Journal
NANO LETTERS
Volume 9, Issue 12, Pages 4383-4386Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl902651e
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Funding
- NSFC [10625418, 10874233]
- MOST [2006DFB02020, 2007CB936800, 2009CB930700]
- CAS
- Robert A. Welch foundation [C-1222]
- National Science Foundation [CNS-0421109]
- U.S. Army Research Office [W911NF-04-1-0203]
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Thin metallic nanowires are highly promising candidates for plasmonic waveguides in photonic and electronic devices. We have observed that light from the end of a silver nanowire, following excitation of plasmons at the other end of the wire, is emitted in a cone of angles peaking at nominally 45-60 degrees from the nanowire axis, with virtually no light emitted along the direction of the nanowire. This surprising characteristic can be explained in a simple picture invoking Fabry-Perot resonances of the forward- and back-propagating plasmons on the nanowire. This strongly angular-dependent emission is a critical property that must be considered when designing coupled nanowire-based photonic devices and systems.
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