title: Adiabatic bends in surface plasmon polariton band gap structures.
abstract: Propagation and interaction of surface plasmon polaritons (SPPs) excited in the wavelength range 700-860 nm with periodic triangular arrays of gold bumps placed on gold film surfaces are investigated using a collection near-field microscope. We observe the inhibition of SPP propagation into the arrays within a certain wavelength range, i.e., the band gap (BG) effect. We demonstrate also the SPP propagation along a 30 degrees bent channel obtained by an adiabatic rotation of the periodic array of scatterers. Numerical simulations using the Lippmann-Schwinger integral equation method are presented and found in reasonable agreement with the experimental results.
authors.forename: Ilya P
authors.initials: IP
authors.lastname: Radko
authors.forename: Thomas
authors.initials: T
authors.lastname: Søndergaard
authors.forename: Sergey I
authors.initials: SI
authors.lastname: Bozhevolnyi