM) is proposed for filtering the high-order noise and DC noise of a holographic display. Conventionally, DC and high-order noise sources are filtered by a 4f filtering system. Because the 4f filtering system requires a long optical path length, noise filtering is a stumbling block when attempting to realize a compact holographic display. By contrast, the proposed method simply uses a thin filter fabricated by photolithography. In order to verify this concept, we confirmed the feasibility of the filter with a numerical simulation and with a custom-made non-periodic pinhole array filter used in a practical experiment. The proposed method was shown to have the potential to be used in applications ranging from compact wearable devices to table-top holographic displays.

Published
2020
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306. Lensless Scheme for Measuring Laser Aberrations Based on Computer-Generated Holograms

Author

George Krasin, Michael Kovalev, Nikita Stsepuro, Pavel Ruchka, and Sergey Odinokov

Subjects
phase aberrations, wavefront sensor, computer optics, computer-generated hologram, spatial light modulator, diffraction, Chemical technology, TP1-1185
Abstract

All of the existing holographic wavefront sensors are either bulky or have low accuracy of measuring wavefront aberrations. In this paper, we present an improvement of the holographic method of measuring wavefront aberrations using computer-generated Fourier holograms. The novelty of this work lies in the proposed approach to the synthesis of Fourier holograms, which are implemented using phase-only SLM. The main advantages of this method are the increased diffraction efficiency compared to the previously known methods, and the more compact implementation scheme due to the elimination of the conventional Fourier-lens. The efficiency of the proposed method was confirmed by numerical simulation and optical experiments.

Published
2020
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307. Fast-Response Liquid Crystal Phase Modulators with an Excellent Photostability

Author

Qian Yang, Junyu Zou, Yannanqi Li, and Shin-Tson Wu

Subjects
liquid crystals, spatial light modulator, liquid-crystal-on-silicon, photostability, Crystallography, QD901-999
Abstract

We report a new mixture, which is modified from Merck TL-216, for liquid-crystal-on-silicon spatial light modulators (SLMs). To achieve 2π phase change at λ = 633 nm with 5 V operation voltage, the measured response time is about 3 ms at 50 °C. Meanwhile, our mixture exhibits no sign of photodegradation and even the total dosage has exceeded 400 MJ/cm2 at a blue laser wavelength λ = 465 nm. In comparison, E7 died at about 30 MJ/cm2. Widespread applications of this material for high brightness SLMs, near-eye displays, and head-up displays are foreseeable.

Published
2020
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316. High-Precision Calibration of Phase-Only Spatial Light Modulators

Author

Yicheng Zhao, Zhi-Cheng Ren, Zheng Yuan, Jianping Ding, Wenxiang Yan, Hui-Tian Wang, Xi-Lin Wang, and Yuan Gao

Subjects
Wavefront, Physics, business.industry, Zernike polynomials, interferometer, Phase distortion, Phase (waves), Spatial light modulator, QC350-467, Optics. Light, calibration, Interference (wave propagation), Atomic and Molecular Physics, and Optics, TA1501-1820, symbols.namesake, Optics, Distortion, symbols, Light beam, Applied optics. Photonics, Electrical and Electronic Engineering, business, Phase modulation, phase modulation
Abstract

In the fields of optics and photonics, phase-only spatial light modulators (SLMs) play an increasingly important role in wave-front engineering. However, the SLMs are subject to wavefront distortion arising from the imperfection in the birefringence effect and physical structure of modulators. This paper presents a simple self-interference phase calibration method applicable to liquid-crystal SLM. We build a interferometric imaging system basing on the Pancharatnam-phase-shifting to measure the phase distribution of a light beam coming from SLMs. Two types of phase modulation errors of SLMs can be characterized in the measurement process: the erroneous gamma curve and shape aberration. The former belongs to dynamic phase distortion and is measured through a four-step Pancharatnam phase shifting interference, which allows a one-shot recording of interference pattern via a polarization camera; the latter represents static phase distortion and is extracted from the interference between light waves coming from different regions of the SLM panel by using Zernike polynomial fitting. Our method has the advantages of high-precision pixel-wise phase correction and robustness against environmental disturbance, and thus can facilitate the applications of SLM in the optical field manipulation.

