Selective suppression of extinction within the plasmon resonance of gold nanoparticles

We present extinction measurements on rectangular two-dimensional arrays of gold nanoparticles on a dielectric waveguide. The spectra exhibit spectral ly narrow bands of suppressed extinction within the particle-plasmon resona nce, resulting from destructive interference between the incident light fie ld and the excited waveguide modes. The dependence of the spectral position of these high-transmission bands on different waveguide modes is investiga ted in detail.