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Second harmonic generation from the `centrosymmetric' crystals

หน่วยงาน Nanyang Technological University, Singapore

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ชื่อเรื่อง : Second harmonic generation from the `centrosymmetric' crystals
นักวิจัย : Nalla, Venkatram , Medishetty, Raghavender , Wang, Yue , Bai, Zhaozhi , Sun, Handong , Wei, Ji. , Vittal, Jagadese J.
คำค้น : DRNTU::Science::Physics::Optics and light
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2558
อ้างอิง : 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). , 2052-2525 , http://hdl.handle.net/10220/25304 , http://dx.doi.org/10.1107/S2052252515002183
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : IUCrJ
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

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.

MOE (Min. of Education, S’pore)

บรรณานุกรม :
Nalla, Venkatram , Medishetty, Raghavender , Wang, Yue , Bai, Zhaozhi , Sun, Handong , Wei, Ji. , Vittal, Jagadese J. . (2558). Second harmonic generation from the `centrosymmetric' crystals.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Nalla, Venkatram , Medishetty, Raghavender , Wang, Yue , Bai, Zhaozhi , Sun, Handong , Wei, Ji. , Vittal, Jagadese J. . 2558. "Second harmonic generation from the `centrosymmetric' crystals".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Nalla, Venkatram , Medishetty, Raghavender , Wang, Yue , Bai, Zhaozhi , Sun, Handong , Wei, Ji. , Vittal, Jagadese J. . "Second harmonic generation from the `centrosymmetric' crystals."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2558. Print.
Nalla, Venkatram , Medishetty, Raghavender , Wang, Yue , Bai, Zhaozhi , Sun, Handong , Wei, Ji. , Vittal, Jagadese J. . Second harmonic generation from the `centrosymmetric' crystals. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2558.