Generation of surface optical vortices by evanescent Bessel beams

2012 ◽  
Vol 7 (25) ◽  
Author(s):  
S. Al-Awfi
Keyword(s):  
Optical Vortices ◽  
Bessel Beams ◽  
Surface Optical

Propagation of Bessel beams carrying optical vortices

2002 ◽  
Vol 209 (1-3) ◽  
pp. 155-165 ◽  
Author(s):  
S. Orlov ◽  
K. Regelskis ◽  
V. Smilgevičius ◽  
A. Stabinis
Keyword(s):  
Optical Vortices ◽  
Bessel Beams

scholarly journals Zeroth- and first-order long range non-diffracting Gauss–Bessel beams generated by annihilating multiple-charged optical vortices

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Lyubomir Stoyanov ◽  
Maya Zhekova ◽  
Aleksander Stefanov ◽  
Ivan Stefanov ◽  
Gerhard G. Paulus ◽  
...  
Keyword(s):  
Long Range ◽  
Spatial Light Modulator ◽  
Width Ratio ◽  
Optical Vortices ◽  
Large Radius ◽  
Light Modulator ◽  
Bessel Beams ◽  
First Order ◽  
Shaped Beam ◽  
Phase Profile

AbstractWe demonstrate an alternative approach for generating zeroth- and first-order long range non-diffracting Gauss–Bessel beams (GBBs). Starting from a Gaussian beam, the key point is the creation of a bright ring-shaped beam with a large radius-to-width ratio, which is subsequently Fourier-transformed by a thin lens. The phase profile required for creating zeroth-order GBBs is flat and helical for first-order GBBs with unit topological charge (TC). Both the ring-shaped beam and the required phase profile can be realized by creating highly charged optical vortices by a spatial light modulator and annihilating them by using a second modulator of the same type. The generated long-range GBBs are proven to have negligible transverse evolution up to 2 m and can be regarded as non-diffracting. The influences of the charge state of the TCs, the propagation distance behind the focusing lens, and the GBB profiles on the relative intensities of the peak/rings are discussed. The method is much more efficient as compared to this using annular slits in the back focal plane of lenses. Moreover, at large propagation distances the quality of the generated GBBs significantly surpasses this of GBBs created by low angle axicons. The developed analytical model reproduces the experimental data. The presented method is flexible, easily realizable by using a spatial light modulator, does not require any special optical elements and, thus, is accessible in many laboratories.

Generation of long range low-divergent Gauss–Bessel beams by annihilating optical vortices

2021 ◽  
Vol 480 ◽  
pp. 126510
Author(s):  
Lyubomir Stoyanov ◽  
Maya Zhekova ◽  
Aleksander Stefanov ◽  
Boris Ivanov ◽  
Ivan Stefanov ◽  
...  
Keyword(s):  
Long Range ◽  
Optical Vortices ◽  
Bessel Beams

scholarly journals Reexamination of Bessel beams: A generalized scheme to derive optical vortices

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
G. F. Quinteiro ◽  
C. T. Schmiegelow ◽  
D. E. Reiter ◽  
T. Kuhn
Keyword(s):  
Optical Vortices ◽  
Bessel Beams ◽  
Generalized Scheme

scholarly journals Trapping and acceleration of charged particles in Bessel beams

2006 ◽  
Vol 24 (4) ◽  
pp. 559-566 ◽  
Author(s):  
V. H. MELLADO ◽  
S. HACYAN ◽  
R. JÁUREGUI
Keyword(s):  
Electromagnetic Field ◽  
Transverse Electric ◽  
Bessel Beam ◽  
Charged Particles ◽  
Transverse Magnetic ◽  
Optical Vortices ◽  
Bessel Beams ◽  
Relativistic Charged Particle ◽  
Constants Of Motion ◽  
Dynamical Properties

