Destroying and recovering spiral vortex beams due to figured perturbations

2021 ◽  
Author(s):  
Alexander Volyar ◽  
Eugeny Abramochkin ◽  
Yana Akimova ◽  
Mikhail Bretsko
Keyword(s):  
Spiral Vortex ◽  
Vortex Beams

Structural stability of spiral vortex beams to sector perturbations

2021 ◽  
Vol 60 (28) ◽  
pp. 8865
Author(s):  
Alexander Volyar ◽  
Yana Akimova
Keyword(s):  
Structural Stability ◽  
Spiral Vortex ◽  
Vortex Beams

Structured Light and Darkness in Spiral Vortex Beams

2021 ◽  
Author(s):  
Alexander Volyar ◽  
Evgeny Abramochkin ◽  
Evgeniya Razueva ◽  
Mihail Bretsko ◽  
Yana Akimova ◽  
...  
Keyword(s):  
Structured Light ◽  
Spiral Vortex ◽  
Vortex Beams

scholarly journals Structural stability of spiral beams and fine structure of an energy flow

2021 ◽  
Vol 45 (4) ◽  
pp. 482-489
Author(s):  
A.V. Volyar ◽  
E.G. Abramochkin ◽  
E.V. Razueva ◽  
Ya.E. Akimova ◽  
M.V. Bretsko
Keyword(s):  
Structural Stability ◽  
Critical Points ◽  
Degrees Of Freedom ◽  
Light Flux ◽  
Special Role ◽  
Quantum Numbers ◽  
Energy Flows ◽  
Spiral Vortex ◽  
Vortex Beams ◽  
Spiral Beam

The problem of structural stability of wave systems with great numbers of degrees of freedom directly concerns the issue of redistribution of energy fluxes in structured vortex beams that ensure their stability under propagating and focusing. A special place in this variety is occupied by spiral vortex beams capable of mapping complex figures, letters and even words. Spiral beams contain an infinite set of Laguerre-Gauss beams with a strong sequence of topological charges and radial numbers, their amplitudes and phases are tightly matched. Therefore, the problem of structural stability plays a special role for their applications. Using a combination of theory and computer simulation, supported by experiment, we ana-lyzed the structure of critical points in energy flows for two main types of spiral beams: triangular beams with zero radial number and triangular beams with complex framing of their faces with both quantum numbers. Structural stability is provided by triads of critical points, both inside and outside the triangle, which direct the light flux along the triangular generatrix and hold the framing when rotating the beam. The experiment showed that a simple triangular spiral beam turns out to be stable even with small alignment inaccuracies, whereas a complex triangular beam with a fram-ing requires careful alignment.

scholarly journals Generation of terahertz superimposed perfect vortex beams

2021 ◽  
pp. 1-1
Author(s):  
Yongqiang Yang ◽  
Tianyi Wang ◽  
Kejia Wang ◽  
Zhengang Yang ◽  
Jinsong Liu
Keyword(s):  
Vortex Beams

scholarly journals Subwavelength Acoustic Vortex Beams Using Self-Demodulation

2021 ◽  
Vol 15 (5) ◽  
Author(s):  
Noé Jiménez ◽  
Joao Ealo ◽  
Rubén D. Muelas-Hurtado ◽  
Aroune Duclos ◽  
Vicent Romero-García
Keyword(s):  
Vortex Beams

scholarly journals High-Efficiency Spin-Related Vortex Metalenses

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1485
Author(s):  
Wei Wang ◽  
Ruikang Zhao ◽  
Shilong Chang ◽  
Jing Li ◽  
Yan Shi ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Topological Charge ◽  
High Efficiency ◽  
Infrared Band ◽  
Mid Infrared ◽  
Integrated Devices ◽  
Vortex Beams ◽  
Topological Charges

In this paper, one spin-selected vortex metalens composed of silicon nanobricks is designed and numerically investigated at the mid-infrared band, which can produce vortex beams with different topological charges and achieve different spin lights simultaneously. Another type of spin-independent vortex metalens is also designed, which can focus the vortex beams with the same topological charge at the same position for different spin lights, respectively. Both of the two vortex metalenses can achieve high-efficiency focusing for different spin lights. In addition, the spin-to-orbital angular momentum conversion through the vortex metalens is also discussed in detail. Our work facilitates the establishment of high-efficiency spin-related integrated devices, which is significant for the development of vortex optics and spin optics.

scholarly journals Total Angular Momentum Dichroism of the Terahertz Vortex Beams at the Antiferromagnetic Resonances

2021 ◽  
Vol 126 (15) ◽  
Author(s):  
A. A. Sirenko ◽  
P. Marsik ◽  
L. Bugnon ◽  
M. Soulier ◽  
C. Bernhard ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Total Angular Momentum ◽  
Vortex Beams

scholarly journals A mode generator and multiplexer at visible wavelength based on all-fiber mode selective coupler

Nanophotonics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 973-981 ◽  
Author(s):  
Han Yao ◽  
Fan Shi ◽  
Zhaoyang Wu ◽  
Xinzhu Xu ◽  
Teng Wang ◽  
...  
Keyword(s):  
Phase Shift ◽  
Intensity Distribution ◽  
Linear Polarization ◽  
Mode Conversion ◽  
Polarization State ◽  
Stimulated Emission ◽  
Wavelength Multiplexing ◽  
Mode Converters ◽  
Fiber Mode ◽  
Vortex Beams

AbstractUsing an all-fiber mode selective coupler (MSC) at the visible band, here we experimentally demonstrate a generating and wavelength multiplexing scheme for the cylindrical vector (CV) and vortex beams (VBs). The proposed MSCs act as efficient mode converters to produce spectrally insensitive high-order modes (HOMs) at the wavelength ranging from 450 to 980 nm, which have broad operation bandwidth (more than 7 nm), high mode conversion efficiency (94%), and purity (98%), and low insert loss (below 0.5 dB). By adjusting the polarization state and the phase shift of linear polarization (LP)11 mode respectively, the donut-shaped CVs and circular-polarization VBs are achieved. The focused intensity distribution of the donut beam on the cross- and axial-sections is monitored by using a confocal system. The all-fiber solution of producing and multiplexing HOMs opens a new route for stimulated emission depletion microscopy applications.

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