Anomalies in light scattering
Deep insight into the basics of scattering theory and understanding the peculiar features of electromagnetic/light scattering is essential for modern technology. A broad spectrum of exceptional scattering phenomena attainable in suitably engineered structures has recently been predicted and demonstrated, including bound states in the continuum (BIC), exceptional points in PT-symmetrical non-Hermitian systems, coherent perfect absorption, virtual perfect absorption, anapole, cloaking and nontrivial lasing. We have been actively working on unusual scattering phenomena and their applications.
We have been investigating strong light-matter interactions of metamaterials and nanostructures with novel quantum materials: atomically thin van der Waals nanomaterials, 2D semiconductors, quantum dots, topological insulators. We design metamaterials and nanostructures to enhance intrinsically weak responses of quantum materials for advanced quantum, photonic and optoelectronic technologies.
Unlike conventional optical elements with thicknesses of several wavelengths, metalenses and other metadevices are composed of resonant dielectric and metallic nanoantennas with the size of a few tens of nanometres packed with a subwavelength granularity. Such metadevices hold a great promise of effective control over the phase and amplitude of light through the geometric-phase approach rather than by phase retardation upon light transmission. We have been developing functional metadevices for imaging, microscopy and spectroscopy applications capable of controlling wavefronts, polarization, and other light characteristics. We have also been actively working on dynamically tunable metadevices required for most photonic applications.
Classic measurement strategies are approaching their maximum resolution and sensitivity in many areas. However, these levels are often still far from the extreme limits allowed by the laws of physics. It is necessary to adopt strategies that consider the quantum nature of light and matter and optimize their interactions for the desired application. We are developing new approaches that use quantum effects and scattering anomalies for optical measurements beyond classical limits.
Wireless power transfer—the transmission of electromagnetic energy without physical connectors such as wires or waveguides—typically exploits electromagnetic field control methods that were first proposed decades ago and requires some essential parameters (such as efficiency) to be sacrificed in favor of others (such as stability). We have been actively working on novel approaches to electromagnetic field manipulation, including coherent perfect absorption, parity-time symmetry, and exceptional points, etc., and the use of metamaterials and metasurfaces for superb wireless power transfer systems.
Quantum and optical sensors