Abstract
We have been establishing the technique of fabricating spherical semiconductor microcrystals with suitable diameters for whispering gallery mode (WGM) lasing. Concretely, semiconductor microspheres were synthesized by ablating various semiconductor-sintered targets with focused pulsed laser at high fluences. In this report, dependences of fabricated zinc oxide (ZnO) microstructures on laser wavelengths were investigated. Lasing characteristics and photoluminescence of ZnO microspheres were determined, and photoluminescence of Sb-doped ZnO microspheres were determined. Additionally, it was also found that Sb-doped ZnO and aluminum nitride microspheres can be similarly synthesized. By developing this method, which does not require complex processing, it is expected that efforts in the application of WGM lasing are accelerated in many kinds of semiconductors.
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Abbreviations
- ZnO:
-
Zinc oxide
- UV:
-
Ultraviolet
- NAPLD:
-
Nanoparticle-assisted pulsed laser deposition
- LED:
-
Light-emitting diode
- LD:
-
Laser diode
- WGM:
-
Whispering gallery mode
- AlN:
-
Aluminum nitride
- SEM:
-
Scanning electron microscopy
- RT-PL:
-
Room temperature photoluminescence
- NBE:
-
Near band edge
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Acknowledgments
The authors would like to thank Mr. Yosuke Watanabe of Department of Gigaphoton Next GLP for their supports in the experiment. This work was supported in part by the Program under Special Coordination Funds for Promoting Science and Technology from Japan Science and Technology Agency (JST) and a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS, No. 24656053).
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Shimogaki, T., Okazaki, K., Yamasaki, K. et al. Fabrication and characterization of spherical micro semiconductor crystals by laser ablation method. Appl. Phys. A 117, 269–273 (2014). https://doi.org/10.1007/s00339-014-8529-6
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DOI: https://doi.org/10.1007/s00339-014-8529-6