The Experts below are selected from a list of 4326 Experts worldwide ranked by ideXlab platform
Yuzuru Takashima - One of the best experts on this subject based on the ideXlab platform.
-
Review paper: imaging lidar by Digital Micromirror Device
Optical Review, 2020Co-Authors: Yuzuru Takashima, Brandon HellmanAbstract:Applications of Digital Micromirror Device for lidar are overviewed. A large Lagrange invariant value makes DMD as one of the attractive beam steering transmitter and receiver solutions for a time-of-flight lidar, especially with its an extended angular throw by synchronized pulsed laser illumination.
-
Angular and spatial light modulation by single Digital Micromirror Device for beam and pattern steering
Emerging Digital Micromirror Device Based Systems and Applications XII, 2020Co-Authors: Brandon Hellman, Joshua Rodriguez, Chuan Luo, Heejoo Choi, Yuzuru TakashimaAbstract:The “Angular Spatial Light Modulator” (ASLM) utilizes Digital Micromirror Device (DMD) as a binary patterned programmable blazed grating to increase number of output pixels of a DMD by merging geometric and diffractive optical capabilities of the DMD. We demonstrate series of capabilities of the ASLM for beam and pattern steering. In particular, a single-chip beam steering lidar, an extended FOV display, a light-field projector, and a multi-view display which can be implemented into AR/VR systems. We also present our metrology results of wavefront distortion of DMD while micro mirrors are transitioning over between on and off states.
-
Occlusion-capable optical-see-through near-eye display using single Digital Micromirror Device
Imaging and Applied Optics Congress, 2020Co-Authors: Myeong-ho Choi, Yuzuru Takashima, Brandon Hellman, Pengyu Liu, Ted L. Lee, Jaehyeung ParkAbstract:Occlusion of real scene by displayed virtual images is an important feature of augmented reality display Devices. We propose and demonstrate a novel occlusion scheme which uses a single Digital Micromirror Device for the real scene masking and virtual image display.
-
Multi-beam and single-chip LIDAR with discrete beam steering by Digital Micromirror Device
Physics and Simulation of Optoelectronic Devices XXVI, 2018Co-Authors: Joshua Rodriguez, Brandon Hellman, Braden Smith, Adley Gin, Alonzo Espinoza, Yuzuru TakashimaAbstract:A novel Digital Micromirror Device (DMD) based beam steering enables a single chip Light Detection and Ranging (LIDAR) system for discrete scanning points. We present increasing number of scanning point by using multiple laser diodes for Multi-beam and Single-chip DMD-based LIDAR.
-
single chip lidar with discrete beam steering by Digital Micromirror Device
Frontiers in Optics, 2017Co-Authors: Braden Smith, Brandon Hellman, Adley Gin, Alonzo Espinoza, Yuzuru TakashimaAbstract:MEMS-based beam steering by Digital Micromirror Device illuminated by pulsed laser enables single-chip LIDAR. We demonstrate 48° field of view, 3.4k points/sec scan rate, and <1cm accuracy for 1.2 m distance across five steering angles.
Dennis W Prather - One of the best experts on this subject based on the ideXlab platform.
-
Study of an NIR Digital Micromirror Device-based snapshot spectral imaging system
Emerging Digital Micromirror Device Based Systems and Applications IV, 2012Co-Authors: Iftekhar O Mirza, Gonzalo R Arce, Dennis W PratherAbstract:We discuss the design of a Digital Micromirror Device-based Snapshot Spectral Imaging (DMD-SSI) system for NIR wavelengths. A pair of low/high dispersion glasses was selected for building an NIR relay-lens and a double-Amici prism, which are needed for generating Compressive Sensing (CS) measurements in experimental settings. Aberrations of the system were simulated using the Zemax software, which were considered in a numerical model of the system. CS measurements were generated using this model accounting for those aberrations. We evaluated the quality of the spatial/spectral data-cubes reconstructed using those non-ideal CS measurements and discuss possible solutions of enhancing the reconstruction quality.
-
development of a Digital Micromirror Device based multishot snapshot spectral imaging system
Optics Letters, 2011Co-Authors: Iftekhar O Mirza, Gonzalo R Arce, Dennis W PratherAbstract:We report on the development of a Digital-Micromirror-Device (DMD)-based multishot snapshot spectral imaging (DMD-SSI) system as an alternative to current piezostage-based multishot coded aperture snapshot spectral imager (CASSI) systems. In this system, a DMD is used to implement compressive sensing (CS) measurement patterns for reconstructing the spatial/spectral information of an imaging scene. Based on the CS measurement results, we demonstrated the concurrent reconstruction of 24 spectral images. The DMD-SSI system is versatile in nature as it can be used to implement independent CS measurement patterns in addition to spatially shifted patterns that piezostage-based systems can offer.
Syed Azer Reza - One of the best experts on this subject based on the ideXlab platform.
