Surface‐Plasmon‐Coupled Emission of Rhodamine 110 in a Silica Nanolayer

Abstract

The first observation of strong directional surface-plasmon-coupled emission (SPCE) of Rhodamine 110 in silica nanofilms deposited on silver nanolayers is reported. The preparation of the material is described in detail. The intensity of SPCE exceeds 10 times that of free space fluorescence and total linear light polarization in the SPCE ring is observed. A new experimental setup and an original data collection method is presented. Our material completely preserves its fluorescence properties for at least eight months.

Surface Plasmon-Coupled Emission of Rhodamine 110 Aggregates in a Silica Nanolayer

“…This procedure has been described in detail. 6 SPCE and F-SE were measured with the SPCE spectrofluorometer designed and constructed in our laboratory (Figure 1a). Similar setup was presented in other papers.…”

“…Previously, it has been found that hybrid matrix forms a friendly environment for effective SPCE observation. 6 The change in the profile of absorption spectrum evidence the aggregation process developing with the increase in dye concentration. In the case of less concentrated samples (C R110 ≤ 0.002 M) the presence of higher order aggregates in silica nanolayers can be neglected, and it can be assumed that the analyzed system consists only of monomers and dimers.…”

“…The use of a hemispherical prism results in the formation of SPCE sharp color rings observed in the detector plane (Figure 1b). This directional character and total linear polarization (p and s type 6 ) of SPCE results from a nearfield interaction between the excited fluorophore and surface plasmons. It should be stressed that SPCE contains usually identical spectral information as the free-space emission (F-SE), but unlike normal fluorescence, it can be much more effectively collected.…”

Detection of Cd<sup>2+</sup> Ions Using Surface Plasmon Coupled Emission on Engineered Silver-α Nano Alumina Thin Film Hybrids

“…This phenomenon has been used to develop sensing platforms promising far superior sensitivity and signal collection efficiency (>50% signal detection efficiency), in comparison to conventionally used detection methods such as fluorescence which is an isotropic phenomenon (<1% signal detection efficiency) [2][3][4]. Such platforms have already been used for the successful detection and sensing of many analytes both of biological and chemical in origin [5][6][7][8][9]. SPCE is a polarization dependent phenomenon where, only p-polarized incident light leads to the generation of the surface plasmons on the metal surface.…”

Plasmon enhanced fluorescence of a bisphthalonitrile-based dye via a dopamine mediated interfacial crosslinking reaction on silver nanoparticles

“…19 With respect to the dielectric space layer, the materials involved in majority of published work are inert silica shell, [20][21][22] polyelectrolyte multilayers obtained by layer-by-layer (LBL) technique, 23,24 polymers, 25,26 or prototypical biomolecules (D-biotin, complementary DNA or streptavidin pairs). 27,28 Although the local distance between plasmonic nanostructures and uorophores can be controlled by using these space layers, the attachment of uorophores on the surface of plasmonic structures is either difficult, time consuming or unstable as uorophores are basically incorporated with plasmonic nanostructures via non-covalent interaction or physical adsorption methods, [29][30][31] which would inevitably limit the practical application of PEF in harsh conditions (e.g. high temperature, strong acid medium, etc.)…”