We study the motion of a classical relativistic charged particle in the electromagnetic field of a Bessel beam exhibiting vector optical vortices, and show how its dynamical properties, such as linear and angular momentum, are transmitted to the particle. The effects of different polarizations are taken into account using transverse electric and magnetic modes, and their superpositions. The constants of motion are identified for the most general case. We report typical numerical results for axial and radial motion for various configurations, with an estimate of expected axial accelerations when transverse magnetic Bessel modes are used. The Lorentz transformation properties of the field are used throughout in order to simplify the calculations.

scholarly journals Multilevel axicon for perfect optical vortex generation

2019 ◽  
Vol 215 ◽  
pp. 02003
Author(s):  
Rebeca Tudor ◽  
Mihai Kusko ◽  
Cristian Kusko ◽  
Andrei Avram
Keyword(s):  
Visible Light ◽  
Optical Element ◽  
Optical Quality ◽  
Optical Vortices ◽  
Vortex Generation ◽  
Optical Fields ◽  
Order Zero ◽  
Bessel Beams ◽  
Optical Elements

We present the fabrication of a beam shaper with 32 levels for the generation of nondiffractive optical fields representing quasi-Bessel beams of order zero. This optical element is designed for visible light (λ=633 nm) and fabricated using standard photolithography and a fine calibrated reactive ion etching process. A large number of levels approximates a continuous conical surface so that the optical quality of the element is very good. It is investigated the possibility of generating perfect optical vortices with this class of optical elements.

scholarly journals Surface optical vortices

2009 ◽  
Vol 79 (1) ◽  
Author(s):  
V. E. Lembessis ◽  
M. Babiker ◽  
D. L. Andrews
Keyword(s):  
Optical Vortices ◽  
Surface Optical

Dark state atom mirrors based on artificial gauge fields created by surface optical vortices

2019 ◽  
Vol 36 (4) ◽  
pp. 971
Author(s):  
Vassilis E. Lembessis ◽  
Anwar Al Rsheed ◽  
Andreas Lyras ◽  
Omar M. Aldossary
Keyword(s):  
Gauge Fields ◽  
Optical Vortices ◽  
Dark State ◽  
Surface Optical ◽  
Artificial Gauge Fields

Flexographic ink-coating interactions: effects of latex variations in coating layers

TAPPI Journal ◽  
2016 ◽  
Vol 15 (4) ◽  
pp. 253-262 ◽  
Author(s):  
ERIK BOHLIN ◽  
CAISA JOHANNSON ◽  
MAGNUS LESTELIUS
Keyword(s):  
Contact Angles ◽  
High Ratio ◽  
Print Quality ◽  
Particle Sizes ◽  
Mixed Composition ◽  
Coating Surface ◽  
Covered Area ◽  
Surface Optical ◽  
Flexographic Printing ◽  
Coating Formulation

The effect of coating structure variations on flexographic print quality was studied using pilot-coated paperboard samples with different latex content and latex particle sizes. Two latexes, with particle sizes of 120 nm and 160 nm, were added at either 12 parts per hundred (pph) or 18 pph to the coating formulation. The samples were printed with full tone areas at print forces of 25 N and 50 N in a laboratory flexographic printing press using a waterbased ink. A high ratio of uncovered areas (UCAs) could be detected for the samples that contained 18 pph latex printed at a print force of 25 N. UCAs decreased with increased print force and with decreased amounts of latex in the coating formulation. The fraction of latex covered area on the coating surface was estimated to be 0.35–0.40 for the 12 pph, and 0.70–0.75 for the 18 pph samples. The ink penetration depth into the coating layer could be linked to the fraction of latex-free areas on the coating surface. Optical cross section microscopy indicated that a higher printing force did not increase the depth of penetrated ink to any greater extent. Higher printing force did increase contact between plate and substrate, leading to an improved distribution of the ink. This, in turn, increased print density and decreased UCAs. On closer inspection, the UCAs could be categorized as being induced by steep topographic changes. When appearing at other locations, they were more likely to be caused by poor wetting of the surface. To understand the wetting behavior of the coating surface, observed contact angles were compared with calculated contact angles on surfaces of mixed composition.

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