Advances in Structured Light Generation and Manipulation

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: closed (31 May 2024) | Viewed by 2826

Special Issue Editors


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Guest Editor
V.I. Vernadsky Crimean Federal University, Vernadsky Prospect 4, Simferopol 295007, Russia
Interests: laser physics; optical vortices and orbital angular momentum of light; optical fiber and polarization optics

E-Mail Website
Guest Editor
V.I. Vernadsky Crimean Federal University, Vernadsky Prospect 4, Simferopol 295007, Russia
Interests: optical vortices; spectrum of orbital angular momentum of light; vision-based measurement; computing optical imaging

E-Mail Website
Guest Editor
V.I. Vernadsky Crimean Federal University, Vernadsky Prospect 4, Simferopol 295007, Russia
Interests: optical vortices; optical measurement; computing optical imaging

Special Issue Information

Dear Colleagues,

Structured vortex light, capable of carrying a great number of degrees of freedom, finds manifold applications from the software of standard computers to quantum devices in optical communications and laser material processing systems employing both scalar and vector unique properties of light. In order to ensure the real embodiment of the structured light properties in systems and devices of modern photonics, it is required to cover a huge layer of theoretical, experimental, technical, and technological research. Over the past three decades, significant fundamental studies in vortex beam optics have been carried out, presenting new beam types and their transformation in uniform media and resistance to destruction in turbulent environments. Particular attention was paid to the technique of shaping scalar and vector structured beams by spatial light modulators, as well as metasurfaces, both for classical and quantum information processing systems.

A lot of physical and technical problems have arisen and been solved in the course of these studies, but many of them are still looking for solutions. The purpose of this Special Issue is to highlight important unresolved problems and original and unexpected approaches to solving some of them.

This Special Issue encompasses state-of-the-art articles on both theoretical and experimental studies on structured vortex beams, generation, multiplexing, and demultiplexing techniques, propagation, focusing, and measurement in uniform and turbulent media, as well as the latest applications of the structured beams. The main topics of interest of this Special Issue are included in the following sections:

Singular Optics

Fundamentals of singular optics; principles of quantum singular optics; propagation of singular beams in free space, crystals, optical fibers; optics of polarization singularities; spin–orbit interaction in laser beams; vortex–division multiplexing systems in a communication medium; optical vortices in turbulent environments; singular near-field optics; and sensors of physical quantities based on optical vortices.

Diffraction and Gratings

Vortex beams diffraction. Digital singular optics; nanophotonics and optics of nanostructures; digital signals and images processing; optical communication based on singular beams; microscopy and adaptive optics of singular beams; and biomedical and industrial applications.

Information Optics and Quantum Technologies

Mathematical techniques in the pattern recognition theory; optical techniques for obtaining and processing images; information processing based on optical vortices; geographic information technologies; information encryption, decryption, and protection, including quantum cryptography; methods of digital singular optics; hyper-spectral data analysis; numerical methods of computer optics; information technology and nanotechnology.

Coherent Optics and Photonics

Theoretical approaches of optical holography and analysis of the properties of holograms; digital image processing; new methods of holographic and speckle interferometry; speckle correlation methods; visual holography (physical and digital methods); holographic technologies in biology and medicine; application of coherent–optical methods in the diagnosis of deformations, damages and residual life; hologram optical elements; photo materials; media for hologram registration; security hologram technology; holography and education; Luminescent materials and technologies; photonics of advanced materials; spectroscopy of quantum dots and single molecules; optical properties of metamaterials.

Photonics and Laser Spectroscopy

Coherent processes of the interaction of optical radiation with matter and optical materials. Problems of theoretical and experimental laser spectroscopy of atoms, molecules, and condensed matter. Non-linear optics and laser physics. Photonics of molecular nanoclusters. Physics of lasers and laser technologies. Optics and photonics in biology and medicine.

