Interferometric method for birefringence determination with a polarizing microscope

Dumitrascu, Leonas; Dumitrascu, Irina; Dorohoi, Dana Ortansa; Toma, M.

doi:10.1364/oe.16.020884

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…Another method for determination of birefringence for an anisotropic material is the use of a polarizing microscope, whose main components are depicted in Figure 7 a [ 38 ]. When an AL, having h as thickness, is introduced between the polarizing filters ( A and P ), it creates a phase difference between the two components of the electric field vector.…”

Section: Optical Methods For Linear Birefringence Evaluationmentioning

confidence: 99%

Review on Optical Methods Used to Characterize the Linear Birefringence of Polymer Materials for Various Applications

et al. 2023

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Optical polymers are recognized for their high transparency, raised flexibility, low cost, and good film-forming ability; hence, they introduce a multitude of benefits in a wide range of devices, such as information storage, displays, optical communications, and filters. Among the optical properties, birefringence is an essential parameter in practical cases that demand the control of the state of polarization of light. This review is focused on describing some fundamental and applicative aspects concerning the optical birefringence of the polymer materials. First, elementary notions depicting the phenomenon of light double refraction in macromolecular media are provided. Furthermore, the most relevant optical techniques to determine birefringence are reviewed by highlighting the working principle and mathematical basis for computing this parameter. Then, a series of investigations of optically birefringent polymers are described, summarizing the most utilized approaches to induce light double refraction in such materials. The selected results are analyzed in relation to the pursued applications. In the end, the future of this scientific domain is briefly presented by establishing the research paths that need further exploration. Moreover, the novel directions that could be formulated and might contribute to certain considerable advancements in the materials employed in the modern optical technologies are mentioned.

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Section: Optical Methods For Linear Birefringence Evaluationmentioning

confidence: 99%

Review on Optical Methods Used to Characterize the Linear Birefringence of Polymer Materials for Various Applications

et al. 2023

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“…Natural and induced (by external fields of forces) anisotropy is very important in determining the direction and intensity of the tensions in materials functioning in field of forces (planes, submarines) or in obtaining total polarized radiations [3]. Linear birefringence measurement is one of the standard techniques used to study the optical properties of anisotropic materials, and interferometric methods used for this purpose are regarded as some of the most accurate methods due to their very high sensitivity.…”

Section: -1mentioning

confidence: 99%

Methods for determining the linear birefringence of some inorganic uniax crystals

Tudose¹,

Dumitrascu²,

Dumitrascu³

et al. 2017

AIP Conference Proceedings

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Abstract.Anisotropy is an important property of the transparent ordered solids such as crystals, liquid crystals or polymer foils consisting in the dependence of their physical parameters on the propagation direction and light polarization state. The most common birefringent materials are the crystals (including here the liquid crystals) with asymmetric structures and the plastics under mechanical stress. For uniax materials there is a single direction governing the optical anisotropy (called as optical axis), whereas all directions perpendicular to it are optically equivalent. The uniax materials are characterized by two values of the refractive index. The ordinary value (n o ) is measured with linearly polarized radiations acting perpendicular on the principal section, while the extraordinary value (n e ) corresponds to linearly polarized radiations with their electric field intensity contained in this section [1]. Some results obtained by different methods in estimating the main refractive indices and birefringence of some uniax anisotropy layers are given and a comparative study of the accuracy of the applied methods is discussed in this paper.

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“…The last two materials have the advantage that their birefringence can be modified by external field of forces [1,2]. There are some methods for determining both linear [3][4][5][6][7][8] and circular [9][10][11][12][13] birefringence of the anisotropic layers, based on the compensation of the optical path length [3][4][5][6][7][8][9][10][11][12][13][14][15] or interferometric means [3,8,10]. For thick anisotropic layers the method based on channeled spectra [3,10,12] is usually applied.…”

Section: Introductionmentioning

confidence: 99%

“…This method is very precise and allows measurements for all components of light in a single experiment. The birefringence can be determined by using compensators (e.g., Babinet compensator used in our laboratory [4][5][6][7][8]14,15]), but the experiment asks for monochromatic radiations for which the compensatory device must be standardized.…”

Section: Introductionmentioning

confidence: 99%

Birefringence of Thin Uniaxial Polymer Films Estimated Using the Light Polarization Ellipse

et al. 2022

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A simple method for determining the linear birefringence of the thin layers based on the determination of the orientation of the polarization ellipse of totally polarized light is proposed and it is applied to PVA thin foils. Theoretical notions and the experimental procedure are described. The linear birefringence of polymer thin foils with different degrees of stretching is determined and the applicability of the method is discussed.

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Interferometric method for birefringence determination with a polarizing microscope

Cited by 7 publications

References 8 publications

Review on Optical Methods Used to Characterize the Linear Birefringence of Polymer Materials for Various Applications

Review on Optical Methods Used to Characterize the Linear Birefringence of Polymer Materials for Various Applications

Methods for determining the linear birefringence of some inorganic uniax crystals

Birefringence of Thin Uniaxial Polymer Films Estimated Using the Light Polarization Ellipse

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