Reciprocity is a fundamental principle in optics, requiring that the response of a transmission
channel is symmetric when source and observation points are interchanged. It is of major …

Controlling emission and absorption, and radiative heat transfer, is important for photonic
energy conversion and thermal management. However, the reciprocal emission and …

Asymmetric coupling amplitudes effectively create an imaginary gauge field, which induces
a non-Hermitian Aharonov-Bohm (AB) effect. Nonzero imaginary magnetic flux invalidates …

Unconventional properties of non-Hermitian systems, such as the existence of exceptional
points, have recently been suggested as a resource for sensing. The impact of noise and …

Topological photonics has emerged as a route to robust optical circuitry protected against
disorder, and now includes demonstrations such as topologically protected lasing,–and …

Nonreciprocal components, such as isolators and circulators, provide highly desirable
functionalities for optical circuitry. This motivates the active investigation of mechanisms that …

Motivated by the demands of integrated and silicon photonics, there is significant interest in
optical isolators in on-chip integrated systems. Recent works have therefore explored …

The application of topology, the mathematics of conserved properties under continuous
deformations, is creating a range of new opportunities throughout photonics. This field was …

Stimulated Brillouin scattering is a fundamental interaction between light and travelling
acoustic waves and arises primarily from electrostriction and photoelastic effects, with an …

Optical isolators today are exclusively built on magneto-optic principles but are not readily
implemented within photonic integrated circuits. So far, no magnetless alternative …