Prof. Dr. Volyar Alexander
Dr. Bretsko Mikhail Vladimirovich
Dr. Akimova Yana Evgenievna
Guest Editors

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Keywords

  • structured light
  • tailored light
  • shaped light
  • structured illumination
  • orbital angular momentum
  • vortices
  • structured polarization

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Published Papers (2 papers)

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Research

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16 pages, 10520 KiB  
Article
Engineering Orbital Angular Momentum in Structured Beams in General Astigmatic Systems via Symplectic Matrix Approach
by Alexander Volyar, Eugeny Abramochkin, Mikhail Bretsko and Yana Akimova
Photonics 2024, 11(3), 191; https://doi.org/10.3390/photonics11030191 - 20 Feb 2024
Cited by 2 | Viewed by 1237
Abstract
We studied theoretically and experimentally the propagation of structured Laguerre–Gaussian (sLG) beams through an optical system with general astigmatism based on symplectic ABCD transforms involving geometry of the second-order intensity moments symplectic matrices. The evolution of the coordinate submatrix ellipses accompanying the transformation [...] Read more.
We studied theoretically and experimentally the propagation of structured Laguerre–Gaussian (sLG) beams through an optical system with general astigmatism based on symplectic ABCD transforms involving geometry of the second-order intensity moments symplectic matrices. The evolution of the coordinate submatrix ellipses accompanying the transformation of intensity patterns at different orientations of the cylindrical lens was studied. It was found that the coordinate submatrix W and the twistedness submatrix M of the symplectic matrix P degenerate in the astigmatic sLG beam with simple astigmatism, which sharply reduces the number of degrees of freedom, while general astigmatism removes the degeneracy. Nevertheless, degeneracy entails a simple relationship between the coordinate element Wxy and the twistedness elements Mxy and Myx of the submatrix M, which greatly simplifies the measurement of the total orbital angular momentum (OAM), reducing the full cycle of measurements of the Hermite–Gaussian (HG) mode spectrum (amplitudes and phases) of the structured beam to the only measurement of the intensity moment. Moreover, we have shown that Fourier transform by a spherical lens enables us to suppress the astigmatic OAM component and restore the original free-astigmatic sLG beam structure. However, with further propagation, the sLG beam restores its astigmatic structure while maintaining the maximum OAM. Full article
(This article belongs to the Special Issue Advances in Structured Light Generation and Manipulation)
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Review

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16 pages, 3641 KiB  
Review
Features of Adaptive Phase Correction of Optical Wave Distortions under Conditions of Intensity Fluctuations
by Vladimir Lukin
Photonics 2024, 11(5), 460; https://doi.org/10.3390/photonics11050460 - 14 May 2024
Cited by 1 | Viewed by 1170
Abstract
An analysis of the features of measurements and correction of phase distortions in optical waves propagating in the atmosphere at various levels of turbulence was performed. It is shown that with increasing intensity fluctuations, the limiting capabilities of phase correction decrease, and the [...] Read more.
An analysis of the features of measurements and correction of phase distortions in optical waves propagating in the atmosphere at various levels of turbulence was performed. It is shown that with increasing intensity fluctuations, the limiting capabilities of phase correction decrease, and the phase of an optical wave that has passed through a turbulence layer consists of two components: potential and vortex. It was found that even in the region of weak fluctuations there is an overlap of spectral filtering functions for intensity and phase fluctuations. Areas of turbulence inhomogeneities have been identified that will have mutual influence and negatively affect the operation of the phase meter. It is noted that correlation functions, both phase and intensity, are less susceptible to this compared to structural functions. The results of experimental studies on the reconstruction of the wavefront of laser radiation distorted by atmospheric turbulence using a Shack–Hartmann wavefront sensor during vignetting and central screening of the entrance pupil in the optical system are presented. Studies have been carried out on the propagation of laser radiation along a horizontal atmospheric path for various levels of turbulence. The results are analyzed in terms of Zernike polynomials. Full article
(This article belongs to the Special Issue Advances in Structured Light Generation and Manipulation)
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