Results 61 to 70 of about 80,548 (342)
Adaptability analysis of travelling wavefront protection in LCC‐UHVDC transmission lines
IET Generation, Transmission & Distribution, 2023 The existing relay protections for line‐commutated converter (LCC)‐ultra high voltage DC (UHVDC) transmission lines are insufficient in protection sensitivity and operation speed. The travelling wavefront fault distance information can be used to improve
Zhongxue Chang +3 more
doaj +1 more source
Wavefront Aberration Sensor Based on a Multichannel Diffractive Optical Element
Italian National Conference on Sensors, 2020 We propose a new type of a wavefront aberration sensor, that is, a Zernike matched multichannel diffractive optical filter, which performs consistent filtering of phase distributions corresponding to Zernike polynomials. The sensitivity of the new sensor
S. Khonina, S. Karpeev, A. Porfirev
semanticscholar +1 more source
Advanced Optical Materials, EarlyView.Omni‐polarizers that pull all input polarization states to an elliptical or linear polarization can be made using highly resonant bi‐layer metasurfaces. The ellipticity of the selected polarization can be controlled by choosing the layer separation.
Ben Goldberg +2 more
wiley +1 more source
Nonreciprocal Wavefront Engineering with Time-Modulated Gradient Metasurfaces
Physical Review Applied, 2019 Author(s): Zang, JW; Correas-Serrano, D; Do, JTS; Liu, X; Alvarez-Melcon, A; Gomez-Diaz, JS | Abstract: © 2019 American Physical Society. We propose a paradigm to realize nonreciprocal wavefront engineering using time-modulated gradient metasurfaces. The
J. Zang +5 more
semanticscholar +1 more source
Topology Optimization Enables Freeform Matrix Fourier Optics
Advanced Optical Materials, EarlyView.A topology‐optimized freeform metasurface is designed and fabricated to realize matrix Fourier optics, enabling the diffraction of multiple polarization states into distinct far‐field orders. By combining forward design with gradient‐based inverse optimization, high polarization contrast of up to 98.7% is achieved.
Yu‐Tzu Liu +5 more
wiley +1 more source
MORPHOLOGICAL DESCRIPTIONS USING THREE-DIMENSIONAL WAVEFRONTS
Image Analysis and Stereology, 2011 The present study deals with the analysis of three-dimensional binary objects whose structure is not obvious nor generally clearly visible. Our approach is illustrated through three examples taken from biological microscopy.
Jean Serra
doaj +1 more source
Wavefront Reconstruction of Shack-Hartmann with Under-Sampling of Sub-Apertures
Photonics, 2023 Shack-Hartmann wavefront sensor plays a key role in adaptive optics (AO) systems, which detect the aberrant wavefront by an array of micro-lenslets across the aperture pupil.
Jian Huang +3 more
doaj +1 more source
WISH: wavefront imaging sensor with high resolution
Light: Science & Applications, 2019 Wavefront sensing is the simultaneous measurement of the amplitude and phase of an incoming optical field. Traditional wavefront sensors such as Shack-Hartmann wavefront sensor (SHWFS) suffer from a fundamental tradeoff between spatial resolution and ...
Yicheng Wu, M. Sharma, A. Veeraraghavan
semanticscholar +1 more source
High‐Isolation LCoS‐Based Optical Switch with Phase Hologram Parameter Optimization
Advanced Photonics Research, EarlyView.A 1 × 9 liquid crystal on silicon (LCoS)‐based optical switch is experimentally demonstrated, revealing that the worst‐case port isolation exceeds 37 dB within the wavelength range of 1460–1540 nm. This work offers an alternative route for the development of optical switches with a large number of ports and high isolation, applicable to large‐capacity ...
Linbojie Huang +8 more
wiley +1 more source
Achieving Directive Radiation and Broadband Microwave Absorption by an Anisotropic Metasurface
IEEE Access, 2019 Simultaneously integrating electromagnetic absorption and wavefront-shaping into a single metasurface with flat and low profile is crucial for many practical applications both in science and engineering community. Here, by introducing lossy components to
Jun Sun +6 more
doaj +1 more source