Composite vortex patterns formed by component light beams with non-integral topological charge

2008 ◽  
Author(s):  
E. J. Galvez ◽  
S. M. Baumann
Keyword(s):  
Topological Charge ◽  
Composite Vortex ◽  
Vortex Patterns ◽  
Light Beams

scholarly journals Topological charge and angular momentum of light beams carrying optical vortices

2004 ◽  
Author(s):  
M S Soskin ◽  
V N Gorshkov ◽  
M V Vasnctsov ◽  
J T Malos ◽  
N R Heckenberg
Keyword(s):  
Angular Momentum ◽  
Topological Charge ◽  
Optical Vortices ◽  
Light Beams

scholarly journals Topological charge and angular momentum of light beams carrying optical vortices

1997 ◽  
Vol 56 (5) ◽  
pp. 4064-4075 ◽  
Author(s):  
M. S. Soskin ◽  
V. N. Gorshkov ◽  
M. V. Vasnetsov ◽  
J. T. Malos ◽  
N. R. Heckenberg
Keyword(s):  
Angular Momentum ◽  
Topological Charge ◽  
Optical Vortices ◽  
Light Beams

scholarly journals Controlling the topological charge of twisted light beams with propagation

2016 ◽  
Vol 93 (6) ◽  
Author(s):  
Ahmed H. Dorrah ◽  
Michel Zamboni-Rached ◽  
Mo Mojahedi
Keyword(s):  
Topological Charge ◽  
Twisted Light ◽  
Light Beams

scholarly journals Determining Vortex-Beam Superpositions by Shear Interferometry

Photonics ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 16 ◽  
Author(s):  
Behzad Khajavi ◽  
Junior Ureta ◽  
Enrique Galvez
Keyword(s):  
Topological Charge ◽  
Effective Means ◽  
Optical Vortices ◽  
Vortex Beam ◽  
Mode Content ◽  
Optical Modes ◽  
Vital Component ◽  
Light Beams ◽  
Comparable Magnitude ◽  
Do So

Optical modes bearing optical vortices are important light systems in which to encode information. Optical vortices are robust features of optical beams that do not dissipate upon propagation. Thus, decoding the modal content of a beam is a vital component of the process. In this work, we present a method to decode modal superpositions of light beams that contain optical vortices. We do so using shear interferometry, which presents a simple and effective means of determining the vortex content of a beam, and extract the parameters of the component vortex modes that constitute them. We find that optical modes in a beam are easily determined. Its modal content can be extracted when they are of comparable magnitude. The use of modes of well-defined topological charge, but not well-defined radial-mode content, such as those produced by phase-only encoding, are much easier to diagnose than pure Laguerre–Gauss modes.

scholarly journals Time-varying optical vortices enabled by time-modulated metasurfaces

Nanophotonics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 2957-2976
Author(s):  
Hooman Barati Sedeh ◽  
Mohammad Mahdi Salary ◽  
Hossein Mosallaei
Keyword(s):  
Indium Tin Oxide ◽  
Topological Charge ◽  
Communication Systems ◽  
Structured Light ◽  
Angular Acceleration ◽  
Optical Vortices ◽  
Time Varying ◽  
Phase Gradient ◽  
Light Beams ◽  
Frequency Gradient

AbstractIn this paper, generation of optical vortices with time-varying orbital angular momentum (OAM) and topological charge is theoretically demonstrated based on time-modulated metasurfaces with a linearly azimuthal frequency gradient. The topological charge of such dynamic structured light beams is shown to continuously and periodically change with time evolution while possessing a linear dependence on time and azimuthal frequency offset. The temporal variation of OAM yields a self-torqued beam exhibiting a continuous angular acceleration of light. The phenomenon is attributed to the azimuthal phase gradient in space-time generated by virtue of the spatiotemporal coherent path in the interference between different frequencies. In order to numerically authenticate this newly introduced concept, a reflective dielectric metasurface is modelled consisting of silicon nanodisk heterostructures integrated with indium-tin-oxide and gate dielectric layers on top of a mirror-backed silicon slab which renders an electrically tunable guided mode resonance mirror in near-infrared regime. The metasurface is divided into several azimuthal sections wherein nanodisk heterostructures are interconnected via nanobars serving as biasing lines. Addressing azimuthal sections with radio-frequency biasing signals of different frequencies, the direct dynamic photonic transitions of leaky-guided modes are leveraged for realization of an azimuthal frequency gradient in the optical field. Generation of dynamic twisted light beams with time-varying OAM by the metasurface is verified via performing several numerical simulations. Moreover, the role of modulation waveform and frequency gradient on the temporal evolution and diversity of generated optical vortices is investigated which offer a robust electrical control over the number of dynamic beams and their degree of self-torque. Our results point toward a new class of structured light for time-division multiple access in optical and quantum communication systems as well as unprecedented optomechanical manipulation of objects.

Frequency Doubling Effect of Topological Charge of Composite Vortex in Frequency Doubling Process

2017 ◽  
Vol 54 (5) ◽  
pp. 051901
Author(s):  
赵媛丽 Zhao Yuanli ◽  
李方舒 Li Fangshu ◽  
邱晓东 Qiu Xiaodong ◽  
张武虹 Zhang Wuhong ◽  
炉庆洪 Lu Qinghong ◽  
...  
Keyword(s):  
Topological Charge ◽  
Frequency Doubling ◽  
Composite Vortex

scholarly journals Optical beams with an infinite number of vortices

2021 ◽  
Vol 45 (4) ◽  
pp. 490-496
Author(s):  
V.V. Kotlyar
Keyword(s):  
Angular Momentum ◽  
Cross Section ◽  
Data Transmission ◽  
Topological Charge ◽  
Laser Beams ◽  
Optical Data ◽  
Optical Vortices ◽  
Straight Line ◽  
Phase Singularities ◽  
Light Beams

In optical data transmission with using vortex laser beams, data can be encoded by the topo-logical charge, which is theoretically unlimited. However, the topological charge of a single sepa-rate vortex is limited by possibilities of its generating. Therefore, in this work, we analyze light beams with an unbounded (countable) set of optical vortices. The summary topological charge of such beams is infinite. Phase singularities (isolated intensity nulls) in such beams typically have a unit topological charge and reside equidistantly (or not equidistantly) on a straight line in the beam cross section. Such beams are form-invariant and, on propagation in space, change only in scale and rotate. Orbital angular momentum of such multivortex beams is finite, since only a finite number of optical vortices fall into the area, where the Gaussian beam has a notable intensity. Other phase singularities are located in the periphery (and at the infinity), where the intensity is almost zero.

Sign in / Sign up

Export Citation Format

Share Document