Studies of geometrical profiling in fabricated tapered optical fibers using whispering gallery modes spectroscopy

Kavungal, Vishnu, Farrell, Gerald, Wu, Qiang, Kumar Mallik, Arun and Semenova, Yuliya (2018) Studies of geometrical profiling in fabricated tapered optical fibers using whispering gallery modes spectroscopy. Optical Fiber Technology, 41. pp. 82-88. ISSN 1068-5200

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Abstract

This paper experimentally demonstrates a method for geometrical profiling of asymmetries in fabricated thin microfiber tapers with waist diameters ranging from ∼10 to ∼50 µm with submicron accuracy. The method is based on the analysis of whispering gallery mode resonances excited in cylindrical fiber resonators as a result of evanescent coupling of light propagating through the fiber taper. The submicron accuracy of the proposed method has been verified by SEM studies. The method can be applied as a quality control tool in fabrication of microfiber based devices and sensors or for fine-tuning of microfiber fabrication set-ups.

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