1. Effect of Lorentz local field for optical second order nonlinear susceptibility in ZnO nanorod.
- Author
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Zhuo, Guan-Yu, Hsu, Kuo-Jen, Su, Tung-Yu, Huang, Nan-Hsun, Chen, Yang-Fang, and Chu, Shi-Wei
- Subjects
ZINC oxide ,REDSHIFT ,NANORODS ,NANOSTRUCTURED materials ,OPTOELECTRONICS - Abstract
Nonlinear optical properties of ZnO nanorods (NRs) are strongly influenced by its dimension and aspect ratio. Size-dependent second harmonic generation (SHG) in ZnO NRs has been investigated with polarized excitations recently. However, detailed description to the SHG dependency with NR dimensions has not yet been given. In this paper, the relationship between rod diameter/length and corresponding χ(2) values based on Lorentz local field is established, both theoretically and experimentally, for the first time. Theoretically, Lorentz local field induced spectral red shift and the consequent dielectric constant modification is used to elucidate the size effect for χ(2) under the condition that both excitation and SHG wavelengths are far from the band gap. Experimentally, χ(2) of ZnO nanorods with various sizes is measured via Maker fringe technique, and the results fit well to our theory. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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