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Photonics
Special Issues
Correlation Optics
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Correlation Optics

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

Deadline for manuscript submissions: closed (20 December 2023) | Viewed by 4324

Special Issue Editors

Dr. Vinu R.V

E-Mail Website
Guest Editor
College of Information Science and Engineering, Huaqiao University, Quanzhou, China
Interests: digital holography; quantitative phase microscopy; correlation optics; ghost imaging; polarimetry
Dr. Gopakumar G.

E-Mail Website
Guest Editor
Department of Computer Science and Engineering, School of Computing, Amrita Vishwa Vidyapeetham - Amritapuri Campus, Coimbatore, India
Interests: deep learning; computer vision; microscopy image processing

Special Issue Information

Dear Colleagues,

Correlation optics has evolved into an exceptionally fascinating and promising domain in modern optics and photonics with diverse technological developments ranging from imaging to communication, from astronomy to industrial metrology, etc. In correlation assisted optical techniques, the light fields were visualized in terms of correlation functions, which correlates the statistical parameters of a field scattered by an object with the statistical characteristics of the object. The last two decades witnessed a tremendous advancement of the state-of-the art theoretical and experimental techniques in correlation optics with research and applied interest alongside the rapid technological progress in the diffractive optical elements, high-speed detection devices, and computational optical and machine learning methods.

This Special Issue aims to highlight the latest developments in correlation-assisted techniques, including novel theoretical aspects, device design and interesting practical applications that can impact the area of optics and photonics.

This Special Issue invites manuscripts that introduce the recent advances in correlation optics and related technologies. For this Special Issue, theoretical, numerical, and experimental papers will be accepted. Topics include, but are not limited to, the following:

  • Coherence and polarization;
  • Holography;
  • Microscopy;
  • Speckles;
  • Imaging through scattering media;
  • Ghost diffraction and imaging;
  • Intensity interferometry;
  • Metrology;
  • Structured light;
  • Singular optics;
  • Diffractive optics;
  • Optical communications;
  • Computational optics;
  • Compressive sensing;
  • Deep learning.

Dr. Vinu R.V
Dr. Gopakumar G.
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • correlation
  • speckles
  • coherence
  • polarization
  • scattering media
  • deep learning

Published Papers (3 papers)

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Research

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12 pages, 4597 KiB  
Article
Optical Helicity of Light in the Tight Focus
by Alexey A. Kovalev, Victor V. Kotlyar and Alexey M. Telegin
Photonics 2023, 10(7), 719; https://doi.org/10.3390/photonics10070719 - 23 Jun 2023
Cited by 2 | Viewed by 937
Abstract
Using the Richards–Wolf formalism, we obtain explicit analytical expressions for the optical helicity density at the tight focus of four different light beams: a linearly polarized optical vortex, an optical vortex with right-handed circular polarization, superposition of a cylindrical vector beam and a [...] Read more.
Using the Richards–Wolf formalism, we obtain explicit analytical expressions for the optical helicity density at the tight focus of four different light beams: a linearly polarized optical vortex, an optical vortex with right-handed circular polarization, superposition of a cylindrical vector beam and a linearly polarized beam, and a beam with hybrid circular-azimuthal polarization. We show that, in all four cases, the helicity density at the focus is nonzero and has different signs in different focal plane areas. If the helicity density changes sign, then the full helicity of the beam (averaged over the beam cross section at the focus) is zero and is conserved upon propagation. We reveal that the full helicity is zero when the full longitudinal component of the spin angular momentum is zero. If the helicity density does not change sign at the focus, such as in a circularly polarized optical vortex, then it is equal to the intensity in the focus, with the full helicity being equal to the beam power and conserving upon propagation. Although the helicity is related to the polarization state distribution across the beam at the focus, the expressions for the helicity density are found to be different from those for the longitudinal component of the spin angular momentum for the beams of interest. Full article
(This article belongs to the Special Issue Correlation Optics)
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8 pages, 3100 KiB  
Communication
Multi-Level Logarithmic Amplification-Based Fixed Threshold Circular Polarized On-Off Keying Detection for Free-Space Optical Communications
by Pei-Zheng Yu, Qian-Wen Jing and Yan-Qing Hong
Photonics 2023, 10(6), 667; https://doi.org/10.3390/photonics10060667 - 8 Jun 2023
Viewed by 883
Abstract
This study investigates a multi-level logarithmic amplification (MLA)-based fixed threshold circular polarized on-off keying (CP-OOK) detection for free-space optical (FSO) communication links. OOK signal is polarized into a single circular polarization state by a linear polarizer (LP) and a quarter-wave plate (QWP). In [...] Read more.
This study investigates a multi-level logarithmic amplification (MLA)-based fixed threshold circular polarized on-off keying (CP-OOK) detection for free-space optical (FSO) communication links. OOK signal is polarized into a single circular polarization state by a linear polarizer (LP) and a quarter-wave plate (QWP). In the receiver terminal, firstly, circular polarization is transformed into linear polarization utilizing QWP without polarization coordinates alignment between transmitter and receiver. Then, the background noises are decreased by polarization filtering using LP. Then, CP-OOK signal intensity variation is eliminated by nonlinear gains from MLAs in the low gain nonlinearity condition. Finally, fixed threshold decision (FTD) is realized by optimizing cascaded LAs to reduce the extinction ratio distortion of the CP-OOK signal. The proposed CP-OOK transmission is analyzed under various strengths of turbulence channel and different configurations of MLAs. Simulation results demonstrated that the proposed CP-OOK signal was effectively detected by FTD with optimized MLAs. Full article
(This article belongs to the Special Issue Correlation Optics)
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Other

