1 research outputs found
Backscattering-Induced Chiral Absorption in Optical Microresonators
Chirality
in micro- and nanophotonic structures is crucial for
both fundamental research and applied technology. Here, we experimentally
demonstrate chiral absorption via backscattering in a single whispering-gallery
microresonator under simultaneous excitation from both ports. Remarkably,
this scheme does not rely on any nonlinear effects or the breaking
of parity or time-reversal symmetry. These intriguing phenomena occur
due to the interference between the clockwise- and counterclockwise-propagating
light fields induced by the backscattering. Furthermore, we also achieve
the chiral optical states in a coupled-microresonator system, which
can be utilized to manipulate the electromagnetically induced transparency
or absorption effect. Our work proposes a linear and all-optical scheme
to realize chiral optical states, which can help control the light
flow in photonic systems with a high operation rate