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Proceedings Paper

Coupling to surface modes of metal-based photonic crystals
Author(s): Philip T. Worthing; William L. Barnes
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Paper Abstract

Metals form interesting 2-D photonic crystal structures due to their ability to support surface plasmon modes. Recent research has highlighted the potential of photonic crystal concepts to control these modes, in particular due to the sub-wavelength confinement of their fields. We have already demonstrated that a full photonic bandgap for surface plasmons can be achieved through periodic nano-structuring of the surface. Using similar techniques photonic bandgap waveguides for surface plasmons have recently been reported, confirming the viability of metal based photonic crystal surfaces. To utilize these photonic crystal surfaces it is vital that one can efficiently couple radiation both into and out of the surface plasmon mode. Owing to the intrinsic loss of metals such coupling must take place over short distances if it is to prove effective. We have fabricated a metallic photonic crystal surface specifically to explore the efficiency of this coupling. We will show that efficient coupling can be achieved for all surface plasmon propagation directions. Further, for the structures we examined we found that surface plasmon coupling efficiency to radiation was typically 70%. We have also measured the propagation distance required for such coupling, and will discuss the implications our results have for photonic crystal devices based on metallic surfaces.

Paper Details

Date Published: 25 April 2002
PDF: 9 pages
Proc. SPIE 4655, Photonic Bandgap Materials and Devices, (25 April 2002); doi: 10.1117/12.463870
Show Author Affiliations
Philip T. Worthing, Univ. of Exeter (United Kingdom)
William L. Barnes, Univ. of Exeter (United Kingdom)

Published in SPIE Proceedings Vol. 4655:
Photonic Bandgap Materials and Devices
Ali Adibi; Axel Scherer; Shawn-Yu Lin, Editor(s)

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