Phys. Rev. Lett. 90, 057401 (2003) [4 pages]Optical Properties of Gold NanoringsReceived 13 August 2002; published 3 February 2003 The optical response of ring-shaped gold nanoparticles prepared by colloidal lithography is investigated. Compared to solid gold particles of similar size, nanorings exhibit a redshifted localized surface plasmon that can be tuned over an extended wavelength range by varying the ratio of the ring thickness to its radius. The measured wavelength variation is well reproduced by numerical calculations and interpreted as originating from coupling of dipolar modes at the inner and outer surfaces of the nanorings. The electric field associated with these plasmons exhibits uniform enhancement and polarization in the ring cavity, suggesting applications in near-infrared surface-enhanced spectroscopy and sensing. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.057401
DOI:
10.1103/PhysRevLett.90.057401
PACS:
78.67.Bf, 61.46.+w, 73.20.Mf
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.