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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 31, Iss. 2 — Feb. 1, 2014
  • pp: 302–310

Analysis and design of a cross dipole nanoantenna for fluorescence-sensing applications

J. L. Stokes, Y. Yu, Z. H. Yuan, J. R. Pugh, M. Lopez-Garcia, N. Ahmad, and M. J. Cryan  »View Author Affiliations


JOSA B, Vol. 31, Issue 2, pp. 302-310 (2014)
http://dx.doi.org/10.1364/JOSAB.31.000302


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Abstract

This paper introduces the novel concept of a cross dipole nanoantenna for use in fluorescence based sensing applications. The dual-arm nature of the cross nanoantenna allows a dual resonant structure to be designed such that the shorter arm resonates with the pump wavelength and the longer arm with the emission wavelength. This is expected to further enhance emission from any fluorescent molecule that can couple to both nanoantenna arms when compared with a singly resonant structure. The paper uses the finite-difference time-domain method to first analyze the two-arm nanoantenna case and then shows how intensity enhancement depends on the antenna geometry and tapering of arms in the antenna gap. The results show that smaller gap sizes always produce larger enhancement compared with lightning rod effects due to tapering. A four-arm cross nanoantenna is then studied, highlighting differences from the two-arm case. Finally, the effect of a diagonally aligned molecule transiting the central gap region is studied. The results show that two hotspots occur on either side of the central gap region when the molecule is aligned perpendicular to the transit direction and only a single central hotspot occurs when the alignment is parallel to the transit direction.

© 2014 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.5740) Physical optics : Resonance
(160.4236) Materials : Nanomaterials
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(250.5403) Optoelectronics : Plasmonics
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Materials

History
Original Manuscript: September 19, 2013
Manuscript Accepted: November 5, 2013
Published: January 23, 2014

Citation
J. L. Stokes, Y. Yu, Z. H. Yuan, J. R. Pugh, M. Lopez-Garcia, N. Ahmad, and M. J. Cryan, "Analysis and design of a cross dipole nanoantenna for fluorescence-sensing applications," J. Opt. Soc. Am. B 31, 302-310 (2014)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-31-2-302


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