Thermo-optic tuning of a nematic liquid crystal-filled capillary whispering gallery mode resonator

Wang, Zhe, Mallik, Arun Kumar, Wei, Fangfang, Wang, Zhuochen, Rout, Anuradha, Wu, Qiang and Semenova, Yuliya (2021) Thermo-optic tuning of a nematic liquid crystal-filled capillary whispering gallery mode resonator. Optics Express, 29 (15). pp. 23569-23581. ISSN 1094-4087

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Official URL: https://doi.org/10.1364/OE.432103

Abstract

A novel tunable whispering gallery modes (WGMs) resonator based on a nematic liquid crystal (LC)-filled capillary and magnetic nanoparticles (MNPs)-coated tapered fiber has been proposed and experimentally demonstrated. Thermo-optic tuning of the WGM resonances has been demonstrated by varying optical pump laser power injected into the MNPs-coated fiber half-taper inside the capillary. The tuning mechanism relies on the change of the effective refractive index (RI) of the nematic LC, caused by the photo-thermal effect of MNPs on the surface of the fiber half-taper inducing a temperature change inside the capillary. Tuning of the WGM resonances with sensitivities of 101.5 ± 3.5 pm/mW and 146.5 ± 3.5 pm/mW and tuning ranges of 1.96 nm and 3.28 nm respectively for the two types of liquid crystals (MLC-7012, MDA-05-2782) has been demonstrated. In addition, the relationship between the optical power of the pump laser and the local temperature of the nematic LC was investigated and the heating rate is estimated as 1.49 °C/mW. The proposed thermo-optic tuning scheme has many potential applications in tunable photonic devices and sensors.

Item Type: Article
Additional Information: © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement Funding information: Technological University Dublin (Fiosraigh Scholarship Award 2019); Department of Agriculture, Food and the Marine, Ireland (17/F/284).
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 16 Jul 2021 14:56
Last Modified: 16 Jul 2021 15:00
URI: http://nrl.northumbria.ac.uk/id/eprint/46695

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