Near/Far-Field Investigations of the Interaction between Surface Waves and Nanoparticles

Abstract

Results of experimental studies of the scattering of electromagnetic surface waves by metal nanoparticles (NPs) located at different distances of a silver film and carried out by both near-and farfield optical techniques are presented for the first time, as far as we know. SNOM and AFM techniques were applied to investigate near-field scattering and topographical images of the outer interface. In the far-field, the half-space distribution of the normalized scattered light intensity has been measured and shows, as well as SNOM, an increase of the scattered intensity with NPs-silver distance. These results can be attributed to the variation of the space distribution of the electric field of the surface wave.

Spacer Layer Effect in Fluorescence Enhancement from Silver Nanowires over a Silver Film; Switching of Optimum Polarization

“…16,17 The substrate might facilitate electronic communication between individual nanostructures and more efficient generation of resonant plasmons, through coupling with the electronic states of each structure simultaneously. 16,18 Tuning of the spacing between the nanostructures and a metallic substrate is also expected to change the coupling between localized plasmon resonances in the former and surface plasmon resonances in the latter. 19,20 In this work, we examine the role of coupling between arrays of fluorescent molecule-coated Ag nanowires and an underlying Ag film in metal nanostructure-enhanced fluorescence.…”

“…In addition, as we reported recently, it is possible the tune the widths of the individual structures within the grating to allow excitation of standing wave surface plasmons, that is, propagating plasmons with opposite k -vectors; also, for certain grating periods a Wood anomaly, leading to light propagating along the interface, can be simultaneously excited. − The substrate can play a large role in the enhancement, particularly if it has a large dielectric response. Fluorescence intensities of up to 350 times the unenhanced value on a bare glass surface have already been observed for Ag nanoparticles on an “active” substrate, and further increased enhancements are theoretically allowed. , The substrate might facilitate electronic communication between individual nanostructures and more efficient generation of resonant plasmons, through coupling with the electronic states of each structure simultaneously. , Tuning of the spacing between the nanostructures and a metallic substrate is also expected to change the coupling between localized plasmon resonances in the former and surface plasmon resonances in the latter. , …”

Ultrafast light scattering imaging of multi-scale transition dynamics in vanadium dioxide

“…Angle-resolved scattering was measured within hemisphere and mapped as a function of polar h and azimuthal u angles and also versus the spatial frequency of surface relief Fourier decomposition. 38 The surface relief can be represented as a superposition of sinusoidal diffraction gratings with different periods d, amplitudes, phases, and orientations, where each grating diffracts light only in two symmetric directions in space [ Fig. 1(b)].…”

Surface wave scattering by a nano-object situated on a surface

“…A large number of works on scattering of the SW by the surface defects were published during the past few years (see, e.g., Refs. [8][9][10][11][12][13][14][15][16]). Complementary aspects of the phenomenon of surface plasmonpolaritons can be clarified with using of the scanning near-field optical microscopy (SNOM) [17,18].…”