Non-Hermitian photonics
Non-Hermitian photonics connects the theory of open resonant systems with the practice of optical and microwave devices, where loss and gain become tools for light control. Our key object of study is exceptional points — spectral features at which the eigenvalues and eigenvectors of a system merge, opening the way to enhanced sensing, topological mode control, and non-standard regimes of radiation generation.
We investigate the manifestation, visualization, and practical use of exceptional points in optical and microwave platforms. Important part of our research covers quantum noise effects and sensing, accounting for the signal-to-noise ratio near exceptional points; direct detection of exceptional points in scattering, transmission, and extinction spectra through analysis of the poles and zeros of the scattering matrix; and coherent perfect absorption with experimental demonstration in dielectric metasurfaces. We separately consider singularities associated with the coalescence of bound states in the continuum and evanescent states, the physics of exceptional points in subwavelength Mie resonators with Fermi-arc features and a nonlinear response, chiral meta-optics based on exceptional points, and stabilization and adaptive tuning of long-range wireless power transfer systems.
Staff