Published
2022
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317. Trapping and Sorting Micro-Nano Particles in a Dynamic Optical Sieve

Author

Jian Chen, Dongmei Liu, Jian Qiu, Li Peng, Kaiqing Luo, and Peng Han

Subjects
fringe-like optical field, optical micromanipula- tion, Applied optics. Photonics, QC350-467, Electrical and Electronic Engineering, Optics. Light, Dynamic optical sieve, spatial light modulator, Atomic and Molecular Physics, and Optics, TA1501-1820
Abstract

We propose a novel strategy for optical trapping and sorting of micro-nano particles that does not involve the flow of the immersion medium. The method employs the size- and velocity-dependent response of suspended polystyrene particles to the optical sieve of a dynamic fringelike pattern generated by a spatial light modulator. We not only experimentally demonstrate the trapping and transport of polystyrene particles with 2 μm diameter, but also study the sorting of a polydisperse suspension of polystyrene beads with diameters of 0.8 and 2 μm. The results provide new insights into particle manipulation and separation, and reveal that there is still scope for sorting smaller particles based on dynamic optical sieve.

Published
2022

330. Mode Multiplexing and High Efficient Switching in Few-Mode Fiber Based on Modeled Blazed Grating

Author

Yuan-Hua Feng, Jiawei Luo, Yuru Li, Jianping Li, and Zhaohui Li

Subjects
optical communication, spatial light modulator, blazed grating, data switching, Applied optics. Photonics, TA1501-1820, Optics. Light, QC350-467
Abstract

We propose a novel approach based on modeled blazed grating (MBG) to realize the mode conversion, multiplexing, demultiplexing, and switching in few-mode transmission fibers. The proposed grating can distribute different modes to different diffraction orders. We demonstrate the generation, multiplexing, demultiplexing, and high efficient conversion and switching of independent coaxial modes in a few-mode transmission fiber using MBG experimentally.

Published
2016
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331. Computer-Generated Holography Methods for Data Page Reconstruction Using Phase-Only Medium

Author

Timur Z. Minikhanov, Evgenii Y. Zlokazov, Pavel A. Cheremkhin, Rostislav S. Starikov, and Nikolay N. Evtikhiev

Subjects
Fluid Flow and Transfer Processes, Process Chemistry and Technology, General Engineering, General Materials Science, computer-generated holography, holographic data storage, data page, amplitude modulation, phase modulation, spatial light modulator, Fourier hologram, bipolar intensity, double-phase coding, quadrature amplitude modulation, Instrumentation, Computer Science Applications
Abstract

Achievements in the field of high-speed spatial modulation electrooptic components provide the possibility to create perspective optical-digital diffractive systems for information storage and processing that outperform modern electronic counterparts by utilizing throughput, energy efficiency, and reliability. This work presents a study of computer-generated holography methods that allow the formation of spatially-modulated information signals (data pages) with high accuracy using phase-only spatial light modulators. Computer-generated Fourier hologram fringe patterns were formed using bipolar intensity and double-phase coding. Numerical and experimental results of both methods’ implementation are compared. It was determined that bipolar intensity holograms provide higher data density on the data page if complex digital modulation methods such as multilevel amplitude and phase or quadrature modulation are used to represent data points. Double-phase coding can offer perspective for multilevel amplitude or multilevel intensity modulated data page reconstruction; however, exact control of phase modulation characteristics is required to obtain high reconstruction quality.

Published
2023
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332. High Resolution Multiview Holographic Display Based on the Holographic Optical Element

Author

Xiujuan Qin, Xinzhu Sang, Hui Li, Rui Xiao, Chongli Zhong, Binbin Yan, Zhi Sun, and Yu Dong

Subjects
Control and Systems Engineering, Mechanical Engineering, Electrical and Electronic Engineering, holographic display, spatial light modulator, holographic optical element
Abstract

Limited by the low space-bandwidth product of the spatial light modulator (SLM), it is difficult to realize multiview holographic three-dimensional (3D) display. To conquer the problem, a method based on the holographic optical element (HOE), which is regarded as a controlled light element, is proposed in the study. The SLM is employed to upload the synthetic phase-only hologram generated by the angular spectrum diffraction theory. Digital grating is introduced in the generation process of the hologram to achieve the splicing of the reconstructions and adjust the position of the reconstructions. The HOE fabricated by the computer-generated hologram printing can redirect the reconstructed images of multiview into multiple viewing zones. Thus, the modulation function of the HOE should be well-designed to avoid crosstalk between perspectives. The experimental results show that the proposed system can achieve multiview holographic augmented reality (AR) 3D display without crosstalk. The resolution of each perspective is 4K, which is higher than that of the existing multiview 3D display system.

