Nonlinear optical sub-bandgap excitation of ZnO-based photonic resonators

Zinc oxide (ZnO) is a versatile candidate for photonic devices due to its highly efficient optical emission. However, for pumping of ZnO photonic devices UV-sources are required. Here, we investigate the alternative usage of widely available pulsed near-infrared (NIR)-sources and compare the efficie...

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Veröffentlicht in:Journal of applied physics 2015-12, Vol.118 (21)
Hauptverfasser: Bader, Christina A., Zeuner, Franziska, Bader, Manuel H. W., Zentgraf, Thomas, Meier, Cedrik
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Sprache:eng
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Zusammenfassung:Zinc oxide (ZnO) is a versatile candidate for photonic devices due to its highly efficient optical emission. However, for pumping of ZnO photonic devices UV-sources are required. Here, we investigate the alternative usage of widely available pulsed near-infrared (NIR)-sources and compare the efficiency of linear and nonlinear excitation processes. We found that bulk ZnO, ZnO thin films grown by molecular beam epitaxy, and ZnO/SiO2 microdisk devices exhibit strong nonlinear response when excited with NIR pulses (λ ≈ 1060 nm). In addition, we show that the ZnO/SiO2 microdisks exhibit sharp whispering gallery modes over the blue-yellow part of the visible spectrum for both excitation conditions and high Q-factors up to Q = 4700. The results demonstrate that nonlinear excitation is an efficient way to pump ZnO photonic devices.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4936768