Results 111 to 120 of about 2,844,522 (254)

Photonic integrated circuits for astronomy: A formal description of an integrated photonics-based wavefront sensor (IP-WFS)

Astronomy & Astrophysics
Context. Solar wavefront sensing has been a challenge for astrophysical instrumentalists, due to the low contrast between the Sun and the sky background compared to night-time observations, which limits the performance of adaptive optics systems.
Portero-Rodríguez D., García-Vázquez H., Díaz García J. J., Rodríguez Ramos L. F., Gracia Témich F., Aguerri J. Alfonso L.   +5 more
doaj   +1 more source

Kaleidoscopic Electromagnetic Wave Manipulation via a Universal Reconfigurable Metasurface Platform

Electron, EarlyView.
A multidimensional reconfigurable metasurface enables independent control of the amplitude, phase, polarization, and spectral responses of reflected electromagnetic (EM) waves. Integrating spatial, polarization, and spectral manipulation within a single platform, it provides a versatile solution for intelligent EM systems, next‐generation wireless ...
Wanting Tong, Yi Wu, Ye Deng, Cheng Zhang, Chaoyun Song, Yizhou Shen, Junming Zhao, Tian Jiang, Ke Chen, Yijun Feng   +9 more
wiley   +1 more source

Controlling the wavefront aberration of a large-aperture and high-precision holographic diffraction grating

Light: Science & Applications
The scanning interference field exposure technique is an effective method to fabricate holographic diffraction grating with meter-level size and nano-level precision.
Wenhao Li, Xinyu Wang, Bayanheshig, Zhaowu Liu, Wei Wang, Shan Jiang, Yubo Li, Shuo Li, Wei Zhang, Yanxiu Jiang, Zheng Wu, Wenyuan Zhou   +11 more
doaj   +1 more source

Deep learning enabled robust wavefront sensing for active beam smoothing with a continuous phase modulator

High Power Laser Science and Engineering
In laser systems requiring a flat-top distribution of beam intensity, beam smoothing is a critical technology for enhancing laser energy deposition onto the focal spot.
Yamin Zheng, Yifan Zhang, Liquan Guo, Pei Li, Zichao Wang, Yongchen Zhuang, Shibing Lin, Qiao Xue, Deen Wang, Lei Huang   +9 more
doaj   +1 more source

Differential-Wavefront-Sensing Measurement with Detection Clipping and Wavefront Aberration

An analytical model of the Differential Wavefront Sensing (DWS) technique, based on the Gaussian beam model with a finite detection aperture and beam aberrations, has been derived. This model illustrates the influence on bias, response, and cross-talk in
Beichen Wang, Hsien-Chi Yeh, Xiaojie Wang, Linxia Liu, Huizong Duan, Kai-Hang Wu, Jiongyu Gao   +6 more
core   +1 more source

Advancing super‐resolution stimulated emission depletion microscopy with luminescent lanthanide nanocrystals

FlexMat, EarlyView.
The state‐of‐the‐art research advances and its cutting‐edge application in super resolution stimulated emission depletion technology based on luminescent lanthanide nanocrystals. Abstract Stimulated emission depletion (STED) microscopy overcomes the diffraction limit to reveal subcellular structures beyond the reach of conventional optical methods ...
Yaqi Chen, Tengfei Ma, Shuping Huang, Wei Guo, Yiming Wu   +4 more
wiley   +1 more source

Optimized Coherence Masking Improves Ultrasound Imaging of Kidney Cysts

Journal of Ultrasound in Medicine, EarlyView.
Objectives Renal cystic lesions are exceedingly common and typically benign, though accurate diagnostic techniques are required to recognize the subset of malignant lesions that require timely intervention. Ultrasound (US) is the preferred first line test for renal cyst evaluation because it is safe, widely accessible, and low cost. US imaging, however,
Scott Schoen Jr, Theodore T. Pierce, Sai Dhanush Reddy Jeggari, Abder‐Rhaman Ali, Kai E. Thomenius, Michael Wang, Brian Lause, Rimon Tadross, Kathleen Pope, David Hunt, Mary K. Peters, Mike Washburn, Anthony E. Samir   +12 more
wiley   +1 more source

Generating Helical Polymorphic Beams Using Dielectric Metasurfaces

Laser &Photonics Reviews, EarlyView.
Helix‐shaped polymorphic beams are optical fields whose intensity maxima spiral around the propagation axis, enabling particle manipulation through attractive or repulsive forces. Traditionally requiring expensive spatial light modulators, metasurfaces now provide a compact, cost‐effective alternative. This work demonstrates general helical polymorphic
Maryam Setareh, Yang Xu, Jose A. Rodrigo, Kenneth B. Crozier   +3 more
wiley   +1 more source

Aspherical Surface Measurement With Multi-Directional Lateral Shearing Phase-Shifting Interferometry

IEEE Photonics Journal
Lateral shearing interferometry is an effective method for directly measuring the depth gradient of aspherical surfaces. To address the low phase reconstruction accuracy resulting from the fact that lateral shear interferometers typically obtain only two
Yahui Zhu, Ailing Tian, Hongjun Wang, Bingcai Liu   +3 more
doaj   +1 more source

Invariance Properties and Measurement of Correlation Between Two Propagating or Evanescent Waves

Laser &Photonics Reviews, EarlyView.
This work analyses the strength of correlation between two propagating or evanescent plane waves generally expressed in different frames. Interferometric and nanoscattering‐based methods, respectively, are demonstrated for their measurement. The results show that the applied measure of correlation remains invariant under unitary polarization ...
Zhen Dong, Kimmo Saastamoinen, Andreas Norrman, Yahong Chen, Ari T. Friberg, Tero Setälä   +5 more
wiley   +1 more source