Linear and nonlinear optical properties of ZnO nanorod arrays
Xiao Si(肖思)a), Su Xiong-Rui(苏雄睿)a), Li Chun(李春)a), Han Yi-Bo(韩一波)a), Fang Guo-Jia(方国家)a)b), and Wang Qu-Quan(王取泉)a)b)†
a Department of Physics, Wuhan University, Wuhan 430072, China; b Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education, Wuhan University, Wuhan 430072, China
Abstract Polarization-dependent linear absorption, second-harmonic generation (SHG) and 3rd-order nonlinearities of well-aligned ZnO nanorod arrays have been investigated with ps pulses. The depressed spectral width and the enhanced intensity of reflective SHG along the long axis of ZnO nanorods were observed by using p-polarized pulses, which is explained by the optical confinements. The nonlinear absorption coefficient measured with s-polarization reached the maximum 4.0$\times $10$^{4}$cm/GW at the wavelength $\sim $750 nm, which revealed a large two-photon resonance absorption attributed to the quantum confined exciton when the polarization is vertical to the long axis of ZnO nanorod.
Received: 24 April 2007
Revised: 17 August 2007
Accepted manuscript online:
PACS:
42.65.Ky
(Frequency conversion; harmonic generation, including higher-order harmonic generation)
(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
Cite this article:
Xiao Si(肖思), Su Xiong-Rui(苏雄睿), Li Chun(李春), Han Yi-Bo(韩一波), Fang Guo-Jia(方国家), and Wang Qu-Quan(王取泉) Linear and nonlinear optical properties of ZnO nanorod arrays 2008 Chin. Phys. B 17 1291
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