Results 61 to 70 of about 548,689 (195)

Measurement of intensity and polarization beatings in the interference of independent optical fields

Physical Review Research, 2020
We experimentally study the intensity and polarization beatings of interfering independent optical fields. Using the tools of intensity interferometry, we measure the beating harmonicity time and the degree of randomness of the polarization beating for ...
Andriy Shevchenko, Tero Setälä
doaj   +1 more source

Taming and the Poincaré conjecture

, 1978
L. Glaser and L. Siebenmann have shown that the double suspension of a homotopy 3-sphere is homeomorphic to the 5-sphere. This result, together with a well-known characterization of S 3 {S^3} due to R.
T. L. Thickstun
core   +1 more source

Effect of Magnetic Islands on Neoclassical Heat Diffusivity in a Global Tokamak Simulation

Contributions to Plasma Physics, EarlyView.
ABSTRACT Resonant magnetic perturbations (RMPs) alter magnetic field topology via island formation and can modify core transport in toroidal fusion devices. Using the global gyrokinetic particle‐in‐cell code XGC‐S, originally developed for stellarator geometries, we quantify how island topology affects neoclassical heat transport in a circular tokamak ...
Joseph X. Li, Toseo Moritaka, Ryutaro Kanno, Gakushi Kawamura, Robert Hager, C.‐S. Chang   +5 more
wiley   +1 more source

Programmable Multidimensional Diffraction Engineering via an Optically Addressed Nested Fourier Metasurface [PDF]

Nanophotonics
An optically addressed nested Fourier metasurface is presented for programmable multidimensional diffraction routing without electrical interconnects. Local Fourier‐mode engineering combined with global superlattice diffraction enables on‐demand reconfigurable routing.
Guo J, Zhao Q, Yang J, Liu Z, Zhu M, Liu S, Li C, Wang S, Hu Q, Guan F, Liu Q, Song Q.   +11 more
europepmc   +2 more sources

Poincaré sphere showing the location of the input polarizations (N = 200) used to study the dependence of the input polarization on the DoP-based images contrast.

, 2019
Poincaré sphere showing the location of the input polarizations (N = 200) used to study the dependence of the input polarization on the DoP-based images contrast.
Angel Lizana (3958997), Mercè Durfort (471067), José J. Gil (6459491), Enric Garcia-Caurel (2811841), Albert Van Eeckhout (5773847), Teresa Garnatje (664020), Juan Campos (3959000), Juan Carlos Escalera (6459488), Josep Vidal (631949)   +8 more
core   +1 more source

Diffraction‐Free Natural Optical Skyrmions and Their Subwavelength Confinement Around Vortices

Laser &Photonics Reviews, EarlyView.
ABSTRACT Diffraction causes waves to spread out as they propagate freely. The tighter the lateral confinement, the faster the spreading. Past research on how to suppress diffraction has been based on wave engineering and has led so far to idealized waves that, in real settings, eventually diffract.
Nilo Mata‐Cervera, Deepak K. Sharma, Ramon Paniagua‐Dominguez, Yijie Shen, Miguel A. Porras   +4 more
wiley   +1 more source

Visualization of electromagnetic-wave polarization evolution using the Poincaré sphere

, 2020
For the first time to the best of our knowledge, we derive expressions for coordinates of the trajectory on the Poincaré sphere that represent polarization evolution in an arbitrary beam of completely polarized light.
Chethiya Dissanayake, Ivan D Rukhlenko, Malin Premaratne   +2 more
core  

Polarization shaping of Poincaré beams by polariton oscillations [PDF]

, 2015
We propose theoretically and demonstrate experimentally the generation of light pulses whose polarization varies temporally to cover selected areas of the Poincaré sphere with both tunable swirling speed and total duration (1 ps and 10 ps, respectively ...
Bramati, Alberto, Valle Reboul, Elena del, Kavokin, Alexey V, del Valle, Elena, Shelykh, Ivan A., Kavokin, Alexey V., Liew, Timothy CH., Pervishko, Anastasiia A., de Giorgi, Milena, Giorgi, Milena de, Sanvitto, Daniele, Gigli, Giuseppe, Laussy, Fabrice P, Donati, Stefano, Colas, David, Liew, Timothy C. H., Ballarini, Dario, Colas, D., Laussy, Fabrice P., Dominici, Lorenzo, Liew, Timothy Chi Hin, Pervishko, Anastasiia A, Shelykh, Ivan A, Laussy FP, Liew TCH, Kavokin AV, De Giorgi M, Shelykh IA, Ballarini D, Donati S, Pervishko AA, Sanvitto D, Del Valle E, Gigli G, Bramati A, Dominici L, Colas D, Liew, Timothy Ch, Valle, Elena Del   +38 more
core   +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

Poincaré extension of Möbius transformations [PDF]

, 2017
Given sphere preserving (Möbius) transformations in n-dimensional Euclidean space one can use the Poincaré extension to obtain sphere preserving transformations in a half-space of n+1 dimensions.
Kisil, VV
core   +1 more source