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18 pages, 10421 KiB  
Tutorial
Single-Shot 3D Incoherent Imaging Using Deterministic and Random Optical Fields with Lucy–Richardson–Rosen Algorithm
by Agnes Pristy Ignatius Xavier, Francis Gracy Arockiaraj, Shivasubramanian Gopinath, Aravind Simon John Francis Rajeswary, Andra Naresh Kumar Reddy, Rashid A. Ganeev, M. Scott Arockia Singh, S. D. Milling Tania and Vijayakumar Anand
Photonics 2023, 10(9), 987; https://doi.org/10.3390/photonics10090987 - 30 Aug 2023
Cited by 9 | Viewed by 1841
Abstract
Coded aperture 3D imaging techniques have been rapidly evolving in recent years. The two main directions of evolution are in aperture engineering to generate the optimal optical field and in the development of a computational reconstruction method to reconstruct the object’s image from [...] Read more.
Coded aperture 3D imaging techniques have been rapidly evolving in recent years. The two main directions of evolution are in aperture engineering to generate the optimal optical field and in the development of a computational reconstruction method to reconstruct the object’s image from the intensity distribution with minimal noise. The goal is to find the ideal aperture–reconstruction method pair, and if not that, to optimize one to match the other for designing an imaging system with the required 3D imaging characteristics. The Lucy–Richardson–Rosen algorithm (LR2A), a recently developed computational reconstruction method, was found to perform better than its predecessors, such as matched filter, inverse filter, phase-only filter, Lucy–Richardson algorithm, and non-linear reconstruction (NLR), for certain apertures when the point spread function (PSF) is a real and symmetric function. For other cases of PSF, NLR performed better than the rest of the methods. In this tutorial, LR2A has been presented as a generalized approach for any optical field when the PSF is known along with MATLAB codes for reconstruction. The common problems and pitfalls in using LR2A have been discussed. Simulation and experimental studies for common optical fields such as spherical, Bessel, vortex beams, and exotic optical fields such as Airy, scattered, and self-rotating beams have been presented. From this study, it can be seen that it is possible to transfer the 3D imaging characteristics from non-imaging-type exotic fields to indirect imaging systems faithfully using LR2A. The application of LR2A to medical images such as colonoscopy images and cone beam computed tomography images with synthetic PSF has been demonstrated. We believe that the tutorial will provide a deeper understanding of computational reconstruction using LR2A. Full article
(This article belongs to the Special Issue Correlation Optics)
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