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Properties, applications and fabrication of photonic crystals with ring-shaped holes in silicon-on-insulator |
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| Authors: | A Syntjoki M Mulot K Vynck D Cassagne J Ahopelto H Lipsanen |
| Institution: | aHelsinki University of Technology (TKK), Micro and Nanosciences Laboratory, Micronova, Tietotie 3, FIN-02015 Espoo, Finland;bVTT Information Technology, Micronova, P.O. Box 1208, FIN-02044 VTT, Finland;cGroupe d’Etude des Semiconducteurs, UMR 5650 CNRS, Université Montpellier II, CC074 Place Eugéne Bataillon, 34095 Montpellier Cedex 05, France |
| Abstract: | We show that photonic crystals with ring-shaped holes (RPhCs) exhibit superior properties compared to conventional photonic crystals (PhCs). At low air-fill factors RPhCs can have a larger bandgap than conventional PhCs. Moreover, RPhC waveguides with both high group index and small group velocity dispersion can be designed. RPhC waveguides are also more sensitive to external refractive index changes, which is attractive for sensor applications. Finally we set up a procedure to pattern RPhCs in silicon-on-insulator. |
| Keywords: | Guided waves Integrated optics materials Optical systems design Waveguides Photonic integrated circuits Dispersion Photonic crystals |
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