Results 111 to 120 of about 26,873 (277)

Electric Field Conjugation with the Project 1640 coronagraph

, 2013
The Project 1640 instrument on the 200-inch Hale telescope at Palomar Observatory is a coronagraphic instrument with an integral field spectrograph at the back end, designed to find young, self-luminous planets around nearby stars. To reach the necessary
Baranec, Christoph, Beichman, Charles, Brenner, Douglas, Burruss, Rick, Cady, Eric, Crepp, Justin, Dekany, Richard, Hale, David, Hillenbrand, Lynne, Hinkley, Sasha, Ligon, E. Robert, Lockhart, Thomas, Oppenheimer, Ben R., Parry, Ian, Pueyo, Laurent, Rice, Emily, Roberts, Jennifer, Roberts, Jr., Lewis C., Shao, Michael, Sivaramakrishnan, Anand, Soummer, Remi, Tang, Hong, Truong, Tuan, Vasisht, Gautam, Vescelus, Fred, Wallace, J. Kent, Zhai, Chengxing, Zimmerman, Neil   +27 more
core   +1 more source

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

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, Oleg, Soloviev, Mikhail, Loktev   +2 more
openaire   +2 more sources

Wavefront sensing from the image domain with the Oxford-SWIFT integral field spectrograph

, 2014
The limits for adaptive-optics (AO) imaging at high contrast and high resolution are determined by residual phase errors from non-common-path aberrations not sensed by the wavefront sensor, especially for integral field spectrographs, where phase ...
Burruss, Rick, Clarke, Fraser, Cotter, Garret, Pope, Benjamin, Tecza, Matthias, Thatte, Niranjan   +5 more
core   +1 more source

Recent Advances in Programmable Metasurfaces and Meta‐Devices

Advanced Electronic Materials, EarlyView.
Programmable metasurfaces enable various novel functionalities by dynamically tuning electromagnetic wavefronts. This article provides a comprehensive review of recent advances in microwave and terahertz programmable metasurfaces, covering electrical, thermal, optical, and mechanical control mechanisms.
Linda Shao, Chong He, Nan Wang, Liming Si, Weiren Zhu   +4 more
wiley   +1 more source

Study of Point Scanning Detection Mechanisms for Vibration Signals with Wavefront Sensors

Photonics
Seismic wave laser remote sensing is extensively employed in seismic monitoring and resource exploitation. This work establishes a vibration signal point scanning detection system utilizing wavefront sensors, leveraging their high resolution, array ...
Quan Luo, Hongsheng Luo, Yiyou Fan, Guihan Wu, Haoming Chen, Yun Pan, Wei Jiang, Jinshan Su   +7 more
doaj   +1 more source

Linearity of the pyramid wavefront sensor

Optics Express, 2006
The pyramid wavefront sensor is very similar to the Fourier knife-edge test, but employs dynamic modulation to quantify the phase derivative. For circular modulation, we compare approximate geometrical optics calculations, more exact diffraction calculations, and experimental results.
Anna, Burvall, Elizabeth, Daly, Stéphane R, Chamot, Christopher, Dainty   +3 more
openaire   +2 more sources

Chronic Disease Monitoring Using Advanced Compliant Materials for Bioelectronics

Advanced Electronic Materials, EarlyView.
Compliant bioelectronic systems enable continuous monitoring of chronic disease through soft, stretchable materials and tissue‐conformal designs that support stable electrophysiological, mechanical, and biochemical sensing. Integration of diverse sensing modalities with thoughtful material selection, device architectures, and advanced fabrication ...
Han Kim, Mabel Bartlett, Liyang Wang, Karl Bates, Mengdi He, Myungbo Kim, Carmel Majidi, Tzahi Cohen‐Karni   +7 more
wiley   +1 more source

Widefield wavefront sensor for multidirectional peripheral retinal scanning. [PDF]

Biomed Opt Express, 2023
Pusti D, Degre Kendrick C, Wu Y, Ji Q, Jung HW, Yoon G.   +5 more
europepmc   +1 more source

High-resolution imaging and spectroscopy in the visible from large ground-based telescopes with natural guide stars

, 2010
Near-diffraction limited imaging and spectroscopy in the visible on large (8-10 meter) class telescopes has proved to be beyond the capabilities of current adaptive optics technologies, even when using laser guide stars.
King, David, Mackay, Craig, Staley, Tim D., Suess, Frank, Weller, Keith   +4 more
core   +1 more source