Results 31 to 40 of about 3,373,896 (159)

Transverse spin angular momentum of tightly focused full Poincaré beams.

Optics Express, 2015
We show theoretically that by tightly focusing a full Poincaré beam one can create states of light whose average spin angular momentum (SAM) is purely transverse.
Weiren Zhu, V. Shvedov, W. She, W. Krolikowski   +3 more
semanticscholar   +1 more source

Dual‐Metasurface‐Integrated Fiber Array for Bidirectional Cylindrical‐Vector‐Beam Multiplexed Communication Using Off‐Axis Spatial Manipulation

Laser &Photonics Reviews, EarlyView.
A dual‐layer metasurface is integrated on a fiber‐array facet to realize compact, plug‐and‐play free‐space optical links with cylindrical vector beam (CVB) space‐division multiplexing. An optimized off‐axis collimation layer steers multiple channels, while a Dammann vortex layer performs polarization–topology conversion for bidirectional CVB (de ...
Xipeng Lu, Jinke Li, Jin Tae Kim, Shaoyan Li, Hongliang Li, Duk‐Yong Choi, Sang‐Shin Lee   +6 more
wiley   +1 more source

Polarization Strips in the Focus of a Generalized Poincaré Beam

Photonics
We analyze the tight focusing of a generalized Poincaré beam using a Richards–Wolf formalism. Conventional Poincaré beams are superpositions of two Laguerre–Gaussian beams with orthogonal polarization, while the generalized Poincaré beams are composed of
Victor V. Kotlyar, Alexey A. Kovalev, Alexey M. Telegin, Elena Sergeevna Kozlova   +3 more
doaj   +1 more source

Rotating full poincare beams

International Conference on Advanced Optoelectronics and Lasers, 2016
We demonstrate numerically the existence and dynamical properties of rotating full Poincare beams (RFP) generated spontaneously or by injection in an isotropic laser which contains no selective elements except circular diaphragm that controls the Fresnel
Ye. A. Krasnoshchekov, V. V. Yaparov, V. Taranenko   +2 more
semanticscholar   +1 more source

Reconfigurable Geometric Phase Matching by Multilayered Nonlinear Thin‐Film Crystals

Laser &Photonics Reviews, EarlyView.
The concept of geometric phase matching is demonstrated as a dynamically reconfigurable approach for tunable nonlinear wave mixing in multilayered nonlinear thin‐film crystals. Experimental results reveal full modulation in a bilayer structure and near‐perfect spin‐selective phase matching of second‐harmonic generation in an eight‐layer configuration ...
Danielle Ben‐Haim, Mai Tal, Xiaoxi Xu, Tal Ellenbogen   +3 more
wiley   +1 more source

Drive‐Efficient GHz‐Rate Binary‐State Updates Enabled by VCSEL Polarization Switching

Laser &Photonics Reviews, EarlyView.
Photonic computing needs a compact node that can hold a binary state and update it fast. A vertical‐cavity surface‐emitting laser biased at its polarization‐switching point could serve as one: its two orthogonal linear polarizations are the two states, and a small electrical drive is enough to move the output from one state to the other at gigahertz ...
Zifeng Yuan, Beibei Lin, Yutong Liu, Wujie Fu, Yuan Gao, Tingting Chen, Aaron Danner   +6 more
wiley   +1 more source

On the overall polarisation properties of Poincaré beams [PDF]

Journal of Optics, 2019
We analyse the polarisation properties of Poincaré beams. We consider different configurations, such as Laguerre–Poincaré (LP), Bessel–Poincaré (BP), and Lambert–Poincaré (LaP) beams.
D. Lopez-Mago
semanticscholar   +1 more source

Chip Scale Emission of Blue Light at Elevated Temperatures in Optical Waveguides Integrated With Rubidium Vapor

Laser &Photonics Reviews, EarlyView.
An integrated atom‐clad waveguide enables chip‐scale blue light generation (420 nm) via a two‐photon ladder transition in rubidium vapor at temperatures up to 240°C. The observed bell‐shaped intensity profile reveals a competitive interplay between local photon generation and macroscopic vapor reabsorption.
Arieh Grosman, Ilan Sher, Roy Zektzer, Noa Mazurski, Uriel Levy   +4 more
wiley   +1 more source

Skyrmion number for a generalized vector Poincaré beam

Компьютерная оптика
We investigate two initial vector Poincaré-type light fields that can be treated as optical skyrmions – topological quasiparticles. For such fields, explicit expressions are obtained for the components of a 3D-vector skyrmionic field in the initial plane
V.V. Kotlyar, A.A. Kovalev , A.M. Telegin   +2 more
doaj   +1 more source

Dynamic Analysis of Electrically Assisted Turbocharger Rotor Considering Contact Effects in Nut Structures

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT The rotor system of an electrically assisted turbocharger (EAT) is composed of multiple shaft components; The nonlinear connection and contact effects make it difficult to determine the system dynamic characteristics. To improve the modeling accuracy of EAT rotor system and evaluate the influence of contact between multi‐axis components and ...
Wenchao Liang, Shuqian Cao, Xiaolin Cao, Mingyue Hu, Yanhong Kang, Tianyou Wang   +5 more
wiley   +1 more source