Results 81 to 90 of about 2,243,893 (300)

Concurrent Terahertz Spin Excitations and Phase Shift Control in Fe4Nb2O9: A Material for Synergizing Computation and Communication Technologies

Advanced Science, EarlyView.
A multifunctional terahertz (THz) platform is demonstrated, in a model material Fe4Nb2O9, exhibiting a large intrinsic THz phase shift alongside distinct THz magnon excitations in its antiferromagnetic phase. This coexistence of phase modulation and spin dynamics offers a promising pathway toward integrated THz communication and magnonic computation ...
Brijesh Singh Mehra, Karan Datt Sharma, Sanjeev Kumar, Gaurav Dubey, Mitanshi Gupta, Ravi Shankar Singh, Dibakar Roy Chowdhury, Christine Martin, Antoine Maignan, Kiran Singh, Dhanvir Singh Rana   +10 more
wiley   +1 more source

Optical design of infrared pyramid wavefront sensor for the MMT

, 2017
We report the optical design of an infrared (0.85-1.8 \u3bcm) pyramid wavefront sensor (IRPWFS) that is designed for the 6.5m MMT on telescope adaptive optics system using the latest developments in low-noise infrared avalanche photodiode arrays.
Lardi\ue8re, Olivier, Shaojie Chen, Veran, Jean-Pierre, Lardière, Olivier, Jean-Pierre Veran, Chen, Shaojie, Hinz, Philip M., Tim Hardy, Olivier Lardière, Suresh Sivanandam, Philip M. Hinz, Hardy, Tim, Etsuko Mieda, Sivanandam, Suresh, Siqi Liu, Liu, Siqi, Mieda, Etsuko   +16 more
core   +1 more source

Integrated Ultrasonic Platform for Bioelectronic Control through Biological Barriers Based on Metasurface

Advanced Science, EarlyView.
A metasurface‐enabled ultrasonic platform achieves precise multi‐focal control through biological barriers, real‐time physiology‐driven modulation, and simultaneous wireless power and data transmission. By unifying wavefront engineering, closed‐loop feedback, and acoustic communication, this work establishes key enabling technologies toward scalable ...
Chuanxin Zhang, Hanjie Xiao, Xue Jiang, Dean Ta   +3 more
wiley   +1 more source

Curvature sensor for ocular wavefront measurement

Optics Letters, 2006
We describe a new wavefront sensor for ocular aberration determination, based on the curvature sensing principle, which adapts the classical system used in astronomy for the living eye's measurements. The actual experimental setup is presented and designed following a process guided by computer simulations to adjust the design parameters for optimal ...
Díaz Douton, Fernando, Pujol Ramo, Jaume, Arjona Carbonell, Mª Montserrat, Luque, Sergio Oscar   +3 more
openaire   +3 more sources

Metasurface‐Enabled Active‐Like Passive Radar

Advanced Science, EarlyView.
A programmable space‐time‐coding metasurface embeds distinct spatiotemporal tags into ambient wireless signals, allowing passive radar to operate in an active‐like manner. By enabling code‐correlated reconstruction under interference, the approach supports robust real‐time UAV tracking in complex environments and points to intelligent, low‐power ...
Mingyi Li, Jiawen Xu, Hanting Zhao, Xu Zhao, Yanjin Chen, Tie Jun Cui, Vincenzo Galdi, Lianlin Li   +7 more
wiley   +1 more source

Characterization of the digital holographic wavefront sensor

, 2014
Paper 92421T, 14 S.Correction of atmospheric effects on the propagation of laser light can be achieved with adaptive optics (AO) by relying on adequate wavefront sensors. For free-space laser communications and for tracking of high-speed airborne objects,
Gladysz, Szymon, Zepp, A., Gladysz, S., Marin Palomo, Pablo, Zepp, Andreas, Szymon Gładysz, Marin-Palomo, P., Pablo Marin Palomo, Andreas Zepp   +8 more
core   +1 more source

TRIM: Simultaneous Thermometry, Ranging, and Imaging via a Monolithic Metalens

Advanced Science, EarlyView.
ABSTRACT While metasurfaces offer a pathway beyond the discrete architectures of conventional LWIR systems, physically fusing high‐precision thermometry and passive ranging onto a single metalens remains a formidable challenge. Here, we demonstrate a monolithic, dual‐focus metalens capable of simultaneous multidimensional sensing.
Man Yuan, Yuqing Zhang, Wangzhe Zhou, Zhaojian Zhang, Xiaoyun He, Xinpeng Jiang, Yiyi Li, Xin He, Jiagui Wu, Yuanmu Yang, Junbo Yang   +10 more
wiley   +1 more source

Sensing and control of segmented mirrors with a pyramid wavefront sensor in the presence of spiders [PDF]

, 2018
The segmentation of the telescope pupil (by spiders & the segmented M4) create areas of phase isolated by the width of the spiders on the wavefront sensor (WFS), breaking the spatial continuity of the wavefront.
N. Schwartz, J. Sauvage, C. Correia, C. Petit, F. Quirós-Pacheco, T. Fusco, K. Dohlen, K. E. Hadi, N. Thatte, F. Clarke, J. Paufique, J. Vernet   +11 more
semanticscholar   +1 more source

Extreme‐Thickness Meta‐Membrane for Controlling Terahertz Vectorial Beams

Advanced Science, EarlyView.
We propose ultra‐thin (λ/30) transmissive terahertz metasurfaces combining near‐field resonant and detour phases in coupled‐slit meta‐atoms, enabling continuous phase and polarization control beyond conventional designs. Based on leaky‐mode theory, scalar and vectorial terahertz Bessel beams at 0.39 THz are experimentally demonstrated, with ...
Yufei Song, Yixiang Xu, Yikai Xu, Yuanxi Liu, Shaojie Ma, Qiong He, Zhuo Wang, Lei Zhou   +7 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