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Multiphoton-absorption induced ultraviolet luminescence of ZnO nanorods using low-energy femtosecond pulses
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10.1063/1.3468632
/content/aip/journal/jap/108/4/10.1063/1.3468632
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/4/10.1063/1.3468632

Figures

Image of FIG. 1.
FIG. 1.

SEM images of the ZnO nanorod arrays grown by VLS mechanism.

Image of FIG. 2.
FIG. 2.

XRD; (inset: rocking curve) for the ZnO nanorod arrays grown by VLS mechanism.

Image of FIG. 3.
FIG. 3.

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.]

Image of FIG. 4.
FIG. 4.

Double-logarithmic plot of the UV luminescence signal as a function of the laser peak power. Scattered points: experimental data; solid line: linear fit.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

Variation in the two-photon and three-photon absorbance for excitation with a 13 fs pulse with a central wavelength of 800 nm.

Image of FIG. 7.
FIG. 7.

Polarization dependence behavior of SHG and MPA-induced luminescence signal (MPAL).

Tables

Generic image for table
Table I.

FWHM and peak position of UV-PL and SHG at different peak power levels.

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/content/aip/journal/jap/108/4/10.1063/1.3468632
2010-08-25
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Multiphoton-absorption induced ultraviolet luminescence of ZnO nanorods using low-energy femtosecond pulses
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/4/10.1063/1.3468632
10.1063/1.3468632
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