Results 61 to 70 of about 96,711 (321)

Transmission wavefront shearing interferometry for photoelastic materials [PDF]

, 2009
A general analysis and experimental validation of transmission wavefront shearing interferometry for photoelastic materials are presented. These interferometers applied to optically isotropic materials produce a single interference pattern related to one
Bhattacharya, Kaushik, Kramer, Sharlotte L. B., Ravichandran, Guruswami   +2 more
core   +1 more source

Integrated Wavefront Sensing and Processing Method Utilizing Optical Neural Network

Photonics
Wavefront sensors and processors are vital components of adaptive optical (AO) systems, directly impacting the operating bandwidth. As application scenarios become increasingly complex, AO systems are confronted with more extreme atmospheric turbulence ...
Gang Luo, Yuanchao Geng, Deen Wang, Qiang Yuan, Dongxia Hu, Wanguo Zheng   +5 more
doaj   +1 more source

Multiple Spatial Frequencies Pyramid WaveFront Sensing [PDF]

, 2017
A modification of the pyramid wavefront sensor is described. In this conceptually new class of devices, the perturbations are split at the level of the focal plane depending upon their spatial frequencies, and then measured separately.
Bergomi, Maria, Biondi, Federico, Carolo, Elena, Chinellato, Simonetta, Dima, Marco, Farinato, Jacopo, Greggio, Davide, Gullieuszik, Marco, Magrin, Demetrio, Marafatto, Luca, Portaluri, Elisa, Ragazzoni, Roberto, Vassallo, Daniele, Viotto, Valentina   +13 more
core   +1 more source

Omnidirectional Transmissive Acoustic Metasurfaces Based on Goldberg Polyhedra

Advanced Functional Materials, EarlyView.
This study introduces omnidirectional acoustic metasurfaces capable of manipulating wavefronts in multiple arbitrary directions simultaneously. A full‐stack pipeline for design, optimization, and fabrication is presented to construct near‐spherical holograms based on Goldberg polyhedra.
Andrea Achilleos, James Hardwick, Ryuji Hirayama, Sriram Subramanian   +3 more
wiley   +1 more source

Training networks without wavefront label for pixel-based wavefront sensing

Frontiers in Physics
Traditional image-based wavefront sensing often faces challenges in efficiency and stagnation. Deep learning methods, when properly trained, offer superior robustness and performance.
Yuxuan Liu, Yuxuan Liu, Yuxuan Liu, Xiaoquan Bai, Xiaoquan Bai, Boqian Xu, Boqian Xu, Chunyue Zhang, Chunyue Zhang, Yan Gao, Yan Gao, Shuyan Xu, Shuyan Xu, Guohao Ju, Guohao Ju   +14 more
doaj   +1 more source

Wavefront sets and descent method for finite symplectic groups [PDF]

arXiv, 2022
In \cite{JZ1}, D. Jiang and L. Zhang proposed a conjecture which related the wavefront sets and the descent method in the local fields case. Recently, in \cite{JLZ}, they and D. Liu define the arithmetic wavefront set of certain irreducible admissible representation $\pi$ of a classical group $G(k)$ defined over local field $k$, which is a subset of $k$
arxiv  

Manipulating Ferroelectric Topological Polar Structures with Twisted Light

Advanced Materials, EarlyView.
We demonstrate dynamic control of ferroelectric order in quasi‐2D CsBiNb2O7 using twisted ultraviolet light carrying orbital angular momentum. Our approach harnesses non‐resonant multiphoton absorption and induced strain to modulate topological of ferroelectric polarization textures.
Nimish P. Nazirkar, Viet Tran, Pascal Bassène, Atoumane Ndiaye, Julie Barringer, Jie Jiang, Wonsuk Cha, Ross Harder, Jian Shi, Moussa N'Gom, Edwin Fohtung   +10 more
wiley   +1 more source

Binary Amplitude Reflection Gratings for X-ray Shearing and Hartmann Wavefront Sensors

Sensors, 2021
New, high-coherent-flux X-ray beamlines at synchrotron and free-electron laser light sources rely on wavefront sensors to achieve and maintain optimal alignment under dynamic operating conditions. This includes feedback to adaptive X-ray optics.
Kenneth A. Goldberg, Antoine Wojdyla, Diane Bryant   +2 more
doaj   +1 more source

Scalable Lithium Niobate Nanoimprinting for Nonlinear Metalenses

Advanced Materials, EarlyView.
A broadband polycrystalline lithium niobate platform is developed for highly versatile and scalable fabrication of nonlinear metasurfaces. This work demonstrates simultaneous second harmonic generation and wavefront‐shaping via a metalens on this platform.
Ülle‐Linda Talts, Helena Weigand, Irene Occhiodori, Rachel Grange   +3 more
wiley   +1 more source

Neuromorphic Light‐Responsive Organic Matter for in Materia Reservoir Computing

Advanced Materials, EarlyView.
In this work we show that light‐responsive adaptive organic matter can store and process information at the matter level, and emulate neuromorphic functionalities such as short term memory, long term memory and visual memory. Besides demonstrating that material dynamics can be exploited for spatio‐temporal event detection and motion perception, we show
Federico Ferrarese Lupi, Mateo Rosero‐Realpe, Antonio Ocarino, Francesca Frascella, Gianluca Milano, Angelo Angelini   +5 more
wiley   +1 more source