Results 31 to 40 of about 7,684 (263)

Simulation of superresolution holography for optical tweezers [PDF]

, 2008
Optical tweezers manipulate microscopic particles using foci of light beams. Their performance is therefore limited by diffraction. Using computer simulations of a model system, we investigate the application of superresolution holography for two ...
Thomson, L.C., Boissel, Yannick, Yao, E., Thomson, Laura C., Yannick Boissel, Eric Yao, Johannes Courtial, Yao, Eric, Laura C Thomson, Courtial, J., Whyte, G., Graeme Whyte, Whyte, Graeme, Courtial, Johannes, Boissel, Y.   +14 more
core   +1 more source

Optical trapping with a perfect vortex beam

, 2014
The authors would like to thank the UK Engineering and Physical Sciences Research Council (EPSRC) for funding.Vortex beams with different topological charge usually have different profiles and radii of peak intensity.
Arita, Yoshihiko, Ewan M. Wright, Wright, Ewan M., Michael Mazilu, Chen, Mingzhou, Mazilu, Michael, Dholakia, Kishan, Yoshihiko Arita, Mingzhou Chen, Kishan Dholakia   +9 more
core   +1 more source

Observation of a Nonlocal Optical Vortex

Physical Review Letters, 2009
We report the observation of an optical vortex in the correlations of photons produced from spontaneous parametric down-conversion. The singularity appears in a nonlocal coordinate plane consisting of 1 degree of freedom of each photon.
R M, Gomes, A, Salles, F, Toscano, P H Souto, Ribeiro, S P, Walborn   +4 more
openaire   +3 more sources

Optical vortex braiding with Bessel beams

Optics Letters, 2020
We propose the braiding of optical vortices in a laser beam with more than 2 π rotation by superposing Bessel modes with a plane wave. We experimentally demonstrate this by using a Bessel–Gaussian beam and a coaxial Gaussian, and we present measurements of three complete braids. The amount of braiding is fundamentally limited only
Andrew A. Voitiv, Jasmine M. Andersen, Mark E. Siemens, Mark T. Lusk   +3 more
openaire   +3 more sources

Modulation of orbital angular momentum of vortex beam based on ordered pinhole screens

Results in Physics, 2023
Optical vortex phase beams have unique amplitudes and phase distributions, rendering them sensitive to the position and symmetry of modulating structures. This sensitivity can facilitate their applicability to optical communications.
Jinlong Zhang, Kaibo Yang, Hao Luo, Peng Li, Feng Wen, Yuzong Gu, Zhenkun Wu   +6 more
doaj   +1 more source

Perfect Optical Vortex to Produce Controllable Spot Array

Frontiers in Physics, 2022
The perfect optical vortex has successfully aroused substantial interest from researchers for its central dark hollow caused by spatial phase singularity in recent years.
Xiaotong Jiang, Yuyuan Tian, Meiyu Sun, Zhigang Li, Dengying Zhang, Kunjian Cao, Qiang Shi, Qiang Shi, Linwei Zhu   +8 more
doaj   +1 more source

Generating Optical Vortex Array Laser Beams of Superimposing Hermite–Gaussian Beams with a Dual–Phase Modulation Digital Laser System

Photonics
This study presents an efficient and practical intra-cavity approach for selectively generating vortex array laser beams employing a dual-phase modulation digital laser system, which has not yet been completed in single-phase modulation digital laser ...
Ly Ly Nguyen Thi, Ko-Fan Tsai, Shu-Chun Chu   +2 more
doaj   +1 more source

Propagation and Transformation of Vortexes in Linear and Nonlinear Radio-Photon Systems

Fibers, 2022
The article is devoted to issues related to the propagation and transformation of vortexes in the optical range of frequency. Within the framework of the traditional and modified model of slowly varying envelope approximation (SVEA), the process of ...
Valery H. Bagmanov, Albert Kh. Sultanov, Ivan K. Meshkov, Azat R. Gizatulin, Raoul R. Nigmatullin, Airat Zh. Sakhabutdinov   +5 more
doaj   +1 more source

Topological events on wave dislocation lines: birth and death of small loops, and reconnection

, 2007
In three-dimensional space, a wave dislocation, that is, a quantized (optical) vortex or phase singularity, is a line zero of a complex scalar wavefunction.
Dennis, MR, Berry, MV, Dennis, M.R., Berry, M V, Dennis, M R; id_orcid, Berry, M.V.   +5 more
core   +1 more source

Superposition of Optical Vortex Beams for Polarization Measurement

IEEE Photonics Journal, 2021
Polarization measurement has found applications in many fields ranging from quantum science to our daily life. However, traditional polarization measurement systems suffer from large volume and high cost.
Zhongqiang Zhang, Jin Han, Di Geng, Yurong Wang, Aning Ma   +4 more
doaj   +1 more source