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Title: Efficient Coupling and Transport of a Surface Plasmon at 780 nm in a Gold Nanostructure

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.
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Resource Relation:
Conference: Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, August 9, 2015, San Diego, California. Proceedings of the SPIE, 9547:Paper No. 95470H
AD Boardman and DP Tsai; SPIE, the International Society for Optics and Photonics, Bellingham, WA, United States(US).
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
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Country of Publication:
United States