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

Hong Zhe Wang; Arun Kumar Mallik; Fangfang Wei; Zhuochen Wang; Anuradha Rout; Qiang Wu; Yuliya Semenova

doi:10.1364/OE.432103

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

Hong Zhe Wang, Arun Kumar Mallik, Fangfang Wei, Zhuochen Wang, Anuradha Rout, Qiang Wu, Yuliya Semenova

Mathematics, Physics and Electrical Engineering

Research output: Contribution to journal › Article › peer-review

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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.

Original language	English
Pages (from-to)	23569-23581
Number of pages	13
Journal	Optics Express
Volume	29
Issue number	15
Early online date	9 Jul 2021
DOIs	https://doi.org/10.1364/OE.432103
Publication status	Published - 19 Jul 2021

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title = "Thermo-optic tuning of a nematic liquid crystal-filled capillary whispering gallery mode resonator",

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.",

author = "Wang, {Hong Zhe} and Mallik, {Arun Kumar} and Fangfang Wei and Zhuochen Wang and Anuradha Rout and Qiang Wu and Yuliya Semenova",

note = "Funding information: Technological University Dublin (Fiosraigh Scholarship Award 2019); Department of Agriculture, Food and the Marine, Ireland (17/F/284).",

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T1 - Thermo-optic tuning of a nematic liquid crystal-filled capillary whispering gallery mode resonator

AU - Wang, Hong Zhe

AU - Mallik, Arun Kumar

AU - Wei, Fangfang

AU - Wang, Zhuochen

AU - Rout, Anuradha

AU - Wu, Qiang

AU - Semenova, Yuliya

N1 - Funding information: Technological University Dublin (Fiosraigh Scholarship Award 2019); Department of Agriculture, Food and the Marine, Ireland (17/F/284).

PY - 2021/7/19

Y1 - 2021/7/19

N2 - 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.

AB - 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.

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

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