[en] The results of experimental and theoretical investigation of planar two-dimensional (2D) samples of plasmon structures are presented. The samples represent a 2D lattice of gold nanoparticles embedded in a thin dielectric layer and are studied by atomic force microscopy (AFM) and optical methods. Absorption bands associated with the excitation of various surface plasmon resonances (SPR) are interpreted. It is found that the choice of the mutual orientation of the polarization plane and the edge of the unit cell of the 2D lattice determines the spectral position of the lattice surface plasmon resonance (LSPR) related to the lattice period. It is shown that the interaction of p- and s-polarized light with a 2D lattice of nanoparticles is described by the dipole–dipole interaction between nanoparticles embedded in a medium with effective permittivity. Analysis of the spectra of ellipsometric parameters allows one to determine the amplitude and phase anisotropy of transmission, which is a consequence of the imperfection of the 2D lattice of samples.

[en] We study optical properties of plasmonic 2D nanostructures (metasurfaces) constructed by analogy with Babinet’s principle – combinations of a perforated noble metal thin film and a complementary array of nanodiscs. Despite of large absorption in either the perforated films or the arrays of nanodiscs, the considered metasurfaces were highly reflective. The effect of increased reflectance is attributed to mutual cancellation of electric and ‘magnetic’ dipoles induced in antiphase, thus suppressing absorption; and a spacer in between the dipoles influences the spectral and incidence angle ranges for the effect observation. We show that a chosen metasurface can have an angle- and polarization-independent response in a wide spectral range. (paper)

[en] We demonstrate spectra of slabs of plasmonic 1D nanostructures and show their ability to detect a specific binding of low-density lipoproteins. Optical spectra of the slabs exhibiting a spectrally sharp resonant peak have been analyzed numerically to demonstrate responses of biosensors under study. We show that the sensitivity to biomolecular binding can be considerably increased by utilizing magnetooptical materials as constituent element of plasmonic 1D nanostructures. (paper)