Site selective surface enhanced Raman on nanostructured cavities

Abstract

Presented here are angle dependence studies on the surface enhanced Raman (SER) signal obtained from dye placed on plasmon active nanocavity arrays. A comparative study was carried out between two modified array supports. One array had dye placed only on the interior walls of the cavities in the array. The other array had dye placed only on its top flat surface. Results show that Raman intensities as a function of angle depend on the location of the dye on the array; this was interpreted to arise from the presence of different plasmon polariton modes in these sites.

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

“…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.…”

Photoreduction of SERS-Active Metallic Nanostructures on Chemically Patterned Ferroelectric Crystals

“…Plasmons can be excited on silver nanostructures when light creates a collective oscillation of the conduction electrons on the surface of the metal. [37][38][39] Figure 5a shows SERS of the target molecule, 4-aminothiophenol, which was assembled onto the Ag nanowire array. Only Raman bands below ~ 1000 cm -1 can be accounted for by LN.…”

Surface-enhanced Raman scattering from small numbers of purified and oxidised single-walled carbon nanotubes

“…Raman spectroscopy provides not only information on the defects but also a wealth of further information on SWCNTs. In surface enhanced Raman scattering (SERRS) the Raman signal of SWCNTs can be enhanced by up to 14 orders of magnitude [12][13][14]. This enables small numbers of nanotubes to be probed down to the single nanotube level [12,13,15].…”