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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 4 — Apr. 1, 2012
  • pp: 594–599

Near-field optical resonance and enhancement of a plasmonic nanocrescent cylinder tuned by a proximal plasmonic nanostructure

G. V. Pavan Kumar  »View Author Affiliations


JOSA B, Vol. 29, Issue 4, pp. 594-599 (2012)
http://dx.doi.org/10.1364/JOSAB.29.000594


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Abstract

Sharp geometrical features in crescent-shaped plasmonic nanostructures facilitate electromagnetic hot spots that can be harnessed for sensitive detection of molecules and nanomaterials. For a given geometry of nanocrescent cylinder, the near-field optical resonance and enhancement are constants. It is desirable to tune this resonance and enhancement without altering the geometry of the nanocrescent cylinder. Herein, we numerically show how the near-field resonance and enhancement at the tip of a nanocrescent cylinder can be proximally tuned by incorporating a plasmonic nanostrip in the vicinity. Geometrical parameters, such as the nanocrescent cylinder–nanostrip distance (g) and length (l) of the nanostrip, were varied to tune the near-field optical properties. Our analysis revealed (i) an increment in near-field enhancement at the tip of the nanocrescent cylinder in the presence of a plasmonic nanostrip; (ii) a redshift in the dipolar plasmon mode accompanied by an increase in the near-field enhancement by decreasing g and increasing l, independently; and (iii) variation in the near-field enhancement of plasmonic modes as a function of the excitation angle. Such tunable plasmonic configurations offer capabilities to design wavelength-tuned optical devices without altering the base geometry.

© 2012 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(250.5403) Optoelectronics : Plasmonics
(240.6695) Optics at surfaces : Surface-enhanced Raman scattering

ToC Category:
Surface Plasmons

History
Original Manuscript: October 4, 2011
Revised Manuscript: November 24, 2011
Manuscript Accepted: December 22, 2011
Published: March 12, 2012

Citation
G. V. Pavan Kumar, "Near-field optical resonance and enhancement of a plasmonic nanocrescent cylinder tuned by a proximal plasmonic nanostructure," J. Opt. Soc. Am. B 29, 594-599 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-4-594

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