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Second-harmonic performance of -axis-oriented ZnO nanolayers on sapphire substrates
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View: Figures


Image of FIG. 1.
FIG. 1.

ZnO films of high second order susceptibility. SEM images of two samples with -axis oriented nanocrystallites on -plane sapphire, grown at 400 °C (a) and 500 °C (b) with a thickness of 150 and 300 nm, respectively. The arrows mark the (0001) orientation (-axis) of the crystallites, whereas their -axes would be directed normal to the paper plane. The orientation was not concluded from these images itself, but from the measurements cf. Figs. 2 and 3.

Image of FIG. 2.
FIG. 2.

X-ray diffraction curves (-scans) from (a) ZnO and (b) and ZnO . From the relative peak positions, the orientation of the ZnO grains with respect to the substrate is obtained. At the top, two rocking curves from ZnO are shown. Bullets: sample as in Fig. 1(a), open circles: sample as in Fig. 1(b).

Image of FIG. 3.
FIG. 3.

Polarization characteristics of SHG at normal incidence for the ZnO film in Fig. 1(a). Experimental data (open squares) is compared to a simple theoretical model (, thick gray). Depending on polarization, two different components of the susceptibility tensor contribute (-polarization, dashed and -polarization, dotted). The peak positions at 90° and 270° correspond to a ZnO -axis orientation parallel to the electric field vector.

Image of FIG. 4.
FIG. 4.

Measured (symbols) and simulated (lines) dependence of the SHG intensity on tilt angle. The asymmetry stems from saw-tooth like facetting of the crystallites. Both, -axis and -axis oriented ZnO films have been considered for tilt in the - and the -polarization plane. Theoretical curves are based on identical -tensor values, assuming a 6° tilt angle of the crystallite facettes relative to the surface. Film1a and film1b refer to the two different samples in Fig. 1. The -axis values are shown for comparison.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Second-harmonic performance of a-axis-oriented ZnO nanolayers on sapphire substrates