• Pioneering concept of ‘active plasmonics’ and its application for active control of SPP waves using structural (phase) transformations. In this context, I have numerically demonstrated one of the first designs of the plasmonic switch, experimentally realised the proposed concept and introduced a novel Ga/Al nano-composite nonlinear material.

  • The idea and numerical demonstration of a concept for an ultrasmall integrated nanophotonic modulator, having a size of just 100 nm and utilising a drastic nanoscale electro-optic effect in degenerate semiconductors. It redefines the boundaries of optoelectronics bringing active control of optical signals to the nanoscale and creates a prospective backbone technology for future fully-functional hybrid electronic/photonic devices.

  • Implementation of a hydrodynamic time-domain numerical model describing coherent interactions of free-carrier gas in nanostructured metallic materials of an arbitrary geometry with an optical pulse of an arbitrary temporal profile. For the first time, this approach allows to address in a non-perturbative way the phenomena of multiple and resonantly-enhanced harmonic generation and reveals an interplay between the nonlocal effects and topology of the nanostructure. Furthermore, to describe incoherent Kerr nonlinearity a model taking into account excitation of hot electrons has been developed.

  • Numerical demonstration of an innovative concept of SPP mode amplification via electric injection in metal-semiconductor heterostructures, opening a prospect for on-chip subwavelength data networks with an unmatched bandwidth. Furthermore, on its basis I have demonstrated the design of the first on-chip electrically-pumped coherent SPP source with subwavelength dimensions.

  • Development of a double-modulation pump-probe technique to perform ultra-sensitive optical gain measurements. The technique allowed me to demonstrate all-plasmonic modulation of co-propagating SPP signals at the interface with an Er-based gain medium. Moreover, for the first time I have developed an analytical theory of this process.

  • Computational and experimental demonstration of extremely versatile active plasmonic circuitry on the basis of dielectric-loaded SPP waveguides. This work has had a major impact in the field of nano-optics, already generating 1000+ citations.

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