SEM images of the ZnO nanorod arrays grown by VLS mechanism.
XRD; (inset: rocking curve) for the ZnO nanorod arrays grown by VLS mechanism.
The emission spectra in ZnO nanorods grown by VLS mechanism when excited by a broadband pulse having central wavelength at . The pulse energy was 4.16 nJ as directly extracted from Ti:sapphire laser oscillator without amplifier (peak power ) [Inset: the multiple-Gaussian fits (dotted curves) show the UV luminescence and SHG components of this spectrum. The solid line represent the sum of both fit and the scattered rectangular points display the real spectrum.]
Double-logarithmic plot of the UV luminescence signal as a function of the laser peak power. Scattered points: experimental data; solid line: linear fit.
MPA-induced emission spectra generated in ZnO nanorods grown by VLS mechanism at different excitation densities. The scattered rectangular points represent the original signal. Dashed curves: fit curves for UV and SHG contributions obtained by multi-Gaussian decomposition algorithm. The upper dashed curves represent the sum of both fit. The excitation densities were 33.95, 9.62, and for (a), (b), and (c), respectively.
Variation in the two-photon and three-photon absorbance for excitation with a 13 fs pulse with a central wavelength of 800 nm.
Polarization dependence behavior of SHG and MPA-induced luminescence signal (MPAL).
FWHM and peak position of UV-PL and SHG at different peak power levels.
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