Published
2023
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333. Spatial light modulator-based maskless laser lithography using Fourier filtering and focal shift

Author

Ulm, Andreas, Ahmed, Mirza Tareq, Schmitt, Robert H., and Publica

Subjects
Mikrostrukturierung, Lithography, Acoustics and Ultrasonics, ddc:530, Spatial light modulator, Condensed Matter Physics, Lithographie, Nanostrukturierung, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials
Abstract

Journal of physics / D 56(3), 035102 (2022). doi:10.1088/1361-6463/aca2b8, Published by IOP Publ., Bristol

Published
2023
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334. Multifocal laser direct writing through spatial light modulation guided by scalable vector graphics

Author

Linhan Duan, Yueqiang Zhu, Haoxin Bai, Chen Zhang, Kaige Wang, Jintao Bai, and Wei Zhao

Subjects
Physics - Instrumentation and Detectors, Control and Systems Engineering, Mechanical Engineering, two-photon lithography, scalable vector graphics, spatial light modulator, multi-focus parallel processing, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Electrical and Electronic Engineering
Abstract

Multi-focal laser direct writing (LDW) based on phase-only spatial light modulation (SLM) can realize flexible and parallel nanofabrication with high-throughput potential. In this investigation, a novel approach of combining two-photon absorption, SLM, and vector path-guided by scalable vector graphics (SVGs), termed SVG-guided SLM LDW, was developed and preliminarily tested for fast, flexible, and parallel nanofabrication. Three laser focuses were independently controlled with different paths, which were optimized according to the SVG to improve fabrication and promote time efficiency. The minimum structure width could be as low as 81 nm. Accompanied by a translation stage, a carp structure of 18.10 μm × 24.56 μm was fabricated. This method shows the possibility of developing LDW techniques toward fully electrical systems, and provides a potential way to efficiently engrave complex structures on nanoscales.

Published
2023
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335. Holographic Optogenetic Activation of Neurons Eliciting Locomotion in Head-Embedded Larval Zebrafish.

Author

Jia X and Wyart C

Subjects
Animals, Locomotion, Neurons, Animals, Genetically Modified, Larva, Optogenetics, Zebrafish genetics
Abstract

Understanding how motor circuits are organized and recruited in order to perform complex behavior is an essential question of neuroscience. Here we present an optogenetic protocol on larval zebrafish that allows spatial selective control of neuronal activity within a genetically defined population. We combine holographic illumination with the use of effective opsin transgenic lines, alongside high-speed behavioral monitoring to dissect the motor circuits of the larval zebrafish., (© 2024. The Author(s), under exclusive license to Springer Science+Business Media, LLC, part of Springer Nature.)

Published
2024
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340. Adaptive Coded Aperture Photography

Author

Bimber, Oliver, Qureshi, Haroon, Grundhöfer, Anselm, Grosse, Max, Danch, Daniel, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Bebis, George, editor, Boyle, Richard, editor, Parvin, Bahram, editor, Koracin, Darko, editor, Wang, Song, editor, Kyungnam, Kim, editor, Benes, Bedrich, editor, Moreland, Kenneth, editor, Borst, Christoph, editor, DiVerdi, Stephen, editor, Yi-Jen, Chiang, editor, and Ming, Jiang, editor

Published
2011
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341. MEMS Interleaving Read Operation of a Holographic Memory for Optically Reconfigurable Gate Arrays

Author

Morita, Hironobu, Watanabe, Minoru, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Koch, Andreas, editor, Krishnamurthy, Ram, editor, McAllister, John, editor, Woods, Roger, editor, and El-Ghazawi, Tarek, editor

Published
2011
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342. Reversible Transition of Photonic DNA Automaton Using Hairpin-DNA Responding to a Single Kind of Photonic Signal

Author

Sakai, Hiroto, Ogura, Yusuke, Tanida, Jun, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Sakakibara, Yasubumi, editor, and Mi, Yongli, editor

Published
2011
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349. Optical Cell Manipulation

Author

Stüber, Carsten, Kießling, Tobias, Fritsch, Anatol, Wetzel, Franziska, Schulze, Christian, Strehle, Dan, Käs, Josef, and Bhushan, Bharat, editor

Published
2010
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