| 1. |
- Wei, Hong, et al.
(författare)
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Highly tunable propagating surface plasmons on supported silver nanowires
- 2013
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Ingår i: Proceedings of the National Academy of Sciences. - : Proceedings of the National Academy of Sciences. - 1091-6490 .- 0027-8424. ; 110:12, s. 4494-4499
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Tidskriftsartikel (refereegranskat)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 mu m 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.
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| 2. |
- Wei, Hong, et al.
(författare)
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Quantum Dot-Based Local Field Imaging Reveals Plasmon-Based Interferometric Logic in Silver Nanowire Networks
- 2011
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Ingår i: Nano Letters. - : American Chemical Society (ACS). - 1530-6992 .- 1530-6984. ; 11:2, s. 471-475
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Tidskriftsartikel (refereegranskat)abstract
- We show that the local electric field distribution of propagating plasmons along silver nanowires can be imaged by coating the nanowires with a layer of quantum dots, held off the surface of the nanowire by a nanoscale dielectric spacer layer. In simple networks of silver nanowires with two optical inputs, control of the optical polarization and phase of the input fields directs the guided waves to a specific nanowire output. The QD-luminescent images of these structures reveal that a complete family of phase-dependent, interferometric logic functions can be performed on these simple networks. These results show the potential for plasmonic waveguides to support compact interferometric logic operations.
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| 3. |
- Zhang, Zhenglong, et al.
(författare)
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Tip-Enhanced Ultrasensitive Stokes and Anti-Stokes Raman Spectroscopy in High Vacuum
- 2013
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Ingår i: Plasmonics. - : Springer Science and Business Media LLC. - 1557-1963 .- 1557-1955. ; 8:2, s. 523-527
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Tidskriftsartikel (refereegranskat)abstract
- We report ultrasensitive Stokes and anti-Stokes Raman spectra of 1,2-benzenedithiol monolayer on Ag film with home-made high-vacuum tip-enhanced Raman spectroscopy (HV-TERS) system. Raman peaks that were orginally very weak were observed experimentally and assigned theoretically. The local temperature was obtained based on the observed Stokes and anti-Stokes HV-TERS spectra.
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