Results 101 to 110 of about 2,024,523 (345)

Shack-Hartmann wavefront sensing using spatial-temporal data from an event-based image sensor.

Optics Express, 2020
An event-based image sensor works dramatically differently from the conventional frame-based image sensors in a way that it only responds to local brightness changes whereas its counterparts' output is a linear representation of the illumination over a ...
Fanpeng Kong, A. Lambert, Damien Joubert, Gregory Cohen   +3 more
semanticscholar   +1 more source

Terahertz Chiral Recognition Based on Metasurfaces

Advanced Photonics Research, EarlyView.
A novel terahertz chiral sensing method based on a multilayer metallic metasurface is proposed. The left‐handed circularly polarized and right‐handed circularly polarized components in the linearly polarized illuminating light into two focal points and convert them back into linear polarization for convenient measurement.
Xuyang Ji, Yufei Liu, Shuang Sun, Zehao He, Yuyao Yang, Yan Zhang   +5 more
wiley   +1 more source

Anisotropic Second‐ and Third‐Harmonic Hermite–Gaussian Beam Generation with NbOI2 Holograms

Advanced Photonics Research, EarlyView.
Anisotropic second‐ and third‐harmonic Hermite–Gaussian (HG) beam generation is demonstrated with ultrathin NbOI2 grating holograms to produce the nonlinear HG01 and HG10 modes with high anisotropy ratios. The relative magnitudes of the second‐ and third‐order nonlinear susceptibility tensor elements of NbOI2 crystal are extracted. These demonstrations
Jayanta Deka, Jie Gao, Xiaodong Yang
wiley   +1 more source

TacScope: A Miniaturized Vision‐Based Tactile Sensor for Surgical Applications

Advanced Robotics Research, EarlyView.
TacScope is a compact, vision‐based tactile sensor designed for robot‐assisted surgery. By leveraging a curved elastomer surface with pressure‐sensitive particle redistribution, it captures high‐resolution 3D tactile feedback. TacScope enables accurate tumor detection and shape classification beneath soft tissue phantoms, offering a scalable, low‐cost ...
Md Rakibul Islam Prince, Sheeraz Athar, Pokuang Zhou, Yu She   +3 more
wiley   +1 more source

Centroid computation for Shack-Hartmann wavefront sensor in extreme situations based on artificial neural networks.

Optics Express, 2018
This paper proposes a method used to calculate centroid for Shack-Hartmann wavefront sensor (SHWFS) in adaptive optics (AO) systems that suffer from strong environmental light and noise pollutions.
Ziqiang Li, Xinyang Li
semanticscholar   +1 more source

Exploring Phonon Interference: Insights From a Nano‐Scale Silicon Double Slit Atomistic Simulation

Advanced Theory and Simulations, EarlyView.
Classical Waves at the Atomic Scale: Molecular Dynamics Reveal Phonon Interference in Silicon Nanostructures. Abstract In this study, the classic double‐slit experiment, originally developed for light waves is successfully adapted, to investigate the behavior of phonons in crystalline silicon.
Efstratios Nikidis, Paul Desmarchelier, Yoshiaki Nakamura, Anne Tanguy, Konstantinos Termentzidis, Joseph Kioseoglou   +5 more
wiley   +1 more source

Adaptive optics with an infrared pyramid wavefront sensor

Astronomical Telescopes + Instrumentation, 2018
Wavefront sensing in the infrared is highly desirable for the study of M-type stars and cool red objects, as they are sufficiently bright in the infrared to be used as the adaptive optics guide star.
C. Bond, P. Wizinowich, M. Chun, D. Mawet, S. Lilley, S. Cetre, N. Jovanovic, J. Delorme, E. Wetherell, S. Jacobson, C. Lockhart, Eric A. Warmbier, J. Wallace, D. Hall, S. Goebel, O. Guyon, C. Plantet, G. Agapito, C. Giordano, S. Esposito, Bruno Femenía-Castellá   +20 more
semanticscholar   +1 more source

Generalised optical differentiation wavefront sensor: a sensitive high dynamic range wavefront sensor

Optics Express, 2016
Current wavefront sensors for high resolution imaging have either a large dynamic range or a high sensitivity. A new kind of wavefront sensor is developed which can have both: the Generalised Optical Differentiation wavefront sensor. This new wavefront sensor is based on the principles of optical differentiation by amplitude filters.
openaire   +4 more sources

Plenoptic wavefront sensor with scattering pupil

Optics Express, 2014
We consider a wavefront sensor combining scattering pupil with a plenoptic imager. Such a sensor utilizes the same reconstruction principle as the Hartmann-Shack sensor, however it is free from the ambiguity of the spot location caused by the periodic structure of the sensor matrix, and allows for wider range of measured aberrations.
Gleb Vdovin, Mikhail Loktev, Oleg Soloviev   +2 more
openaire   +3 more sources

Enhanced Spectral Tunability by Sub‐10 nm Nanogaps in Graphene‐Metal Hybrid Metasurfaces

Advanced Science, EarlyView.
A tunable mid‐infrared metasurface integrating graphene and metal antenna arrays with sub‐10 nm nanogaps is presented, overcoming the ≈20 nm limit of conventional fabrication. The enhanced spectral tuning range and modulation depth are enabled by combining electron‐beam lithography, thin metal deposition, and directional ion milling to precisely define
Fei Han, Zaoyang Lin, Kacper Pilarczyk, Hongwei Tang, Guy A. E. Vandenbosch, Joris Van de Vondel, Xuezhi Zheng, Niels Verellen, Ewald Janssens   +8 more
wiley   +1 more source