Bound states in the continuum
Bound states in the continuum are an excellent example of how a solution to a simple problem of quantum mechanics, obtained about a century ago, can serve as an incentive to study the whole spectrum of resonance phenomena in wave physics. Due to the giant radiative lifetime, bound states in a continuum have found many applications in various fields of physics from nanophotonics and quantum mechanics to hydrodynamics and acoustics. Today, bound states in the continuum find many applications for nonlinear optical devices, lasers, and optical biosensors.
Chiral nanophotonics (twisted light, chiral sensing, photonics of SAM)
The electromagnetic field, like mechanical objects, can transfer energy, momentum, and angular momentum. The spin component of the total angular momentum of the electromagnetic field determines the polarization of light and is responsible for spin-polarization effects arising from the interaction of near- and far-fields with photonic nanostructures, for example, unidirectional excitation of surface and guided modes, the optical beam shifts, an optical analog of the spin Hall effect, etc. Polarization- and spin-dependent optical effects are found in almost all areas of science and everyday life.
Nonlinear nanophotonics
Light-light interaction is usually quite weak. One of the matters of nonlinear nanophotonics is the enhancement of this interaction by exploiting resonant photonic nanostructures. This opens up great possibilities for all-optical on-chip devices. Dynamical optical control, spatio-temporal modulation, and structuring of optical pulses can be achieved by using nonlinear and quantum metasurfaces. Such new optical systems are of high importance for a wide range of potential applications, primarily in optical communication lines, information processing systems, and sensors.
Meta-photonics and Mie-tronics
The study of resonant dielectric
nanostructures with large refractive index is a new research direction in nanoscale optics and metamaterial-inspired nanophotonics. Many concepts of all-dielectric resonant nanophotonics are driven by the idea of employing subwavelength dielectric nanoparticles with Mie resonances as
“meta-atoms” for creating highly efficient optical metasurfaces and metadevices. Precise engineering of the optical resonances results in many fascinating phenomena such as perfect reflection, broadband transmission, complete control of phase and polarization, and imaging with subwavelength resolution.
