Results 21 to 30 of about 1,618 (216)
Photonic terahertz phased array via selective excitation of nonlinear Pancharatnam-Berry elements [PDF]
Nature CommunicationsPhased arrays are crucial in various technologies, such as radar and wireless communications, due to their ability to precisely control and steer electromagnetic waves.
Li Niu +13 more
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Hybrid imaging system with wavefront coding
, 2011 De nouveaux concepts d’imagerie permettent aux systèmes optiques d’être plus compacts et plus performants. Parmi ces nouvelles techniques, les systèmes d’imagerie hybrides par codage de pupille allient un système optique comprenant un masque de phase et ...
Diaz, Frédéric
core +2 more sources
Spectrally exclusive phase masks for wavefront coding [PDF]
Optics Letters, 2021 The use of phase masks is necessary for wavefront coding, and these are often based on optical path differences. However, the optical dispersion constrains the resulting device to operate within a restricted spectral bandwidth. Here we propose to remove this constraint due to sub-wavelength structuration of the surface.
Micke Boher +4 more
openaire +2 more sources
Applied Sciences, 2023 Phase mask optimization is one of the critical steps in designing a wavefront coding system to extend the depth of field (DoF). As a classical phase mask, a cubic phase mask was taken as an example. An improved particle swarm optimization (PSO) algorithm
Zeyu Huang +4 more
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Dynamic macroblock wavefront parallelism for parallel video coding
Journal of Visual Communication and Image Representation, 2015 Wavefront parallelism is effective for parallel video encoding thanks to its merits of low latency, no quality loss and high degree of parallelism. In traditional video encoders, macroblock row wavefront (MRW) parallelism was widely adopted.
Wang, Ronggang +4 more
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Acoustic wavefront manipulation via transmission-type labyrinth structure
Frontiers in Physics, 2022 In this work, a transmission-type labyrinth structure (LS) is proposed to construct subwavelength acoustic functional metasurfaces, through which various desirable acoustic wavefront manipulation can be achieved in a broadband from 2,700 Hz to 3,900 Hz ...
Rui Wang, Fengbao Yang
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Wavefront coding for laser protection of electro-optical imaging systems: a long-distance experimental study [PDF]
Frontiers of OptoelectronicsWavefront coding technology employs a phase mask to modulate the phase of incident light, thereby dispersing the laser spot on the detector and achieving laser protection for optical systems.
Ye Liu +7 more
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Investigation of extended depth-of-field f/8 camera with optimized cubic phase mask and digital restoration [PDF]
EPJ Web of Conferences, 2020 An investigation of extended depth-of-field camera with optimized phase mask and digital restoration is presented. The goal of this paper is to implement the wavefront coding technique without affecting much of the original design, and the design has ...
Chiu Po-Sheng +3 more
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Nuclear Engineering and Technology, 2021 The laser transport system of the high power laser facility is mainly composed of large-aperture laser transport mirrors (TMs). Obtaining the high-resolution online damage images during the operation, which is of great significance for operating safely ...
Wang Fang +4 more
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Curvature Sensing-Based Pupil Alignment Method for Large-Aperture Telescopes
IEEE Photonics Journal, 2023 In optical systems, pupil alignment is an important component of wavefront sensing, closed-loop feedback, and imaging vignetting control because it directly affects the detection limit of the system and thus the realization of scientific goals.
Qichang An +5 more
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