Noble Metal Nanostructures Influence of Structure and Environment on Their Optical Properties

Abstract

Optical properties of nanostructured materials, isolated nanoparticles, and structures composed of both metals and semiconductors are broadly discussed. Fundamentals of the origin of surface plasmons as well as the surface plasmon resonance sensing are described and documented on a number of examples. Localized plasmon sensing and surface-enhanced Raman spectroscopy are subjected to special interest since those techniques are inherently associated with the direct application of plasmonic structures. The possibility of tailoring the optical properties of ultra-thin metal layers via controlling their shape and morphology by postdeposition annealing is documented. Special attention is paid to the contribution of bimetallic particles and layers as well as metal structures encapsulated in semiconductors and dielectrics to the optical response. The opportunity to tune the properties of materials over a large scale of values opens up entirely new application possibilities of optical active structures. The nature of surface plasmons predetermines noble metal nanostructures to be promising great materials for development of modern label-free sensing methods based on plasmon resonance—SPR and LSPR sensing.

Effect of Ag Ion Implantation on SPR of Cu-C60 Nanocomposite Thin Film

“…Further increase in fluence, the same band becomes narrow (∼630 nm) with a blue shift of 20 nm. This shifting in SPR peak may be due to change in refractive index of fullerene C 60 matrix [43], as explained by Raman spectroscopy analysis that fullerene C 60 starts converting into amorphous carbon at this fluence. The energy position of the SPR peak can be predicted by using the following equation of Mie theory [21].…”

Scattering of light on rippled surfaces

“…Lysanov [14] proposed a theory of wave scattering on the periodic relief with an arbitrary ratio of the wavelength and spatial nonuniformity period, while Leporskii [15] verified the theoretical results [14] for the case of scattering of sound waves. Particu larly, it was shown that the angular position of diffrac tion maxima is described well by the formula (1) Here, ψ i is the incidence angle, ψ s is the reflection angle, and m is the order of the diffraction maximum. The authors of [16,17] proposed to consider a model of the scale limited fractal transfer surface, which is the linear combination of periodic functions of the form (2) as a scattering surface.…”

“…are formed by the effect of the laser radiation, ion bombardment, application of the mechanical load, and using electro chemical technologies [1][2][3][4][5][6][7][8][9][10]. These structures are interesting for using in optics, fracture and deforma tion physics, mechanics of continuous media, and in heterocatalysis.…”

Influence of stabilizing agent and synthesis temperature on the optical properties of silver nanoparticles as active materials in surface plasmon resonance (SPR) biosensor

“…These particles are under active research because they posses interesting physical properties differing considerably from that of the bulk phase [3][4][5]. It comes from small sizes and the ratio of surface and volume is very large [6].…”