Surface enhanced resonance Raman and luminescence on plasmon active nanostructured cavities

Abstract

Presented here are studies of the impact of excitation angle on surface enhanced Raman and luminescence spectroscopy of dye immobilised on a plasmon active nanocavity array support. Results show that both Raman and luminescence intensities depend on the angle of incidence consistent with the presence of cavity supported plasmon modes. Dependence of scattering or emission intensity with excitation angle occurs over the window of observation.

Surface enhanced luminescence and Raman scattering from ferroelectrically defined Ag nanopatterned arrays

“…2(d) shows that the luminescence from the Ag nanopatterned arrays is greater by ca. 20% than the luminescence from the same probe molecule on LiNbO 3 …”

“…Metallic nanostructures made from metals such as silver or gold yield plasmons when light creates a collective oscillation of the conduction electrons on the surface of the metal. [1][2][3][4][5][6][7] The characteristic properties of the plasmonic structures have been found to be greatly dependent on factors such as size, shape, and dielectric environment. [2][3][4][5][6][7] Constructing specific patterns or architectures of plamonic active materials with nanoscale control and feature size is of interest in a variety of plasmonic applications ranging from sensing to enhanced fluorescence.…”

“…[1][2][3][4][5][6][7] The characteristic properties of the plasmonic structures have been found to be greatly dependent on factors such as size, shape, and dielectric environment. [2][3][4][5][6][7] Constructing specific patterns or architectures of plamonic active materials with nanoscale control and feature size is of interest in a variety of plasmonic applications ranging from sensing to enhanced fluorescence. 1,2 Self-assembly is the spontaneous and reversible organization of particulate units (e.g., molecules or nanoparticles) into higher ordered structures, 8,9 which has been applied to produce a wide range of materials with nanometer sized features such as one dimensional quantum wires or zero dimensional quantum dots.…”

“…The samples were illuminated with visible light through a 50Â objective lens, and the Raman scattering signals were collected at a backscattered angle and directed onto a charge coupled device (CCD) via a monochromator. [3][4][5][6][7] The setup for the Raman scattering studies on the PPE sample was with laser power ¼ 25 mW and excitation wavelength k ex ¼ 532 nm.…”

“…The calculations were made in 2D with an electromagnetic (EM) wave incident on the silver from below with an electric field polarized along the nanopattern array. The wave was modified in COMSOL using the dielectric properties of LiNbO 3 . The dielectric properties of silver were obtained from Johnson and Christy.…”