In recent years, notions drawn from non-Hermitian physics and parity–time (PT) symmetry
have attracted considerable attention. In particular, the realization that the interplay between …

The growing maturity of nanofabrication has ushered massive sophisticated optical
structures available on a photonic chip. The integration of subwavelength-structured …

The emerging field of plasmonics has yielded methods for guiding and localizing light at the
nanoscale, well below the scale of the wavelength of light in free space. Now plasmonics …

Carbon dots (CDs) are a new solution-processable laser material. They offer advantages of
non-toxicity, low cost, and high stability, making them attractive for the sustainable …

The unprecedented ability of nanometallic (that is, plasmonic) structures to concentrate light
into deep-subwavelength volumes has propelled their use in a vast array of nanophotonics …

The ability to control the modes oscillating within a laser resonator is of fundamental
importance. In general, the presence of competing modes can be detrimental to beam …

The vivid optical properties of noble metal nanoparticles have been an object of fascination
since ancient times. The ruby red of stained glass windows arises from gold nanoparticles …

Recent years have seen a rapid expansion of research into nanophotonics based on
surface plasmon–polaritons. These electromagnetic waves propagate along metal …

Lasing applications have spread over various aspects of human life. To meet the develo**
trends of the laser industry towards being miniature, portable, and highly integrated, new …

Coinage metals, such as Au, Ag, and Cu, have been important materials throughout
history.(1) Although in ancient cultures they were admired primarily for their ability to reflect …