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Proceedings Paper

Planar waveguide photonic crystals for sensing applications: a general proposal
Author(s): José Rodríguez; Susana Fernández; Miguel García; Diego Pozo
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Paper Abstract

In this work, we demonstrate the possibility of planar waveguide photonic crystals to be used in general sensing proposes. The electromagnetic performance of photonic crystals obtained by connecting in cascade planar optical waveguides with high index contrast was analysed. In our case, the periodicity of the lattice is obtained in the substrate, instead of in the guiding region, as in conventional waveguide photonic crystals. The theoretical model involves a new generalized scattering matrix concept, together with the generalized telegraphist equations formulism and the modal matching technique. The implementation of the pattern waveguide photonic crystals was carried out by connecting abruptly planar optical waveguides. To get the periodic lattice, we use the substrate refractive index as lattice periodic parameter, and the waveguide lengths as lattice constant. Photonic band gaps and photonic windows were obtained. In all cases the power conservation was excellent. If a local defect is introduced in the PBG structure, an on state can be introduced in the gap. The local defect modifies the optical path, so that the PBG is broken, and the on state appears in the PBG interval. Besides, the on state wavelength can be tuned if the optical path of the defect is modified: changing the physical length or/and the refraction index of the defect. In this way, planar waveguide photonic crystals could be used for sensing applications when a specimen modifies refraction index lattice site. Sensing properties of planar waveguide photonic crystals, with single and double sensing channel, are demonstrated.

Paper Details

Date Published: 20 October 2006
PDF: 9 pages
Proc. SPIE 6371, Photonic Sensing Technologies, 63710M (20 October 2006); doi: 10.1117/12.684662
Show Author Affiliations
José Rodríguez, Univ. of Oviedo (Spain)
Susana Fernández, Univ. of Oviedo (Spain)
Miguel García, Univ. of Oviedo (Spain)
Diego Pozo, Univ. of Oviedo (Spain)

Published in SPIE Proceedings Vol. 6371:
Photonic Sensing Technologies
Michael A. Marcus; Brian Culshaw; John P. Dakin, Editor(s)

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