Fano Resonance in an Electrically Driven Plasmonic Device.

摘要: We present an electrically driven plasmonic device consisting of a gold nanoparticle trapped in gap between two electrodes. The tunneling current the generates plasmons, which decay radiatively. emitted spectrum extends up to energy that depends on applied voltage. Characterization electrical conductance at low temperatures allows us extract voltage drop each tunnel barrier and corresponding spectrum. In several devices we find pronounced sharp asymmetrical dip spectrum, identify as Fano resonance. Finite-difference time-domain calculations reveal this resonance is due interference electrodes dipolar fields can be conveniently controlled by structural parameters.