We study plasmonic nanostructures in single-crystal gold with scanning electron and femtosecond photoemission electron microscopies. We design an integrated laser coupling and nanowire waveguide structure by focused ion beam lithography in single-crystal gold flakes. The photoemission results show that the laser field is efficiently coupled into a propagating surface plasmon by a simple hole structure and propagates efficiently in an adjacent nano-bar waveguide. A strong local field is created by the propagating surface plasmon at the nano-bar tip. A similar structure, with a decreased waveguide width and thickness, displayed significantly more intense photoemission indicating enhanced local electric field at the sharper tip.
The alert did not successfully save. Please try again later.
Yu Gong, Alan G. Joly, Patrick Z. El-Khoury, Wayne P. Hess, "Efficient coupling and transport of a surface plasmon at 780 nm in a gold nanostructure," Proc. SPIE 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, 95470H (28 August 2015); https://doi.org/10.1117/12.2190449