Results 191 to 200 of about 68,202 (308)

Complex Reflectivity Modulation Characteristics at Visible Wavelength Using Liquid Crystal on a Metasurface Device

Advanced Photonics Research, Volume 6, Issue 4, April 2025.
A liquid crystal of twisted nematic mode on a plasmonic antenna metasurface device modulates complex reflectivity with a small voltage variation of 3.1 V on the antenna electrode and 2.5 V on the metal electrode. The largest complex modulation is at a wavelength of 660 nm with phase and reflectivity amplitude modulations of 0–2π radian and 0.3 and 0.6,
Yong‐Hae Kim, Kyunghee Choi, Jaehyun Moon, Jong‐Heon Yang, Jae‐Eun Pi, Ji‐Hun Choi, Chi‐Sun Hwang, Jeong‐Seon Yu, Jong‐Hyun Kim   +8 more
wiley   +1 more source

Single to multiple digital holograms for phase compensation and defect detection

Frontiers in Photonics
Digital holography enables quantitative phase imaging based on interference. A digital hologram often encodes the phase information along with aberrations or deformations.
Zhenkai Chen, Wenjing Zhou, Zhou Ge, Yingjie Yu, Hongbo Zhang, Ting-Chung Poon   +5 more
doaj   +1 more source

Nonlinear Transformation of Images and Infrared Holography [PDF]

, 1970
É.S. Voronin
openalex   +1 more source

Ultrafast All‐Optical Switching and Active Sub‐Cycle Waveform Control via Time‐Variant Photodoping of Terahertz Metasurfaces

Advanced Science, Volume 12, Issue 14, April 10, 2025.
This study introduces a novel time‐resolved spectroscopy approach enabling ultrafast terahertz (THz) modulation in silicon‐based optical switches. Utilizing photon‐induced processes, it achieves a record THz switching time of 1.3 ps and a modulation depth over 500%. The method demonstrates active sub‐cycle pulse control, offering a new pathway for high‐
Jeongmin Jang, Junsuk Rho, Hee Jun Shin
wiley   +1 more source

METHOD FOR PLANE NEAR-FIELD ACOUSTIC HOLOGRAPHY BASED ON COMPRESSIVE SAMPLING AND ITS APPLICATION

Jixie qiangdu, 2016
In traditional plane near-field acoustic holography reconstruction process,regardless of wave number domain filter or regularization method,they cannot solve their own ill-posed problem,and thus cannot improve the reconstruction accuracy.
DU Bao, LUO Jian, HU Fei, LIU XiaoQin, WU Xing   +4 more
doaj  

Moving, computer-generated images via integral holography [PDF]

, 1977
Douglas Vickers, Gordon S. Smith, S. R. Levine, L. G. Cross   +3 more
openalex   +1 more source

Dynamic Steerable Patterning of Microscale Particles and Living Cells Using an Ultrasound‐Phased Array

Advanced NanoBiomed Research, Volume 5, Issue 4, April 2025.
Ultrasound transducers can be used to pattern microscale particles. Herein, it is shown that dynamic patterning, i.e., varying pattern location and direction using transmit beamforming, can be achieved using a (clinical)‐phased array transducer without the need for a reflector. Moreover, initial acoustic patterning results on living cells are presented,
Rick J. P. van Bergen, Bart G. W. Groenen, Daniëlle C. A. Duffhues, Richard G. P. Lopata, Carlijn V. C. Bouten, Hans‐Martin Schwab   +5 more
wiley   +1 more source

Dynamic interactive bitwise meta-holography with ultra-high computational and display frame rates

Opto-Electronic Advances
Interactive holography offers unmatched levels of immersion and user engagement in the field of future display. Despite of the substantial progress has been made in dynamic meta-holography, the realization of real-time, highly smooth interactive ...
Yuncheng Liu, Ke Xu, Xuhao Fan, Xinger Wang, Xuan Yu, Wei Xiong, Hui Gao   +6 more
doaj   +1 more source

Dual‐coupling networks engineering of self‐assembled ferromagnetic microspheres with enhanced interfacial polarization and magnetic interaction for microwave absorption

InfoMat, Volume 7, Issue 4, April 2025.
The hierarchical Fe3O4@C microspheres assembled by abundant core‐shell nano‐spindles are synthesized through a facile spray‐drying method. Originated from strong dielectric and magnetic dual‐coupling networks, the ferromagnetic microspheres exhibited multiple loss mechanisms including interfacial polarization and magnetic interactions, thereby ...
Chunyang Xu, Xuhui Xiong, Yiqian Du, Xiaowei Lv, Zhengchen Wu, Kaicheng Luo, Yuetong Qian, Renchao Che   +7 more
wiley   +1 more source

Sourcing the Kerr Geometry

Fortschritte der Physik, Volume 73, Issue 4, April 2025.
Abstract The Kerr metric is a vacuum solution of the Einstein equations outside of a rotating black hole (BH), but what interior matter is actually rotating and sourcing the Kerr geometry? Here, a rotating exotic matter is described, which can source the Kerr geometry for the entire acceptable range of its spin parameter and be shown to saturate the ...
Ram Brustein, A.J.M. Medved
wiley   +1 more source