Results 61 to 70 of about 48,988 (289)

Active Adjustment of the Subreflector Shape for the Large Dual-Reflector Antenna

Micromachines, 2023
A shape adjustment method for subreflectors based on minimizing the residual wavefront error of the large dual-reflector antenna is presented. This method is used to compensate for the antenna structural deformation caused by environment loading.
Binbin Xiang, Tianxiang Zheng, Wei Wang, Peiyuan Lian, Guljaina Kazezkhan, Jianping Zhou, Kai Li   +6 more
doaj   +1 more source

Single-photon entanglement generation by wavefront shaping in a multiple-scattering medium

, 2014
We demonstrate the control of entanglement of a single photon between several spatial modes propagating through a strongly scattering medium. Measurement of the scattering matrix allows the wavefront of the photon to be shaped to compensate the ...
Barbieri, Marco, Chalopin, Benoit, Chatel, Beatrice, Defienne, Hugo, Gigan, Sylvain, Smith, Brian J., Walmsley, Ian A.   +6 more
core   +3 more sources

LFA: A Lattice Fourier Analyzer for Quantitative In Situ EC‐STM of Adsorbate–Substrate Superstructures

Advanced Materials Interfaces, EarlyView.
Although electrochemical scanning tunneling microscopy provides atomic‐scale access to electrified interfaces, quantitative in situ and operando investigations suffer from drift‐induced distortions. This work introduces the Lattice Fourier Analyzer (LFA), which employs substrate‐anchored affine drift correction in reciprocal space to recover precise ...
Rafał Lewandków, Paulina Wira, Anna Futyma, Radosław Wasielewski, Tomasz Kosmala   +4 more
wiley   +1 more source

Predictive control of thermally induced wavefront aberrations

Optics Express, 2013
In this paper we experimentally demonstrate the proof of concept for predictive control of thermally induced wavefront aberrations in optical systems. On the basis of the model of thermally induced wavefront aberrations and using only past wavefront measurements, the proposed adaptive optics controller is able to predict and to compensate the future ...
Haber, A. (author), Polo, A. (author), Maj, I. (author), Pereira, S.F. (author), Urbach, H.P. (author), Verhagen, M.H.G. (author)   +5 more
openaire   +4 more sources

The coronagraphic Modal Wavefront Sensor: a hybrid focal-plane sensor for the high-contrast imaging of circumstellar environments [PDF]

, 2016
The raw coronagraphic performance of current high-contrast imaging instruments is limited by the presence of a quasi-static speckle (QSS) background, resulting from instrumental non-common path errors (NCPEs).
Keller, Christoph U., Korkiakoski, Visa, Pietrow, Alexander G. M., Snik, Frans, Wilby, Michael J.   +4 more
core   +3 more sources

Transducers Across Scales and Frequencies: A System‐Level Framework for Multiphysics Integration and Co‐Design

Advanced Materials Technologies, EarlyView.
Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu, Mengyao Xiao, Zhouli Sui, Yinpeng Wang, Daoye Zheng, Yuxin Liu, Luwei Wang, Huajun Liu, Chengkuo Lee   +8 more
wiley   +1 more source

Broadband High-Efficiency Co-Polarized Wavefront Manipulation Based on Multi-Layered Metasurface for Terahertz Wave

IEEE Access
Metasurfaces can achieve multifunctional wavefront control, but most co-polarized metasurfaces can only achieve a 360° phase coverage at specific frequency points. In this paper, we propose a metasurface with efficient co-polarized Terahertz (THz)
Su Zong, Jiajun Liang
doaj   +1 more source

Collaborative development of diffraction-limited beamline optical systems at US DOE light sources [PDF]

, 2019
An ongoing collaboration among four US Department of Energy (DOE) National Laboratories has demonstrated key technology prototypes and software modeling tools required for new high-coherent flux beamline optical systems. New free electron laser (FEL) and
Assoufid, L, Bryant, D, Chao, W, Cocco, D, Goldberg, KA, Grizolli, W, Hardin, C, Huang, L, Idir, M, Kearney, SP, Lee, L, Morton, D, Ng, ML, Shi, X, Shu, D, Shvyd'Ko, Y, Wojcik, M, Wojdyla, A   +17 more
core  

Mapping of Physiological Signals From Wireless Battery‐Free Implants With Plane‐Wave Ultrasound Imaging

Advanced Materials Technologies, EarlyView.
Combined approach of electromagnetic (Power) and ultrasound (data harvesting) waves is proposed to address the miniaturized ultrasonic implants. Electromagnetic waves trigger the piezoelectric element to generate the acoustic pulse which is modulated by the variations in the sensor's impedance.
Anam Bhatti, Hugo Guillot, Ouafae Firdaouissi, Mohammed Irar, Lionel Rousseau, Clément Hébert, Maxime Lafond   +6 more
wiley   +1 more source

Time-reversed optical focusing through scattering media by digital full phase and amplitude recovery using a single phase-only SLM [PDF]

Journal of Innovative Optical Health Sciences, 2015
Focusing light though scattering media beyond the ballistic regime is a challenging task in biomedical optical imaging. This challenge can be overcome by wavefront shaping technique, in which a time-reversed (TR) wavefront of scattered light is generated
Qiang Yang, Xinzhu Sang, Daxiong Xu
doaj   +1 more source