Plasmonic nanolaser for intracavity spectroscopy and sensorics

摘要

We demonstrate intracavity plasmonic laser spectroscopy using a plasmoniclaser created from a periodically-perforated silver film with a liquid gainmedium. An active zone of the laser is formed by a highly elongated spot ofpumping. This results in an 80x decrease in the threshold pumping level; in asignificantly more efficient diffusive mixing of dye molecules, whichsubstantially suppresses the effect of their bleaching; and in the ability toreduce the volume of the gain medium to as little as 400 nL. We use this designfor a stable plasmonic laser in multiple measurements and demonstrate that itis highly effective as a spaser spectroscopy sensor for intracavity detectionof an absorptive dye at 70 ppb. This work provides an opportunity to developapplications of intracavity plasmonic laser spectroscopy in biological labeldetection and other fields.