Non-Hermitian (Complex-index) Nanophotonics

Non-Hermitian (NH) Nanophotonics that expands the conventional resonance-based nanophotonics to the conceptually far-reaching open-system domains where various unusual physical effects take place with manifestation of anti-linear symmetry groups, exceptional-point singularities, topological parametric structures, complex energy-spectral chirality, and associated broadband time-asymmetric operations. We explore, in both theory and experiments, various strongly-interacting open-system configurations provided by optical gains, losses, scattering, radiative inter-modal coupling, and mixed direct/indirect feedback structures.

   Our research aims to establish pioneering subjects pertaining to unexplored territories between non-Hermitian quantum mechanics and conventional nanophotonics technology. Toward this end, we introduce NH dynamics for open quantum systems as a new theoretical tool, explore complex-valued potential configurations realized in photonics systems, potentially discover new NH-photonic properties, and finally establish robust foundations of NH nanophotonic structures and elements as a promising device class for the next generation optical systems in numerous technology areas.