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O: Fachverband Oberflächenphysik

O 7: Plasmonics and Nanooptics I

O 7.6: Talk

Monday, March 11, 2013, 11:45–12:00, H31

Tunable Nano-Cavities as optical antennas for near-field scanning probes — •Heiko Groß, Michail Kromm, and Bert Hecht — Experimental Physics 5, University of Würzburg, Germany

Plasmon resonances of nanoslit cavities at the edge of single crystalline gold flakes are experimentally characterized. Controlling the length of the slits created by focused ion beam milling enables us to tune the plasmon resonance through the visible wavelength range while still maintaining highly confined fields within the gap. Unidirectional emission is also observed from the open end of the cavity.

Exploiting the mechanical rigidness of gold flakes makes it possible to use these cavities as a scanning probe with an optical antenna to enhance the emission of single molecules at spatial resolutions well beyond the diffraction limit.