Lasers are the pillars of modern optics and sensing. Microlasers based on whispering-
gallery modes (WGMs) are miniature in size and have excellent lasing characteristics …

Exploiting the interplay between gain, loss and the coupling strength between different
optical components creates a variety of new opportunities in photonics to generate, control …

The term whispering gallery mode (WGM) was first introduced to describe the curvilinear
propagation of sound waves under a cathedral dome. The physical concept has now been …

Nature achieves differentiation of specific and nonspecific binding in molecular interactions
through precise control of biomolecules in space and time. Artificial systems such as …

Sensors play an important part in many aspects of daily life such as infrared sensors in
home security systems, particle sensors for environmental monitoring and motion sensors in …

Temperature is one of the most fundamental physical properties to characterize various
physical, chemical, and biological processes. Even a slight change in temperature could …

Optical sensors are widely used for refractive index measurement in chemical, biomedical,
and food processing industries. Due to specific field distribution of the resonances, optical …

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

Controlling the emission and the flow of light in micro-and nanostructures is crucial for on-
chip information processing. Here we show how to impose a strong chirality and a …

Controlling and reversing the effects of loss are major challenges in optical systems. For
lasers, losses need to be overcome by a sufficient amount of gain to reach the lasing …