Emerging digital micromirror device (DMD) applications

Dudley, Dana; Duncan, W. M.; Slaughter, John W

doi:10.1117/12.480761

Cited by 419 publications

(232 citation statements)

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“…5 Stressed liquid crystals can provide a sub-millisecond control with continuous phase modulation; 6 however, their mass production is not feasible due to the requirement of delicate mechanical shearing process. Microelectro-mechanical systems (MEMS) based movable micro-mirrors, known as digital micro-mirror device (DMD) technology, 7 offer faster spatial light modulation typically at 10 kHz. 8 However, they only operate in a binary amplitude mode resulting from sophisticated device structures, and complex fabrication processes make them less attractive for mass-production.…”

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confidence: 99%

High-Speed, Phase-Dominant Spatial Light Modulation with Silicon-Based Active Resonant Antennas

Horie

Arbabi

et al. 2017

ACS Photonics

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Spatiotemporal control of optical wavefronts is of great importance in numerous free-space optical applications including imaging in 3D and through scattering media, remote sensing, and generation of various beam profiles for microscopy. Progress in these applications is currently limited due to lack of compact and high-speed spatial light modulators. Here we report an active antenna comprising a free-space coupled asymmetric Fabry–Perot resonator that produces a phase-dominant thermo-optic modulation of reflected light at frequencies approaching tens of kilohertz. As a proof of concept for spatial light modulation, we demonstrate a 6 × 6 array of such active antennas with beam deflection capability. The robust design of our silicon-based active antenna will enable large-scale integration of high-speed, phase-dominant spatial light modulators.

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confidence: 99%

High-Speed, Phase-Dominant Spatial Light Modulation with Silicon-Based Active Resonant Antennas

Horie

Arbabi

et al. 2017

ACS Photonics

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“…La primera consiste en un sistema micro-mecánico de micro-espejos movibles [7] y la segunda es usando un material electro-óptico como los cristales líquidos sobre silicio LCoS (del inglés LiquidCrystalonSilicon).Los SLM -LCoS funcionan como un retardador de la fase de la luz, ya que las moléculas alargadas del cristal líquidotienen una anisotropía óptica, lo que hace que sean birrefringentes,es decir,tienen 2 índices de refracción (ordinario y extraordinario), de modo que se produce un retardo entre las componentes de la luz [8].…”

Section: Introductionunclassified

Desarrollo de un sistema basado en un LCOS-SLM para la generación de espectros sintonizables

Henríquez¹

2017

DOCTUMH

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Cómo citar este trabajo How to cite this paperA. Cofré Hernríqez, "Desarrollo de un sistema basado en un LCOS-SLM para la generación de espectros sintonizables" Revista Doctorado UMH, vol. 2, no 2, p.2, 2016. [Online].Desarrollo de un sistema basado en un LCOS-SLM para la generación de espectros sintonizablesDevelopment based on a LCoS-SLM for generatingtunable spectra system RESUMENEmpleando un modulador espacial de luz de cristal líquido sobre silicio (LCoS-SLM) como un retardador pixelado programable, se ha logrado desarrollar un sistema óptico que permite controlar el espectro de una fuente de luz láser de supercontínuo. El haz polarizado pasa por una red de difracción que descompone sus componentes espectrales, que se proyectansobre el LCoS-SLM, al cual aplicamos desde un ordenador diferentes máscaras de nivel de gris, logrando modificar la fase de cada longitud de onda. Al recombinarse el haz completo y atravesar por un analizador permite el paso de la intensidad de la luz de cada longitud de onda de acuerdo a la nueva fase que ésta adquirió en el modulador. Para la creación de las máscaras se analizaron tres métodos, el primero basado en un ajuste de Cauchy, el segundo en una interpolación de los valores obtenidos por un muestreo rápido y la última propuesta en la creación de una tabla con todos los valores.Finalmente presentamos los diferentes resultados que se obtuvieron como la elección de ciertas longitudes de onda y la creación de un filtro paso banda variable.Palabras clave: Dispositivo cristal líquido, modulador, espectro, polarización. ABSTRACTWe used a liquid crystal on silicon spatial light modulator (LCoS-SLM) as a programmable pixelated retarder. We have developed an optical system that allows to control the spectrum of a supercontinuum laser light source. The polarized beam passes through a diffraction grating which splits the spectral components. Then is projected onto the LCoS-SLM where we apply from a computer different masks gray level, in order to modify the phase of each wavelength.After recombination and passage through an analyzer,the different wavelengths pass or not according to the new phase acquired in the modulator. Three methods were analyzed for creating masks, the first based on aCauchy relation fit, the second in an interpolation of the values obtained by rapid sampling and the latest proposal on creating a table with all values. Finally, we present the different results obtained as the choice of certain wavelengths and creating a variable pass band filter.

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“…In order to project a desired intensity value, the DLP projector emits a series of light pulses of different time intervals [13]. A sensor aggregates the pulses of light over the duration of its integration time (say, 1/30s in a video camera) to capture the final gray-valued brightness.…”

Section: Temporal Dithering In a Dlp Projectormentioning

confidence: 99%

“…The key component of a DLP projector is the Digital Micromirror Device (DMD). Each mirror in the DMD is 14 × 14 microns and can switch between two orientations, +12 o and −12 o [13]. In one orientation, incident light is reflected by the mirror toward the outside scene and in the other, light is reflected onto a black surface within the projector.…”

Section: Introductionmentioning

confidence: 99%

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Temporal Dithering of Illumination for Fast Active Vision

Narasimhan

Koppal

Yamazaki

2008

Lecture Notes in Computer Science

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Abstract. Active vision techniques use programmable light sources, such as projectors, whose intensities can be controlled over space and time. We present a broad framework for fast active vision using Digital Light Processing (DLP) projectors. The digital micromirror array (DMD) in a DLP projector is capable of switching mirrors "on" and "off" at high speeds (10 6 /s). An off-the-shelf DLP projector, however, effectively operates at much lower rates (30-60Hz) by emitting smaller intensities that are integrated over time by a sensor (eye or camera) to produce the desired brightness value. Our key idea is to exploit this "temporal dithering" of illumination, as observed by a high-speed camera. The dithering encodes each brightness value uniquely and may be used in conjunction with virtually any active vision technique. We apply our approach to five well-known problems: (a) structured light-based range finding, (b) photometric stereo, (c) illumination de-multiplexing, (d) high frequency preserving motion-blur and (e) separation of direct and global scene components, achieving significant speedups in performance. In all our methods, the projector receives a single image as input whereas the camera acquires a sequence of frames.

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Emerging digital micromirror device (DMD) applications

Cited by 419 publications

References 10 publications

High-Speed, Phase-Dominant Spatial Light Modulation with Silicon-Based Active Resonant Antennas

High-Speed, Phase-Dominant Spatial Light Modulation with Silicon-Based Active Resonant Antennas

Desarrollo de un sistema basado en un LCOS-SLM para la generación de espectros sintonizables

Temporal Dithering of Illumination for Fast Active Vision

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