Study of internal energy flows in dipole vortex beams by knife edge test

Singh, Brijesh Kumar; Bahl, Monika; Mehta, Dalip Singh; Senthilkumaran, P.

doi:10.1016/j.optcom.2012.11.085

Cited by 19 publications

(5 citation statements)

References 25 publications

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“…We numerically calculated and experimentally obtained the intensity patterns of the modified BG vortex beam in the far field with various phase terms using Equation ( 3 I(x, y) and ⃗ ∇𝜃(x, y) are the intensity and the transverse phase gradient, respectively. [55] The energy flows also transformed into spiral forms as m ′ is increased, and the distributions of the flows are consistent with the intensity patterns. In Figure 3a1-a5, the density of distribution and the size of the arrows represent the intensity of the focused beam.…”

Section: Simulation and Experimentssupporting

confidence: 66%

Modified Bessel–Gaussian Vortex Beam with an Adjustable Broken Opening

Yang

Zhang

et al. 2021

Annalen der Physik

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In this study, an open-ring controllable Bessel vortex beam is theoretically and experimentally constructed with a power-exponent-phase vortex. Its distribution in the far field after being blocked with obstacles is subsequently investigated. In the far field, the beam exhibits different degrees of the open-loop effect following adjustments in the phase term of the power exponent. For an obstructed beam, the direction of the open loop is offset by a certain value, and different open-loop angles can be achieved for different blocking angles. The developed beam can be used to guide particles and avoid obstacles.

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Section: Simulation and Experimentssupporting

confidence: 66%

Modified Bessel–Gaussian Vortex Beam with an Adjustable Broken Opening

Yang

Zhang

et al. 2021

Annalen der Physik

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“…An analogy between azimuthons (found in nonlinear media) and rotating transverse energy flow structures in paraxial beams is demonstrated in [241]. Patterns of energy flows in dipole vortex beams were studied using a knife-edge test [242]. Effect of astigmatism [243] and coma [244] on the transverse energy distributions was also investigated.…”

Section: Literature Survey Of Phase and Polarization Singularitiesmentioning

confidence: 99%

Phase Singularities to Polarization Singularities

Ruchi

Senthilkumaran

Pal

2020

International Journal of Optics

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Polarization singularities are superpositions of orbital angular momentum (OAM) states in orthogonal circular polarization basis. The intrinsic OAM of light beams arises due to the helical wavefronts of phase singularities. In phase singularities, circulating phase gradients and, in polarization singularities, circulating ϕ12 Stokes phase gradients are present. At the phase and polarization singularities, undefined quantities are the phase and ϕ12 Stokes phase, respectively. Conversion of circulating phase gradient into circulating Stokes phase gradient reveals the connection between phase (scalar) and polarization (vector) singularities. We demonstrate this by theoretically and experimentally generating polarization singularities using phase singularities. Furthermore, the relation between scalar fields and Stokes fields and the singularities in each of them is discussed. This paper is written as a tutorial-cum-review-type article keeping in mind the beginners and researchers in other areas, yet many of the concepts are given novel explanations by adopting different approaches from the available literature on this subject.

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“…For positive TCs, the intensity and phase gradients have opposite directions, whereas for negative TCs, the directions are the same. [ 55 ] The energy flows are computed as transverse components of the Poynting vector as follows: [ 56 ]

\begin{eqnarray} \left\langle {\vec{J}} \right\rangle &=& \frac{c}{{4\pi \varepsilon }}\left\langle {\vec{D} \times \vec{B}} \right\rangle\nonumber\\ &=& \frac{c}{{8\pi \varepsilon }}\left( {i\omega \left( {E{\nabla }_ \bot {E}^* - {E}^*{\nabla }_ \bot E} \right) + 2\omega k{{\left| E \right|}}^2{{\vec{e}}}_z} \right) \end{eqnarray}

where c denotes the speed of light in vacuum, ε is the permittivity,

\vec{D}

and

\vec{B}

represent the electric and magnetic fields, respectively,

{\nabla }_ \bot = {\vec{e}}_x\frac{\partial }{{\partial x}} + {\vec{e}}_y\frac{\partial }{{\partial y}}

is used to calculate the transverse gradient of E , and

{E}^ *

denotes the complex conjugate beam of E . The energy flow of the HO‐OVL was numerically simulated using Equation (10).…”

Section: Resultsmentioning

confidence: 99%

“…For positive TCs, the intensity and phase gradients have opposite directions, whereas for negative TCs, the directions are the same. [55] The energy flows are computed as transverse components of the Poynting vector as follows: [56] ⟨…”

Section: Resultsmentioning

confidence: 99%

Generation and Talbot Effect of Optical Vortex Lattices with High Orbital Angular Momenta

Luo,

Sang,

Xiao

et al. 2023

Adv Quantum Tech

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Optical vortex lattices (OVLs) are gaining increased research attention owing to their unique features related to intensity and phase structure. Interference is a common method for generating an OVL. However, the topological charge (TC) of a single building block in an OVL is fixed and cannot be modulated, thereby limiting its applicability. This study entailed the use of phase multiplication to generate a high‐order OVL to facilitate the arbitrary modulation of its TC. The generated high‐order OVL exhibited the Talbot effect during transmission, and it transformed into a super‐honeycomb lattice at specific fractional Talbot lengths. In addition, an orbital angular momentum developed in the OVL; this has broad application prospects in optical micromanipulation. Further, a method for generating super‐honeycomb lattices is devised. The findings of this study enhances understanding of the Talbot effect and broaden the practical applicability of OVLs.

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Study of internal energy flows in dipole vortex beams by knife edge test

Cited by 19 publications

References 25 publications

Modified Bessel–Gaussian Vortex Beam with an Adjustable Broken Opening

Modified Bessel–Gaussian Vortex Beam with an Adjustable Broken Opening

Phase Singularities to Polarization Singularities

Generation and Talbot Effect of Optical Vortex Lattices with High Orbital Angular Momenta

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