We studied plasmonic nanostructures in single-crystal gold with scanning electron and femtosecond photoemission electron microscopies. We designed 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.
Revised: January 21, 2016 |
Published: August 28, 2015
Citation
Gong Y., A.G. Joly, P.Z. El-Khoury, and W.P. Hess. 2015.Efficient Coupling and Transport of a Surface Plasmon at 780 nm in a Gold Nanostructure. In Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, August 9, 2015, San Diego, California. Proceedings of the SPIE, edited by AD Boardman and DP Tsai, 9547, Paper No. 95470H. Bellingham, Washington:SPIE, the International Society for Optics and Photonics.PNNL-SA-111002.doi:10.1117/12.2190449