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Emission spectra for different excitation intensities at . The spectra were shifted vertically for clarity. The left inset shows a SEM image of a ZnO microwire . A typical dependence of the emitted PL intensity of a selected lasing peak (denoted by an arrow in the spectrum) on the excitation intensity is shown in the right inset. The superlinear behavior is clearly visible.
(a) Comparision of an experimental lasing spectrum to the peak positions at predicted by Eq. (1). The calculated peak positions are marked by the dashed lines with labelled interference order . The diameter of the respective wire was . (b) The refractive index of ZnO perpendicular to the axis. The dashed curve is the refractive index measured by spectroscopic ellipsometry on ZnO thin films at . The solid line represents obtained from the best fit of the peak positions. (a) and (b) fit to the same energy scale.
Dependences of the resonant energies on the interference order for different wire diameters as indicated on top of the graph. Lines are the predicted theoretical values calculated from Eq. (1) using diameter values obtained from SEM measurements; the symbols represent the experimentally observed peaks measured at .
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