Invited Paper
Dielectric Nanoantennas and Metasurfaces

Dielectric nanoantennas are a new trend in nanophotonics, which becomes competitive to conventional plasmonics in multiple areas of applications. These resonant nanostructures being made of high-refractive index dielectric or semiconductor materials (e.g. silicon) may have superior performance compared to plasmonics due to lower losses and stronger magnetic resonance response. These result from a different mechanism of excitation of the resonant modes based on displacement rather than real currents inside the nanostructures. The presence of both strong magnetic and electric resonances provides a superior scattering directivity due to interference of the two dipole modes, also known as Kerker’s effect. In this talk, I will review several recent results of our team, which demonstrate a huge potential of dielectric nanoantennas for various applications. These will include: (i) experimental demonstration of highly localized magnetic fields in silicon nanodimers; (ii) low-loss light propagation in silicon nanoparticle waveguides, and (iii) highly transparent dielectric metasurfaces having a full 2π control over the phase of incoming light at visible and near-IR wavelengths.

arseniy_k@dsi.a-star.edu.sg