Abstract
An optically pumped ZnO nanowire laser with a 10-period SiO2/SiN x distributed Bragg reflector (DBR) was demonstrated. Stimulated emissions with equally distributed Fabry–Pérot lasing modes were observed at pumping powers larger than 121 kW/cm2. This result, when compared to nanowires of the same length and without a DBR structure, shows that a lower threshold of pumping power, higher quality factor, and larger cavity finesse can be achieved due to the high reflectivity of the DBR in the designed wavelength range. A coexistence of stimulated and spontaneous emissions was also observed above threshold and was attributed to partially confined waveguide modes in nanowires with diameters smaller than 100 nm.
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Acknowledgements
This work is supported by NSF (Grant No. ECCS-0900978). The authors thank Krassimir N. Bozhilov for assistance in TEM imaging.
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Kong, J., Chu, S., Huang, J. et al. Use of distributed Bragg reflectors to enhance Fabry–Pérot lasing in vertically aligned ZnO nanowires. Appl. Phys. A 110, 23–28 (2013). https://doi.org/10.1007/s00339-012-7330-7
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DOI: https://doi.org/10.1007/s00339-012-7330-7