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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 5 — Mar. 5, 2007
  • pp: 2613–2621

Surface-wave interferometry on single subwavelength slit-groove structures fabricated on gold films

F. Kalkum, G. Gay, O. Alloschery, J. Weiner, H. J. Lezec, Y. Xie, and M. Mansuripur  »View Author Affiliations


Optics Express, Vol. 15, Issue 5, pp. 2613-2621 (2007)
http://dx.doi.org/10.1364/OE.15.002613


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Abstract

We apply the technique of far-field interferometry to measure the properties of surface waves generated by two-dimensional (2D) single subwavelength slit-groove structures on gold films. The effective surface index of refraction nsurf measured for the surface wave propagating over a distance of more than 12 μm is determined to be nsurf = 1.016± 0.004, to within experimental uncertainty close to the expected bound surface plasmon-polariton (SPP) value for a Au/Air interface of nspp = 1.018. We compare these measurements to finite-difference-time-domain (FDTD) numerical simulations of the optical field transmission through these devices. We find excellent agreement between the measurements and the simulations for nsurf. The measurements also show that the surface wave propagation parameter ksurf exhibits transient behavior close to the slit, evolving smoothly from greater values asymptotically toward kspp over the first 2–3 μm of slit-groove distance xsg. This behavior is confirmed by the FDTD simulations.

© 2007 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(050.2770) Diffraction and gratings : Gratings
(230.7400) Optical devices : Waveguides, slab
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves
(260.3910) Physical optics : Metal optics

ToC Category:
Optics at Surfaces

History
Original Manuscript: November 30, 2006
Revised Manuscript: February 13, 2007
Manuscript Accepted: February 14, 2007
Published: March 5, 2007

Citation
F. Kalkum, G. Gay, O. Alloschery, J. Weiner, H. J. Lezec, Y. Xie, and M. Mansuripur, "Surface-wave interferometry on single subwavelength slit-groove structures fabricated on gold films," Opt. Express 15, 2613-2621 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-5-2613


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References

  1. Permanent address: Physikalisches Institut, Universit¨at Bonn, Wegelerstrasse 8, 53115 Bonn, Germany.
  2. G. Gay, O. Alloschery, B. Viaris de Lesegno, J. Weiner, and H. Lezec, "Surface wave generation and propagation on metallic subwavelength structures measured by Far-Field Interferometry," Phys. Rev. Lett. 96, 213901-1-4 (2006). [CrossRef]
  3. G. Gay, O. Alloschery, B. Viaris de Lesegno, C. O’Dwyer, J. Weiner and H. J. Lezec, "The optical response of nanostructured surfaces and the composite diffracted evanescent wave model," Nat. Phys. 2, 262-267 (2006). [CrossRef]
  4. H. Raether,Surface Plasmons on Smooth and Rough Surfaces and on Gratings, (Springer-Verlag, Berlin, 1988).
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  6. G. Gay, O. Alloschery, J. Weiner, H. J. Lezec, C. O’Dwyer, M. Sukharev, and T. Seideman, Comment on "The Response of Nanostructured Surfaces in the Near Field,"Nat. Phys. 2, 792 (2006). [CrossRef]
  7. G. Gay, O. Alloschery, J. Weiner, H. J. Lezec, C. O’Dwyer, M. Sukharev, and T. Seideman, "Surface quality and surface waves on subwavelength-structured silver films," Phys. Rev. E 75, 016612-1-4 (2007). [CrossRef]
  8. Y. Xie, A. Zakharian, J. Moloney, and M. Mansuripur, "Transmission of light through slit apertures in metallic films," Opt. Express 12, 6106-6121 (2004). [CrossRef] [PubMed]
  9. Y. Xie, A. Zakharian, J. Moloney, and M. Mansuripur, "Transmission of light through a periodic array of slits in a thick metallic film," Opt. Express 13, 4485-4491 (2005). [CrossRef] [PubMed]
  10. A. Zakharian, J. Moloney, and M. Mansuripur, "Transmission of light through small elliptical apertures," Opt. Express 12, 2631-2648 (2004). [CrossRef] [PubMed]
  11. P. Johnson and R. Christy, "Optical Constants of the Noble Metals," Phys. Rev. B 6, 4370-4379 (1972). [CrossRef]
  12. Present experimental results. Value of nsurf determined from data in the far-zone
  13. Present FDTD simulations. Value of nsurf determined from FDTD simulations in the far-zone
  14. Measurements from Ref. [2] predominantly in the transient near-zone.
  15. Measurements from Ref. [3] predominantly in the transient near-zone.
  16. Value ofnsurf determined from FDTD simulations of Refs. [7, 6] in the far-zone.
  17. H. J. Lezec and T. Thio, "Diffracted evanescent wave model for enhanced and suppressed optical transmission through subwavelength hole arrays," Opt. Express 12, 3629-3651 (2004). [CrossRef] [PubMed]
  18. Y. Xie, A. R. Zakharian, J. V. Moloney, and M. Mansuripur, "Transmission of light through periodic arrays of sub-wavelength slits in metallic hosts," Opt. Express 14, 6400-6413 (2004). [CrossRef]

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