-
broadband all Digital variable fiber optic attenuator using Digital Micromirror Device
IEEE Photonics Technology Letters, 2007Co-Authors: Nabeel A. Riza, Syed Azer RezaAbstract:To the best of our knowledge, we propose the first broadband variable fiber-optic attenuator (VFOA) using a Digital Micromirror Device (DMD). The VFOA design is based on a unique double reflection geometry structure that counters the strong spectral attenuation inherent when implementing single-mode-fiber light coupling via a pixelated blazed grating Device such as a DMD. The demonstrated VFOA features ~C-band 1530- to 1560-nm broadband attenuation operation with a plusmn0.17-dB in-band variation and a 25-dB attenuation dynamic range. This high repeatability all-Digital VFOA can be useful in broadband optical source controls, test instrumentation, telecommunications, signal processing, and sensor systems.
Brandon Hellman - One of the best experts on this subject based on the ideXlab platform.
-
Review paper: imaging lidar by Digital Micromirror Device
Optical Review, 2020Co-Authors: Yuzuru Takashima, Brandon HellmanAbstract:Applications of Digital Micromirror Device for lidar are overviewed. A large Lagrange invariant value makes DMD as one of the attractive beam steering transmitter and receiver solutions for a time-of-flight lidar, especially with its an extended angular throw by synchronized pulsed laser illumination.
-
Angular and spatial light modulation by single Digital Micromirror Device for beam and pattern steering
Emerging Digital Micromirror Device Based Systems and Applications XII, 2020Co-Authors: Brandon Hellman, Joshua Rodriguez, Chuan Luo, Heejoo Choi, Yuzuru TakashimaAbstract:The “Angular Spatial Light Modulator” (ASLM) utilizes Digital Micromirror Device (DMD) as a binary patterned programmable blazed grating to increase number of output pixels of a DMD by merging geometric and diffractive optical capabilities of the DMD. We demonstrate series of capabilities of the ASLM for beam and pattern steering. In particular, a single-chip beam steering lidar, an extended FOV display, a light-field projector, and a multi-view display which can be implemented into AR/VR systems. We also present our metrology results of wavefront distortion of DMD while micro mirrors are transitioning over between on and off states.
-
Occlusion-capable optical-see-through near-eye display using single Digital Micromirror Device
Imaging and Applied Optics Congress, 2020Co-Authors: Myeong-ho Choi, Yuzuru Takashima, Brandon Hellman, Pengyu Liu, Ted L. Lee, Jaehyeung ParkAbstract:Occlusion of real scene by displayed virtual images is an important feature of augmented reality display Devices. We propose and demonstrate a novel occlusion scheme which uses a single Digital Micromirror Device for the real scene masking and virtual image display.
-
Multi-beam and single-chip LIDAR with discrete beam steering by Digital Micromirror Device
Physics and Simulation of Optoelectronic Devices XXVI, 2018Co-Authors: Joshua Rodriguez, Brandon Hellman, Braden Smith, Adley Gin, Alonzo Espinoza, Yuzuru TakashimaAbstract:A novel Digital Micromirror Device (DMD) based beam steering enables a single chip Light Detection and Ranging (LIDAR) system for discrete scanning points. We present increasing number of scanning point by using multiple laser diodes for Multi-beam and Single-chip DMD-based LIDAR.
-
single chip lidar with discrete beam steering by Digital Micromirror Device
Frontiers in Optics, 2017Co-Authors: Braden Smith, Brandon Hellman, Adley Gin, Alonzo Espinoza, Yuzuru TakashimaAbstract:MEMS-based beam steering by Digital Micromirror Device illuminated by pulsed laser enables single-chip LIDAR. We demonstrate 48° field of view, 3.4k points/sec scan rate, and <1cm accuracy for 1.2 m distance across five steering angles.
Iftekhar O Mirza - One of the best experts on this subject based on the ideXlab platform.
-
Study of an NIR Digital Micromirror Device-based snapshot spectral imaging system
Emerging Digital Micromirror Device Based Systems and Applications IV, 2012Co-Authors: Iftekhar O Mirza, Gonzalo R Arce, Dennis W PratherAbstract:We discuss the design of a Digital Micromirror Device-based Snapshot Spectral Imaging (DMD-SSI) system for NIR wavelengths. A pair of low/high dispersion glasses was selected for building an NIR relay-lens and a double-Amici prism, which are needed for generating Compressive Sensing (CS) measurements in experimental settings. Aberrations of the system were simulated using the Zemax software, which were considered in a numerical model of the system. CS measurements were generated using this model accounting for those aberrations. We evaluated the quality of the spatial/spectral data-cubes reconstructed using those non-ideal CS measurements and discuss possible solutions of enhancing the reconstruction quality.
-
development of a Digital Micromirror Device based multishot snapshot spectral imaging system
Optics Letters, 2011Co-Authors: Iftekhar O Mirza, Gonzalo R Arce, Dennis W PratherAbstract:We report on the development of a Digital-Micromirror-Device (DMD)-based multishot snapshot spectral imaging (DMD-SSI) system as an alternative to current piezostage-based multishot coded aperture snapshot spectral imager (CASSI) systems. In this system, a DMD is used to implement compressive sensing (CS) measurement patterns for reconstructing the spatial/spectral information of an imaging scene. Based on the CS measurement results, we demonstrated the concurrent reconstruction of 24 spectral images. The DMD-SSI system is versatile in nature as it can be used to implement independent CS measurement patterns in addition to spatially shifted patterns that piezostage-based systems can offer.