Giant enhancement of elastic surface plasmon-polariton scattering

Abstract

Here we report the first (as far as we know) experimental observation of extremely high enhancement factor due to elastic surface plasmon-polariton scattering by surface singularities.We have observed strong diffraction of surface plasmon-polaritons by shallow diffraction grating while its illumination by evanescent or volume waves do not shows any traces of diffraction structure in space distribution of scattered light.

Nanophysics and Antiviral Therapy

“…Lashkaryov Institute of Semiconductor Physics of the National Academy of Sciences of Ukraine (Kyiv), the D.K. Zabolotnyi Institute of Microbiology and Virology of the NAS of Ukraine (Kyiv), and the Institute of High Technologies of the Taras Shevchenko National University of Kyiv [49,53,59,77]. The main idea of this activity consists in the application of the local field enhancement effect, which is inherent only in nano-objects and can manifest itself in the system nanoparticle-virus.…”

“…Hence, if a surface plasmon-polariton propagates under this surface, the latter plays the role of a quasi-one-dimensional photonic crystal. The previous researches testified that the local field near the edges of nanostrips can reach rather high values [59,60]. Suppose that a biological fluid -e.g., blood consisting of rather large (of the order of several microns) organellas and dissolved nanoparticles (viruses, the dimensions of which are smaller than the structure period, or nanoparticles used for antiviral therapy) -flows over this surface.…”

Analysis of the extreme scattering effect for particles inside and above a noble metal film via the discrete sources method

“…The approximate solution for the S-polarized excitation can be constructed in a similar way. Taking into account that the Fourier harmonics for the exciting plane wave can be written in the form e 0 3(m) = {e 0,S mρ (q) sin(m + 1)ϕ; e 0,S mϕ (q) cos(m + 1)ϕ; e 0,S mz (q) sin(m + 1)ϕ}; h 0 3(m) = {h 0,S mρ (q) cos(m + 1)ϕ; h 0,S mϕ (q) sin(m + 1)ϕ; h 0,S mz (q) cos(m + 1)ϕ}; (10) and the following electric and magnetic vector potentials corresponding to the multipoles are used:…”

“…The EOT in subwavelength hole arrays can be understood as a resonance wave phenomenon caused by excitation of surface plasmon polaritons on both surfaces of the metal film being coupled by vias. The study of transmission through subwavelength apertures is especially important for practical applications in high-resolution optical lithography and high-density optical data storage [9][10][11][12]. An electromagnetic field enhancement that occurs under the surface plasmon excitation in metallic nanoparticles deposited on a semiconductor surface could be used for increasing the optical absorption within semiconductor solar cells for better photocurrent response [13,14].…”

Interaction between viral particles and structured metal surface under surface plasmon propagation

“…On the other hand, it is well known that the strong local fields are formed at the edge of the nano-stripe structures at the surface, along which the surface electromagnetic waves propagate [12,13]. If the nanostripes are situated alongside each other and not so far (several tens of nanometers), the small nanoparticles (like viruses) can be adsorbed at the edges of the stripes (at the edges of the nanocylinders).…”