Tuning the propagation constant by the anti-crossing bandgap prism coupling technique
A novel plasmonic structure based on an anticrossing bandgap prism coupling technique is proposed. The study has been carried out using photonic crystals based on diffraction gratings (bounded by dielectrics with identical dielectric functions) together with a high refractive index prism to couple the long-range surface plasmon polaritons to photons. We analyse the structure and demonstrate the ability for tuning the propagation constants of plasmon modes by changing the thickness of the gold grating. The comparison to non-bandgap techniques is studied, and the influence of the plasmonic configuration on the plasmon propagation constant is discussed as well. Experimental measurements were also carried out to confirm the validity of our model.
Chulia-Jordan, Raquel Santamaría Pérez, David 2012 Tuning the propagation constant by the anti-crossing bandgap prism coupling technique. Plasmonics 7 665 675