Plasmonic Bowtie Nanolaser Arrays

Plasmonic lasers exploit strong electromagnetic field confinement at dimensions well below the diffraction limit However, lasing from an electromagnetic hot spot supported by discrete, coupled metal nanoparticles (NPs) has not been explicitly demonstrated to date. We present a new design for a room temperature nanolaser based. on three-dimensional (3D) Au, bowtie. NPs supported by an organic gain.. material. The extreme field. compression, and thus ultrasmall mode volume, within the bowtie gaps Produced laser oscillations at the localized plasmon resonance gap mode of the 3D bowties. Transient absorption measurements confirmed ultrafast resonant energy transfer between photoexcited dye molecules and gap plasmons on the picosecond time scale. These plasmonic nanolasers are anticipated to be readily integrated into Si based photonic devices, all optical circuits, and nanoscale biosensors.