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Directional radiation of Babinet-inverted optical nanoantenna integrated with plasmonic waveguide

Title
Directional radiation of Babinet-inverted optical nanoantenna integrated with plasmonic waveguide
Author
천상모
Keywords
YAGI-UDA ANTENNA; NANOCIRCUITS; LIGHT
Issue Date
2015-07
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v. 5
Abstract
We present a Babinet-inverted optical nanoantenna integrated with a plasmonic waveguide. Using an integrated nanoantenna, we can couple the plasmon guide mode in a metal-insulator-metal (MIM) structure into the resonant antenna feed directly. The resonantly excited feed slot then radiates to free space and generates a magnetic dipole-like far-field pattern. The coupling efficiency of the integrated nanoantenna is calculated as being approximately 19% using a three-dimensional finite-difference time-domain (3D FDTD) simulation. By adding an auxiliary groove structure along with the feed, the radiation direction can be controlled similar to an optical Yagi-Uda antenna. We also determine, both theoretically and experimentally, that groove depth plays a significant role to function groove structure as a reflector or a director. The demonstrated Babinet-inverted optical nanoantenna integrated with a plasmonic waveguide can be used as a "plasmonic via" in plasmonic nanocircuits.
URI
http://www.nature.com/articles/srep11832http://hdl.handle.net/20.500.11754/26458
ISSN
2045-2322
DOI
10.1038/srep11832
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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