• Tutorial

Yuliya Semenova

Technological University Dublin

About Yuliya Semenova

Yuliya Semenova received her Master in Electronic Engineering degree from the
National University “Lviv Polytechnic” (Ukraine) in 1992 and her Ph.D. in Physics from
the Ukrainian Academy of Sciences in 1999. She is Professor in the School of Electrical
and Electronic Engineering at the Technological University Dublin, where she has
been since 2001, and Director of Photonics Research Centre since 2019. She has over
350 publications in the field of photonics with over 5500 citations to her work. She has given
numerous invited talks and tutorials and supervised to completion 14 PhD graduates. She is an
Associate Editor of IET Electronics Letters, Journal of Lightwave Technology and Sensors MDPI. Her
current research interests span both photonics and applications of photonic devices in engineering
with a focus on fiber optics. Much of her work to date has been on improving of design and
performance of optical fiber sensors with applications ranging from macro- to nanoscales. Some of
the specific areas of her interests are: whispering gallery mode effects in microfiber resonators,
plasmonic structures and photonic (liquid) crystal fiber sensors.

Optical fiber microresonators: fundamentals and applications in ultrasensitive gas detection

Whispering gallery modes (WGMs) in dielectric microresonators with circular symmetry have become the focus of many theoretical and experimental studies due to their exceptional properties such as extremely small mode volumes, very high power density and narrow spectral linewidths. WGMs have found many applications ranging from unique tools to study nonlinear optical phenomena and quantum electrodynamics, to low threshold microlasers as well as very sensitive microsensors. Among the variety of optical microresonators shapes, materials and technologies, optical fiber micro resonators offer additional advantages of simpler and less expensive fabrication. This tutorial will introduce the fundamentals of fiber microresonators, review their fabrication methods, optical coupling techniques and applications for ultrasensitive detection of gases, volatile organic components (VOCs), liquid analytes and other physical parameters. Specific focus will be on the sensors based on polymer-coated microfiber resonators that rely on measurements of refractive index changes due to absorption of gas molecules by the coatings. Several specific examples of the microresonator based gas/VOC sensors and sensors will be presented including analysis and comparison of their performance. Microresonators for sensing of other parameters will also be briefly discussed. In conclusion, most recent developments, future prospects and challenges for the gas/VOC sensors will be discussed including the need for simultaneous detection of multiple gases/VOCs and overcoming the drawbacks of fabrication and readout complexity.

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