Controlling the interaction between light and gold nanoparticles: Selective suppression of extinction

The interaction of visible light with the particle-plasmon resonance of met allic nanoparticles can be controlled by geometrical arrangement of nanopar ticle arrays. These arrays are placed on a substrate that supports guided m odes in the wavelength range of the particle plasmon. Coupling of this part icle-plasmon resonance to the directly incident light and to the waveguide modes results in almost complete suppression of light extinction within nar row spectral bands due to destructive interference. Variation of the struct ure parameters allows continuous tuning of these high-transmission bands ac ross the particle-plasmon resonance.