Whispering gallery mode resonances in thermally poled borosilicate glass optical microcavities

e-pub ahead of print date: 21 June 2021

Published date: 25 June 2021

Additional Information: Funding Information: The effect of thermal poling on the polarization-resolved WGM spectra, excited evanescently through a microtaper, is depicted in Fig.1(c) & (d). The unpoled sample supports a large number of WGM families, with Q-factors of ~ 2x104 measured for both polarisations. The corresponding spectra obtained after thermal poling (see Fig.1(d)) show an impressive spectral clean-up with one dominant WGM family (FSR ~4.9nm) for both TE & TM polarisations. In addition, the TE WGM resonances showed a Q-factor reduction by a factor of ~x3, while TM resonances retained their original Qs. This can associated with spatially-restricted and polarization-dependent losses introduced by thermal poling within the glass microresonator. It is known that breaking of the ionic centrosymmetry of the glass and the particular poling geometry, optical losses are introduced [3]. While there have been examples were polarization control is achieved in WGM resonators by using plasmonic layers [4], the present results show suppression of the TE polarization without sacrificing the Q-factor performance of the TM part. We believe the WGM changes in poled microresonators can be utilized in the development of high-voltage sensors, and, for studying the spatial distribution characteristics of poling in glasses; more results will be presented on-site. This work was partially funded by the EU H2020 ACTPHAST 4.0 779472, ACTPHAST 4R 825051 projects and State Scholarship Foundation (IKY) within the framework of ESPA 2014-2020.

Venue - Dates: 2021 European Conference on Lasers and Electro-Optics, CLEO/Europe 2021, , Virtual, Online, Germany, 2021-06-21 - 2021-06-25

Related URLs:

• http://www.scopus.com/inward/r...D=8YFLogxK

Local EPrints ID: 473831

URI: http://eprints.soton.ac.uk/id/eprint/473831

DOI: doi:10.1109/CLEO/Europe-EQEC52157.2021.9542571

PURE UUID: e6901df5-ea7b-480d-9c39-22a3202f0dc5

ORCID for Chris Craig: orcid.org/0000-0001-6919-4294

ORCID for Daniel W. Hewak: orcid.org/0000-0002-2093-5773

ORCID for Michalis N. Zervas: orcid.org/0000-0002-0651-4059

Date deposited: 01 Feb 2023 17:39

Last modified: 18 Mar 2024 03:21