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Crystals
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Photoelasticity in Optical Media from Crystals to Amorphous Materials
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Photoelasticity in Optical Media from Crystals to Amorphous Materials

A special issue of Crystals (ISSN 2073-4352).

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 4769

Special Issue Editors

Prof. Dr. Daniele Rinaldi

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Guest Editor
Dipartimento di Fisica e Ingegneria dei Materiali e del Territorio, Università Politecnica delle Marche, 60121 Ancona AN, Italy
Interests: crystals; photoelasticity; nanomaterials; scintillators; quality control
Special Issues, Collections and Topics in MDPI journals
Dr. Luigi Montalto

E-Mail Website
Guest Editor
Department of Industrial Engineering and Mathematical Sciences, Università Politecnica delle Marche, Ancona, Italy
Interests: instrumentation; quality control; non invasive measurement techniques; experimental measurements; optical methods for crystals

Special Issue Information

Photoelasticity is a discipline allowing the analysis of crystal and general transparent media which was developed from crystallography and elasto-optic sciences. Its strength is due to the capability of photoelastic techniques to perform noninvasive analysis, aiming to conduct a qualitative and quantitative assessment of crystals and transparent media conditions. Photoelasticity directly measures the internal structural condition and stress state of the transparent media. Accordingly, photoelasticity is a powerful tool for quality control in a fast non-destructive way.

Pioneering studies have been dedicated to isotropic materials, like glasses and plastic, and have been applied for stress distribution detection in mechanical structures or to prevent breaking in stressed transparent samples. Currently, the theoretic advances on elasto-optics and photoelasticity allow to study the stress state and defectiveness in anisotropic crystals. The present Special Issue aims to report on the progress made in photoelasticity, improving the theory, crystals knowledge, structural condition and defectiveness measurement models and systems; as well as enabling to study the relation between the crystal state and optic properties. In fact, photoelasticity is a fundamental tool, not only in mechanics, but also in disciplines like photonics and scintillating materials since the structural state indeed affects the optical properties of each material.

Recently, a number of optical materials for several applications have different structures from pure crystalline to polycrystalline and amorphous structures with a certain degree of crystallinity. Since photoelasticity is a universal technique covering all these structures, this Special Issue extends beyond the pure crystalline structures to glasses-like materials. The need for local assessment and taking into account that requirements for photoelastic media dimensions can go to the millimetric scale, therefore contributions exploring new techniques with a large range of resolution down to the micrometric are welcome. This will also pave the way for the design of a new kind of polariscopes. Photelasticity is consequently very relevant for the quality control and investigation of transparent media from both a theoretical and technological point of view. Accordingly, the present Special Issue welcomes papers that represent an effort to develop the theory, the methodology and the application fields of photoelasticity. Original papers, communications and reviews are encouraged to be submitted to the Special Issue, with a particular focus not only on the photoelastic theory, but also on transparent media studies and characterization, innovative applications and photoelastic techniques.

Prof. Dr. Daniele Rinaldi
Dr. Luigi Montalto
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. Crystals 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 2600 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

  • photoelasticity
  • transparent media
  • internal stress
  • crystal defects
  • quality control
  • scintillators
  • photonics
  • polariscope
  • conoscopy

Published Papers (2 papers)

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Research

12 pages, 596 KiB  
Article
The Refraction Indices and Brewster Law in Stressed Isotropic Materials and Cubic Crystals
by Daniele Rinaldi, Pier Paolo Natali, Luigi Montalto and Fabrizio Davì
Crystals 2021, 11(9), 1104; https://doi.org/10.3390/cryst11091104 - 10 Sep 2021
Cited by 1 | Viewed by 1728
Abstract
We study the elasto-optic behavior of stressed cubic crystals (all classes) and isotropic materials (like e.g., glasses). We obtain the explicit dependence of the refraction indices on the stress (either applied or residual), as well as a mild generalization of the Brewster law [...] Read more.
We study the elasto-optic behavior of stressed cubic crystals (all classes) and isotropic materials (like e.g., glasses). We obtain the explicit dependence of the refraction indices on the stress (either applied or residual), as well as a mild generalization of the Brewster law for cubic crystals. We show also that the optic indicatrix and the stress ellipsoid are coaxial only in the isotropic case. This theory allows the improvement of the measurement techniques, as photoelasticity, on cubic crystals and optically isotropic materials. Full article
(This article belongs to the Special Issue Photoelasticity in Optical Media from Crystals to Amorphous Materials)
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14 pages, 921 KiB  
Article
Photoelastic Properties of Trigonal Crystals
by Bohdan Mytsyk, Nataliya Demyanyshyn, Anatoliy Andrushchak and Oleh Buryy
Crystals 2021, 11(9), 1095; https://doi.org/10.3390/cryst11091095 - 08 Sep 2021
Cited by 5 | Viewed by 2340
Abstract
All possible experimental geometries of the piezo-optic effect in crystals of trigonal symmetry are studied in detail through the interferometric technique, and the corresponding expressions for the calculation of piezo-optic coefficients (POCs) πim and some sums of πim based on experimental [...] Read more.
All possible experimental geometries of the piezo-optic effect in crystals of trigonal symmetry are studied in detail through the interferometric technique, and the corresponding expressions for the calculation of piezo-optic coefficients (POCs) πim and some sums of πim based on experimental data obtained from the samples of direct and X/45°-cuts are given. The reliability of the values of POCs is proven by the convergence of πim obtained from different experimental geometries as well as by the convergence of some sums of POCs. Because both the signs and the absolute values of POCs π14 and π41 are defined by the choice of the right crystal-physics coordinate system, we here use the system whereby the condition S14 > 0 is fulfilled (S14 is an elastic compliance coefficient). The absolute value and the sign of S14 are determined by piezo-optic interferometric method from two experimental geometries. The errors of POCs are calculated as mean square values of the errors of the half-wave stresses and the elastic term. All components of the matrix of elasto-optic coefficients pin are calculated based on POCs and elastic stiffness coefficients. The technique is tested on LiTaO3 crystal. The obtained results are compared with the corresponding data for trigonal LiNbO3 and Ca3TaGa3Si2O14 crystals. Full article
(This article belongs to the Special Issue Photoelasticity in Optical Media from Crystals to Amorphous Materials)
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