Optical biosensors are frontrunners for the rapid and real-time detection of analytes,
particularly for low concentrations. Among them, whispering gallery mode (WGM) resonators …

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

Optical whispering-gallery-mode microsensors are a promising platform for many
applications, such as biomedical monitoring, magnetic sensing, and vibration detection …

Dielectric microelements with circular symmetry have shown interesting optical properties:
photonic nanojets (PNJs) and whispering gallery modes (WGMs). They can confine light …

Optical whispering-gallery-mode microresonators with ultrahigh quality factors and small
mode volumes have played an important role in modern physics. They have been …

The photonic nanojet (PNJ) is a narrow high-energy beam that was originally found on the
back side of all-dielectric spherical structures. It is a unique type of energy concentration …

Hybrid cavity-antenna systems have been proposed to combine the sub-wavelength light
confinement of plasmonic antennas with microcavity quality factors Q. Here, we examine …

Optical microresonators have attracted intense interests in highly sensitive molecular
detection and optical precision measurement in the past decades. In particular, the …

Surface‐enhanced Raman spectroscopy (SERS) is a powerful tool for nondestructive and
ultrasensitive optical trace‐detection. However, the sophisticated fabrication processes and …

Ultrasensitive detection of trace substances holds significant importance in chemical
analysis and biochemical sensing. As an exceptionally robust spectroscopic technique …