Strain-Induced Spectral Tuning of the Whispering Gallery Modes in a Cylindrical Micro-Resonator Formed by a Polymer Optical Fiber

Authors

Vishnu Kavungal, Technological University DublinFollow
Arun Mallik, Technological University DublinFollow
Gerald Farrell, Technological University Dublin
Qiang Wu, Northumbria UniversityFollow
Yuliya Semenova, Technological University DublinFollow

Document Type

Article

Disciplines

2. ENGINEERING AND TECHNOLOGY

Publication Details

Applied Optics, Vol. 56, No. 5, Frebruary 2017.

Abstract

A mechanical strain assisted technique for spectral tuning of whispering gallery modes (WGM) in a cylindrical micro-resonator formed by a polymer optical fiber (POF) is investigated. WGMs in the POF-based micro-cylinder are excited by evanescent light coupling using a tapered single mode silica fiber. WGMs observed in the transmission spectrum of the silica fiber taper have a high extinction ratio of up to 19 dB and a quality factor (Q-factor) of up to 2.64 × 104. The application of tensile axial strain (με) in the range from 0 to 1746 με (0.17%) to the POF micro-resonator results in a linear shift of the WGM spectrum with a sensitivity of 0.66 pm/με. Under the influence of the applied strain, the WGMs undergo a blue shift and return to their initial spectral positions after the strain is decreased. The proposed strain tunable POF micro-resonator has potential applications in fiber optic sensing and tunable micro lasers.

DOI

https://doi.org/10.1364/AO.56.001339

Recommended Citation

Kavungal, V., Mallik, A. & Semenova, Y. (2017). Strain-induced spectral tuning of the whispering gallery modes in a cylindrical micro-resonator formed by a polymer optical fiber. Applied Optics, vol. 56, no. 5. doi.org/10.1364/AO.56.001339

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