We present a comprehensive overview of sensor technology exploiting optical whispering
gallery mode (WGM) resonances. After a short introduction we begin by detailing the …

Optical whispering-gallery mode (WGM) microresonators, confining resonant photons in a
microscale volume for long periods of time, strongly enhance light-matter interactions …

Exceptional points (EPs) are special spectral degeneracies of non-Hermitian Hamiltonians
that govern the dynamics of open systems. At an EP, two or more eigenvalues, and the …

Gyroscopes are essential to many diverse applications associated with navigation,
positioning and inertial sensing. In general, most optical gyroscopes rely on the Sagnac …

Biosensing relies on the detection of molecules and their specific interactions. It is therefore
highly desirable to develop transducers exhibiting ultimate detection limits. Microcavities are …

Detection of nanoscale objects is highly desirable in various fields such as early‐stage
disease diagnosis, environmental monitoring and homeland security. Optical microcavity …

Existing methods for the optical detection of single molecules require the molecules to
absorb light to produce fluorescence or direct absorption signals,,. This limits the range of …

Optical microcavities that confine light in high-Q resonance promise all of the capabilities
required for a successful next-generation microsystem biodetection technology. Label-free …

Whispering gallery mode (WGM) optical microresonators have attracted intense interests in
the past decades. The combination of high quality factors (Q) and small mode volumes of …

Optical microresonators are essential to a broad range of technologies and scientific
disciplines. However, many of their applications rely on discrete devices to attain …