Optical systems combining balanced loss and gain provide a unique platform to implement
classical analogues of quantum systems described by non-Hermitian parity–time (PT)-…

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 …

There is a strong demand for portable systems that can detect and characterize individual
pathogens and other nanoscale objects without the use of labels, for applications in human …

By exploiting recent developments associated with coupled microcavities, we introduce the
concept of the PT -symmetric phonon laser with balanced gain and loss. This is …

The Coronavirus Disease 2019 (COVID-19) pandemic has become a global crisis and is
more devastating than any other previous infectious disease. It has affected a significant …

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 threshold. …

The ability to detect and size individual nanoparticles with high resolution is crucial to
understanding the behaviour of single particles and effectively using their strong size-dependent …

… Huan Han , Lan Yang , Rui Liu , Fang Liu , Kai-lang Wu , Jie Li , Xing-hui Liu EMAIL logo and
Cheng-liang Zhu EMAIL logo … aHuan Han and Lan Yang contributed equally to this work. …

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