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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 13 — Jun. 23, 2008
  • pp: 9601–9613

Engineering the dielectric function of plasmonic lattices

Amit Agrawal, Z. Valy Vardeny, and Ajay Nahata  »View Author Affiliations


Optics Express, Vol. 16, Issue 13, pp. 9601-9613 (2008)
http://dx.doi.org/10.1364/OE.16.009601


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Abstract

We have systematically measured ε(ω) of subwavelength aperture arrays fabricated in metal films as a function of aperture size and incidence angle using terahertz time-domain spectroscopy. This approach simultaneously yields both the real and imaginary ε(ω) components, enabling deeper insight into the underlying mechanism of the ‘enhanced optical transmission’ (EOT) phenomenon. For random aperture arrays we find that ε(ω) has a plasma response, with an effective plasma frequency that is determined by the waveguide mode cutoff frequency of the individual apertures. However ε(ω) in plasmonic lattices is strongly modulated at discrete resonant frequencies that correspond to the reciprocal vectors in the structure factor that are superposed on the plasma envelope response and appear as dips in the EOT spectrum. The existence of a sum rule for the discrete resonance oscillator strengths when the aperture size or incidence angle are changed validates our approach and allows for engineering of the individual resonances in the EOT spectrum.

© 2008 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves
(260.3090) Physical optics : Infrared, far
(160.1245) Materials : Artificially engineered materials
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optics at Surfaces

History
Original Manuscript: May 2, 2008
Revised Manuscript: June 9, 2008
Manuscript Accepted: June 9, 2008
Published: June 13, 2008

Citation
Amit Agrawal, Z. V. Vardeny, and Ajay Nahata, "Engineering the dielectric function of plasmonic lattices," Opt. Express 16, 9601-9613 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-13-9601


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