Room temperature WGM resonances in the red spectral range from Ho3+ activated ZnO micro-spherical cavities

K. Fabitha, F. Nagasaki, Y. Fujiwara, Y. Wakiyama, D. Nakamura, M. S. Ramachandra Rao

Research output: Contribution to journalArticle

Abstract

Highly crystalline and smooth 1% Ho3+ doped ZnO microspheres with diameters ranging from 0.5 to 15 μm were synthesized using laser ablation technique. Near band edge whispering gallery mode (WGM) resonances from Ho:ZnO microspheres with a single oscillation route in the UV range are observed with 355 nm excitation. Apart from the significantly enhanced visible WGM resonances associated with intrinsic oxygen vacancy defects by Ho3+ doping, the visible range WGM resonances associated with the Ho3+ 5F55I8 emission at 629-690 nm are also observed with a 488 nm excitation. The WGMs of Ho3+ f-f emission possess lower threshold and high Q-factor values.

Original languageEnglish
Article number262102
JournalApplied Physics Letters
Volume112
Issue number26
DOIs
Publication statusPublished - Jun 25 2018

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whispering gallery modes
cavities
Q factors
room temperature
laser ablation
excitation
routes
oscillations
thresholds
defects
oxygen

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Room temperature WGM resonances in the red spectral range from Ho3+ activated ZnO micro-spherical cavities. / Fabitha, K.; Nagasaki, F.; Fujiwara, Y.; Wakiyama, Y.; Nakamura, D.; Ramachandra Rao, M. S.

In: Applied Physics Letters, Vol. 112, No. 26, 262102, 25.06.2018.

Research output: Contribution to journalArticle

Fabitha, K. ; Nagasaki, F. ; Fujiwara, Y. ; Wakiyama, Y. ; Nakamura, D. ; Ramachandra Rao, M. S. / Room temperature WGM resonances in the red spectral range from Ho3+ activated ZnO micro-spherical cavities. In: Applied Physics Letters. 2018 ; Vol. 112, No. 26.
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