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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 31, Iss. 9 — Sep. 1, 2014
  • pp: 2070–2074

3D confinement of the focal spot of plasmonic Fresnel zone plate lens using gold bowtie nanoantenna

Di Feng  »View Author Affiliations


JOSA A, Vol. 31, Issue 9, pp. 2070-2074 (2014)
http://dx.doi.org/10.1364/JOSAA.31.002070


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Abstract

By using a gold bowtie nanoantenna at the focal plane of a plasmonic Fresnel zone plate lens, we numerically demonstrate that the focused beam spot can be strongly confined in a three-dimensional (3D) region, which means the focal spot will have high axial resolution as well as high lateral resolution. According to the antenna’s resonance spectrum, the Fresnel zone plate lens is designed at the resonance wavelength of the antenna to get the right diffractive efficiency, and then the antenna will be positioned at the focal plane, so the 3D confined focal spot can be achieved with much higher intensity and much smaller spot size along both axial and transverse directions than that of a lens without using antennas.

© 2014 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(140.4780) Lasers and laser optics : Optical resonators
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

History
Original Manuscript: May 22, 2014
Revised Manuscript: July 17, 2014
Manuscript Accepted: August 4, 2014
Published: August 27, 2014

Citation
Di Feng, "3D confinement of the focal spot of plasmonic Fresnel zone plate lens using gold bowtie nanoantenna," J. Opt. Soc. Am. A 31, 2070-2074 (2014)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-31-9-2070

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