Spectral Bandwidth Tuning at Telecommunication Wavelength by Specific Intensity Modulation in Nonlinear Plasmonic Cavity Coupled Waveguide

A single mode plasmonic waveguide coupled to a cavity, filled with third order nonlinear Kerr medium is designed to provide bandwidth tuning at 1.55 mu m. This is achieved by controlling the intensity of a pump beam which modulates the resonance response of the output beam. Usually, the intensity variation causes a shift in the resonance wavelength. However, for certain intensity values of the pump excitation, the system is found to resonate at the same wavelength with varying spectral bandwidths. Quality factor tuning resulting from spectral width variation has been demonstrated quantitatively.