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Title: Second harmonic generation from the `centrosymmetric' crystals
Authors: Nalla, Venkatram
Medishetty, Raghavender
Wang, Yue
Bai, Zhaozhi
Sun, Handong
Wei, Ji.
Vittal, Jagadese J.
Keywords: DRNTU::Science::Physics::Optics and light
Issue Date: 2015
Source: Nalla, V., Medishetty, R., Wang, Y., Bai, Z., Sun, H., Wei, J., et al. (2015). Second harmonic generation from the `centrosymmetric' crystals. IUCrJ, 2(3).
Series/Report no.: IUCrJ
Abstract: Second harmonic generation (SHG) is a well known non-linear optical phenomena which can be observed only in non-centrosymmetric crystals due to non-zero hyperpolarizability. In the current work we observed SHG from a Zn(II) complex which was originally thought to have crystallized in the centrosymmetric space group C2/c. This has been attributed to the unequal antiparallel packing of the metal complexes in the non-symmetric space group Cc or residual non-centrosymmetry in C2/c giving rise to polarizability leading to strong SHG. The enhancement of SHG by UV light has been attributed to the increase in non-centrosymmetry and hence polarity of packing due to strain induced in the crystals. The SHG signals measured from these crystals were as large as potassium dihydrogen phosphate crystals, KH2PO4 (KDP), and showed temperature dependence. The highest SHG efficiency was observed at 50 K. The SHG phenomenon was observed at broad wavelengths ranging from visible to below-red in these crystals.
ISSN: 2052-2525
DOI: 10.1107/S2052252515002183
Rights: This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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