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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 11 — May. 23, 2011
  • pp: 10049–10056

Vertical optical antennas integrated with spiral ring gratings for large local electric field enhancement and directional radiation

Baoan Liu, Dongxing Wang, Chuan Shi, Kenneth B. Crozier, and Tian Yang  »View Author Affiliations

Optics Express, Vol. 19, Issue 11, pp. 10049-10056 (2011)

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We propose a device for reproducible achievement of enormous enhancement of local electric field intensities. In each device, a metallic spiral ring grating is employed for efficient excitation of local surface plasmon resonance in the tiny gap of a vertically oriented optical antenna. Radiation from the optical antenna is collimated by the ring grating which facilitates efficient collection. As a numerical example, for a gold nanosphere placed one nanometer above the center of a gold spiral ring grating, our simulations predict an increase in local electric field intensity of up to seven orders of magnitude compared to planewave illumination, and collection efficiencies of up to 68% by an objective with a numerical aperture of 0.7. Single molecule SERS application is discussed.

© 2011 OSA

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(240.6680) Optics at surfaces : Surface plasmons
(240.6695) Optics at surfaces : Surface-enhanced Raman scattering

ToC Category:
Optics at Surfaces

Original Manuscript: February 11, 2011
Revised Manuscript: April 18, 2011
Manuscript Accepted: May 3, 2011
Published: May 9, 2011

Baoan Liu, Dongxing Wang, Chuan Shi, Kenneth B. Crozier, and Tian Yang, "Vertical optical antennas integrated with spiral ring gratings for large local electric field enhancement and directional radiation," Opt. Express 19, 10049-10056 (2011)

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