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Highly tunable propagating surface plasmons on supported silver nanowires.

ABSTRACT: Surface plasmons, the quanta of the collective oscillations of free electrons at metal surface, can be easily tuned by changing the surrounding dielectric materials, which is well known for metal nanoparticles and metal surfaces, but less is known for one-dimensional metal nanowires. Here, we find an extremely large tunability of surface plasmons on Ag nanowires with a beat period of the near-field distribution pattern increasing by 90 nm per nanometer of Al2O3 coating, or by 16 µm per refractive index unit change in the surrounding medium. Such high sensitivity is crucial to directly control the optical signal distribution for various routing and demultiplexing functions in plasmonic circuits and may pave the way to the development of on-chip ultrasensitive biosensing.

SUBMITTER: Wei H

PROVIDER: S-EPMC3606990 | biostudies-literature | 2013 Mar

REPOSITORIES: biostudies-literature

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Highly tunable propagating surface plasmons on supported silver nanowires.

Wei Hong H Zhang Shunping S Tian Xiaorui X Xu Hongxing H

Proceedings of the National Academy of Sciences of the United States of America 20130304 12

Surface plasmons, the quanta of the collective oscillations of free electrons at metal surface, can be easily tuned by changing the surrounding dielectric materials, which is well known for metal nanoparticles and metal surfaces, but less is known for one-dimensional metal nanowires. Here, we find an extremely large tunability of surface plasmons on Ag nanowires with a beat period of the near-field distribution pattern increasing by 90 nm per nanometer of Al2O3 coating, or by 16 µm per refractiv ...[more]

PMID: 23487763

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