Coupling to surface modes of metal-based photonic crystals

Philip T. Worthing; William L. Barnes

doi:10.1117/12.463870

25 April 2002 Coupling to surface modes of metal-based photonic crystals

Philip T. Worthing, William L. Barnes

Proceedings Volume 4655, Photonic Bandgap Materials and Devices; (2002) https://doi.org/10.1117/12.463870
Event: Symposium on Integrated Optoelectronic Devices, 2002, San Jose, California, United States

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.

Citation Download Citation

Philip T. Worthing and William L. Barnes "Coupling to surface modes of metal-based photonic crystals", Proc. SPIE 4655, Photonic Bandgap Materials and Devices, (25 April 2002); https://doi.org/10.1117/12.463870

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