scholarly journals Optical anisotropy measurement in normal and cancerous tissues: backscattering technique

2020 ◽  
Vol 11 (6) ◽  
pp. 2996
Author(s):  
Mohammad Soltaninezhad ◽  
Ali Bavali ◽  
Ziba Nazifinia ◽  
Vahid Soleimani
Keyword(s):  
Optical Anisotropy ◽  
Anisotropy Measurement

Scattering Rings in Birefringent Porous Silicon

2003 ◽  
Vol 762 ◽  
Author(s):  
Claudio J. Oton ◽  
Zeno Gaburro ◽  
Mher Ghulinyan ◽  
Nicola Daldosso ◽  
Lucio Pancheri ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Light Scattering ◽  
Porous Silicon ◽  
Direct Measurement ◽  
Optical Anisotropy ◽  
Oblique Incidence ◽  
Laser Light ◽  
Anisotropic Scattering ◽  
Scattering Measurements

AbstractWe report the observation of strongly anisotropic scattering of laser light at oblique incidence on (100)-oriented porous silicon layers. We performed angle-resolved light scattering measurements and three concentric rings were observed. Modeling porous silicon by means of nanometric columnar air pores and an effective anisotropic uniaxial dielectric constant explains the observed phenomenon, and besides, the observation of the angle aperture of these rings allows a direct measurement of relative birefringence. We finally study the changes of optical anisotropy after different modifications of the structure.

Effects of Giant Optical Anisotropy in R-plane GaN/AlGaN Quantum Wells by Valence Band Mixing

PIERS Online ◽  
2006 ◽  
Vol 2 (6) ◽  
pp. 562-566 ◽  
Author(s):  
Chun-Nan Chen ◽  
Kao-Feng Yarn ◽  
Win Jet Luo ◽  
Jih-Chen Chiang ◽  
Ikai Lo ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Valence Band ◽  
Optical Anisotropy ◽  
Band Mixing ◽  
Valence Band Mixing

RESULTS OF POLARIZED LIGHT USE FOR STUDY OF STRESS-STRAIN STATE OF CORNEA IN PATHOLOGY OF EXTRAOCULAR MUSCLES

2020 ◽  
pp. 65-69
Author(s):  
Nataliia Mykhailivna Kovtun ◽  
Ihor Volodymyrovych Kaplin
Keyword(s):  
Interference Pattern ◽  
Optical Anisotropy ◽  
Extraocular Muscle ◽  
Strain State ◽  
Polarized Light ◽  
Attachment Site ◽  
Rectus Muscle ◽  
Extraocular Muscles ◽  
Asymmetric Distortion ◽  
Interference Picture

The parameters of interference patterns observed on the cornea in a polarized light in pathology of extraocular muscles were quantitatively evaluated. A study of the shape of 147 interference patterns observed on the cornea in a polarized light showed that the horizontal deviation of an eye in 56 % of cases was caused by the displacement of the attachment of the upper rectus muscle towards the inner rectus muscle. During illumination of the cornea of a live eye with polarized light, a specific interference pattern in the form of a rhombus formed by rainbow stripes (isochromes) is observed. It is established that such an interference pattern is the result of the influence of extraocular muscles on the cornea. The findings showed that the weakening of the force of one of muscles leads to asymmetric distortion of the shape of the interference rhombus, which is manifested with a reduced length of the corresponding section of the diagonal. On the contrary, as the force of the muscle increases, the corresponding section of the diagonal enhances. The displacement of the attachment site of direct extraocular muscle along the line of action is equivalent to a change in effort on its part, indicated appropriately by the shape of the interference rhombus. As the muscle moves away from the line of action, the angle of the interference rhombus is shifted away from the corresponding meridian. Key words: polarized light, optical anisotropy, cornea, extra−ocular muscles, interference picture.

scholarly journals Recent Advances in Photoalignment Liquid Crystal Polarization Gratings and Their Applications

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 900
Author(s):  
Tiegang Lin ◽  
Jin Xie ◽  
Yingjie Zhou ◽  
Yaqin Zhou ◽  
Yide Yuan ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Optical Anisotropy ◽  
Review Paper ◽  
Fabrication Process ◽  
Polarization Gratings ◽  
High Diffraction Efficiency ◽  
Physical Principles ◽  
High Diffraction ◽  
Exposure Methods ◽  
Beam Split

Liquid crystal (LC) circular polarization gratings (PGs), also known as Pancharatnam–Berry (PB) phase deflectors, are diffractive waveplates with linearly changed optical anisotropy axes. Due to the high diffraction efficiency, polarization selectivity character, and simple fabrication process, photoalignment LC PGs have been widely studied and developed especially in polarization management and beam split. In this review paper, we analyze the physical principles, show the exposure methods and fabrication process, and present relevant promising applications in photonics and imaging optics.

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