Second harmonic generation from the `centrosymmetric' crystals
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 centrosymme...
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| Language: | English |
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International Union of Crystallography
2015-05-01
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| Series: | IUCrJ |
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| Online Access: | http://scripts.iucr.org/cgi-bin/paper?S2052252515002183 |
| _version_ | 1818085650860081152 |
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| author | Venkatram Nalla Raghavender Medishetty Yue Wang Zhaozhi Bai Handong Sun Ji. Wei Jagadese J. Vittal |
| author_facet | Venkatram Nalla Raghavender Medishetty Yue Wang Zhaozhi Bai Handong Sun Ji. Wei Jagadese J. Vittal |
| author_sort | Venkatram Nalla |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-10T20:13:10Z |
| format | Article |
| id | doaj.art-f870461e50864c29a1923520f6bae8a2 |
| institution | Directory Open Access Journal |
| issn | 2052-2525 |
| language | English |
| last_indexed | 2024-12-10T20:13:10Z |
| publishDate | 2015-05-01 |
| publisher | International Union of Crystallography |
| record_format | Article |
| series | IUCrJ |
| spelling | doaj.art-f870461e50864c29a1923520f6bae8a22022-12-22T01:35:15ZengInternational Union of CrystallographyIUCrJ2052-25252015-05-012331732110.1107/S2052252515002183ed5004Second harmonic generation from the `centrosymmetric' crystalsVenkatram Nalla0Raghavender Medishetty1Yue Wang2Zhaozhi Bai3Handong Sun4Ji. Wei5Jagadese J. Vittal6Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, SingaporeDepartment of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, SingaporeDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, SingaporeDepartment of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, SingaporeCentre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, SingaporeDepartment of Physics, National University of Singapore, 3 Science Drive 3, Singapore 117542, SingaporeDepartment of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, SingaporeSecond 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.http://scripts.iucr.org/cgi-bin/paper?S2052252515002183second harmonic generationcentrosymmetric crystals |
| spellingShingle | Venkatram Nalla Raghavender Medishetty Yue Wang Zhaozhi Bai Handong Sun Ji. Wei Jagadese J. Vittal Second harmonic generation from the `centrosymmetric' crystals IUCrJ second harmonic generation centrosymmetric crystals |
| title | Second harmonic generation from the `centrosymmetric' crystals |
| title_full | Second harmonic generation from the `centrosymmetric' crystals |
| title_fullStr | Second harmonic generation from the `centrosymmetric' crystals |
| title_full_unstemmed | Second harmonic generation from the `centrosymmetric' crystals |
| title_short | Second harmonic generation from the `centrosymmetric' crystals |
| title_sort | second harmonic generation from the centrosymmetric crystals |
| topic | second harmonic generation centrosymmetric crystals |
| url | http://scripts.iucr.org/cgi-bin/paper?S2052252515002183 |
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