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Whispering gallery mode (WGM) resonators have enabled real-world sensing
applications by measuring physical quantities, such as temperature, mass, and
pressure, as well as chemical and biomedical parameters. In the latter context,
important achievements, such as label-free detection of a single virus, single
molecules, and large objects, such as bacteria, have been recorded. We try to
provide a quick overview of the state of the art of WGM-based sensors.
A summary of the fundamental principles, the mathematical theory, and the
main properties of different types of such resonators is also given.
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