Publication: Evolution of whispering gallery modes in Li-doped ZnO hexagonal micro- and nanostructures
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Publication Date
2020-12-01
Authors
Pavón Martínez, Fernando
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MDPI
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Abstract
The investigated materials have great potential for integrated optoelectronic devices. The possibility to integrate them into the same material as optical resonator and light guide opens the door to the fabrication of highly compact devices. The formation of optical cavities in Li-doped ZnO nanostructures was investigated. By means of the vapor-solid method, long micro- and nanostructures with a hexagonal cross-section were grown. These morphologies were favorable for Fabry-Perot and whispering gallery modes to appear. A variety of structures with different sections was studied using mu-photoluminescence in both the transverse electric (TE) and transverse magnetic (TM) polarizations, showing well-pronounced optical resonant modes. The results showed a dominance of whispering gallery modes that were in good agreement with the calculated refractive index. The quality factor (Q) and finesse (F) were estimated, which demonstrated the quality of Li:ZnO structures as optical cavities.
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© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
The authors are grateful to the Complutense University of Madrid and Banco Santander for support via the project UCM-Santander 2019 (PR87/19-22613) and to the Spanish Ministry of Science, Innovation and Universities for support via the project MINECO/FEDER-MAT2015-65274-R. B.S. acknowledges financial support from Comunidad de Madrid and Complutense University of Madrid (Ayudas del Programa de Atraccion de Talento 2017-T2/IND-5465). R.A. acknowledges the European Social Fund (ESF) and the Youth Employment Initiativey (YEI) of the Madrid region through the PEJD-2019-PRE/IND-16755 grant.