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Symmetry
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Advance in the Applied Optics with Symmetry/Asymmetry
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Advance in the Applied Optics with Symmetry/Asymmetry

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: closed (30 April 2023) | Viewed by 3681

Special Issue Editor

Dr. Renxian Li

E-Mail Website
Guest Editor
School of Physics, Xidian University, Xi’an 710071, China
Interests: vortex beam; light scattering; beam propagation; optical design; neural network
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

As an open access academic journal, Symmetry is peer-reviewed and internationally recognized, and ranked. The purpose of this Special Issue is to help spread findings and achievements in all fields of optics among academic peers.

Optics and photonics are two key technologies in the 21st century and have many novel applications in various fields. This Special Issue mainly publishes recent research contributions, projects, and applications in the optics domain and seeks outstanding original papers on the subject of symmetry and asymmetry. The potential themes include optical theory, light scattering, optical particle measurement, environmental monitoring, optical fiber optics, optical sensors, the interaction between materials and light, optical simulation, optical system design, statistical optics, medical optics, biological optics, optical imaging, etc.

We invite submissions to this Special Issue on topics related to the physical potential and challenges of future optical engineering and applications.

Dr. Renxian Li
Guest Editor

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. Symmetry 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

  • light scattering
  • machine learning
  • particle measurement
  • optical design
  • engineering optics
  • optical sensors
  • environmental monitoring
  • biophotonics
  • optical tweezers
  • optical imaging
  • symmetry/asymmetry application of optical design

Published Papers (3 papers)

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Research

16 pages, 6364 KiB  
Article
State-Aware High-Order Diffusion Method for Edge Detection in the Wavelet Domain
by Chenhua Liu and Anhong Wang
Symmetry 2023, 15(4), 803; https://doi.org/10.3390/sym15040803 - 25 Mar 2023
Viewed by 1043
Abstract
This paper addresses how to use high-order diffusion to restore the wavelet coefficients in the wavelet domain. To avoid image distortion, wavelets with symmetry are used for image decomposition to obtain the wavelet coefficients of each sub-band. Due to the influence of noise, [...] Read more.
This paper addresses how to use high-order diffusion to restore the wavelet coefficients in the wavelet domain. To avoid image distortion, wavelets with symmetry are used for image decomposition to obtain the wavelet coefficients of each sub-band. Due to the influence of noise, it is particularly important to obtain the wavelet coefficients, which can accurately reflect the image information. According to the characteristics of wavelet threshold shrinkage and the advantages of the high-order variational method in denoising, a wavelet coefficient restoration scheme is proposed. The theoretical basis of our proposed method is established through the analysis of wavelet threshold theory. To keep the original structure of wavelet coefficients unchanged, we introduce the concept of state quantity of wavelet coefficients and obtain the corresponding state quantity of wavelet coefficients using normalization. The denoising wavelet coefficient is obtained by performing a fourth-order anisotropic diffusion of the state quantities. This paper takes image edge feature extraction as the experimental content and image edges are detected by the module of the wavelet coefficients. The effectiveness of the proposed algorithm is objectively verified from three aspects: denoising effect, edge continuity, and accuracy. The experimental results show that the proposed algorithm can obtain continuous and precise image edges. The algorithm presented in this paper also applies to texture images. Compared with other algorithms, the edges image obtained by this scheme shows advantages in terms of noise removal and edge protection. Full article
(This article belongs to the Special Issue Advance in the Applied Optics with Symmetry/Asymmetry)
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24 pages, 12169 KiB  
Article
Symmetries of Scan Patterns of Laser Scanners with Rotational Risley Prisms
by Alexandru-Lucian Dimb and Virgil-Florin Duma
Symmetry 2023, 15(2), 336; https://doi.org/10.3390/sym15020336 - 25 Jan 2023
Cited by 6 | Viewed by 1240
Abstract
Laser scanners with rotational Risley prisms produce scan patterns that can be classified as a type of rhodonea curve, because of their symmetry. The present study builds upon the novel, graphical method that we have developed to simulate and analyze such patterns using [...] Read more.
Laser scanners with rotational Risley prisms produce scan patterns that can be classified as a type of rhodonea curve, because of their symmetry. The present study builds upon the novel, graphical method that we have developed to simulate and analyze such patterns using a commercially available mechanical design program, CATIA V5R20 (Dassault Systems, Paris, France). This graphical method has both the advantage of simplicity (regarding analytical methods) and of generating exact scan patterns (in contrast to approximate methods). The aim of this work is to utilize this method to study symmetry properties of scan patterns produced by a pair of rotational Risley prisms. A multi-parameter analysis is performed, considering the characteristic parameters of the approached scanner: refractive indexes and angles of the prisms, as well as their rotational velocities. Furthermore, Marshall’s parameters are considered: ratios of the rotational velocities and of the prism angles. Because the symmetries are identical for scan patterns generated by all the four possible configurations of a pair of prisms (and only their dimensions are different), the shape of these patterns is studied only for one of these configurations. Therefore, without losing generality, the symmetries of the patterns produced by such scanners are determined, as well as some of their characteristic dimensions. Rules-of-thumb were obtained to be able to generate patterns that are appropriate for a specific application. Moreover, we demonstrated that the existing symmetries simplify the process of obtaining the scan patterns by identifying repetitive parts (defined as structures of symmetry) of a pattern. Full article
(This article belongs to the Special Issue Advance in the Applied Optics with Symmetry/Asymmetry)
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15 pages, 9672 KiB  
Article
Optical Torque Exerted on a Charged Sphere by a Polarized Bessel Beam
by Ping Li, Lingyu Wan, Huilu Yao, Devki N. Talwar, Liuyan Li and Jiang Jiang
Symmetry 2023, 15(1), 128; https://doi.org/10.3390/sym15010128 - 02 Jan 2023
Viewed by 1047
Abstract
In the framework of generalized Lorenz–Mie theory, we report here the results of our comprehensive study for analyzing and computing the optical torque (OT) caused by AGVBB on a charged sphere of arbitrary size. The effects of polarization, order, half-cone angle, the position [...] Read more.
In the framework of generalized Lorenz–Mie theory, we report here the results of our comprehensive study for analyzing and computing the optical torque (OT) caused by AGVBB on a charged sphere of arbitrary size. The effects of polarization, order, half-cone angle, the position of particle, and the surface charge are carefully considered. The axial and transverse components or OTs are numerically calculated, and the sign reversal of the axial OTs and vortex-like character of the total transverse OTs are mainly discussed. The results reported here are expected to have significant impact on improving the ability of optical manipulation and rotation. Full article
(This article belongs to the Special Issue Advance in the Applied Optics with Symmetry/Asymmetry)
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