First correct Experimental Discovery of “Weak Gyrotropy” of Transparent Non-Centrosymmetric “Non-Gyrotropic” Crystals, Using the LiNbO3 Crystal as an Example


The goal of this study was to identify the influence of “weak” gyrotropy in “non-gyrotropic” transparent non-centrosymmetric crystals. The initial experiment was based on light transmission (T) measurements of the system: Polarizer – wedge-shaped Crystal sample – Analyzer (orthogonal to Polarizer). It was shown that if the optical axis of the crystal is parallel to the wedge’s rib and the polarisation of the linear-polarized incident light, the system’s transmission T cannot be zero (due to the existence of nonzero components (G12) of the antisymmetric pseudotensor of gyration G described the “weak” gyrotropy). Using the LiNbO3 crystal as an example, such nonzero T was discovered for the first time experimentally. The absolute value of the LiNbO3 crystal’s component G12 was initially calculated: ([G12] = (1.50 +/- 0.51) 10-6).

Physics and mathematics are the two subjects covered.

Author(s) Details:

A. Kh. Zilbershtein,
Institute of Precambrian Geology and Geochronology (Russian Academy of Sciences), Saint-Petersburg, Russia and University of Cologne, Cologne, Germany.

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