Dual Polarised Surface Plasmon Coupled Emission Tuning of Rhodamine B on SPR Metal Sensors

Surface plasmon coupled emission steering and emission tuning (SPCET) were demonstrated from metal-dielectric bi-layered structures in Reverse Kretschmann configuration. Rhodamine B dye doped Poly Vinyl Alcohol emissive layer was deposited on top of metal thin films (Silver, gold and copper) to realise bi-layered SPCET sensors. Apart from conventional p-polarised emissions, all sensor chips showed s-polarised emissions as well. These dual polarised emissions indicate a strong correlation between surface plasmon resonance and SPCET. Thickness of the dielectric layer show a major impact on the correlation between surface plasmon resonance and SPCET. Both p- and s- polarised emissions showed spectral narrowing. For thicker dielectrics, a decrease of 42% in the emission peak width was observed for p-polarised modes and was observed to be a constant for all metal sensors.