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(a) Scanning electron micrograph of a microtube and its U-shaped mesa (dashed lines). (b) Unscaled sketch of the freestanding part of the tube.
Excitation power dependent measurements of the microtube in Fig. 1. (a) Time evolution of the emitted PL light. (b) PL spectra. (c) Time-integrated PL intensity and delay time between pump pulse and PL emission. (d) Wavelength of the lasing mode in the time-integrated spectra.
(a) False-color images by the streak camera for different excitation powers. [(b)–(d)] Time evolution of the amplitude, wavelength, and width of the lasing mode obtained by Gaussian fits at all times in (a). [(e)–(g)] Results for the time evolution of the photon density (e) and the charge carrier density (f) for three pump rates marked in the pump rate dependent photon density in (g), calculated by rate equations.
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