Mode mixing in asymmetric double-trench photonic crystal waveguides

We investigate, both experimentally and theoretically, the waveguiding properties of a double-trench waveguide in which a conventional single-mode strip waveguide is embedded in a two-dimensional photonic crystal (PhC) slab formed in silicon-on-insulator wafers. We demonstrate that the bandwidth for...

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Veröffentlicht in:Journal of applied physics 2004-05, Vol.95 (9), p.4538-4544
Hauptverfasser: Vlasov, Yu. A., Moll, N., McNab, S. J.
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creator Vlasov, Yu. A.
Moll, N.
McNab, S. J.
description We investigate, both experimentally and theoretically, the waveguiding properties of a double-trench waveguide in which a conventional single-mode strip waveguide is embedded in a two-dimensional photonic crystal (PhC) slab formed in silicon-on-insulator wafers. We demonstrate that the bandwidth for relatively low-loss (50 dB/cm) waveguiding is significantly expanded to 250 nm, covering almost all the photonic bandgap owing to nearly linear dispersion of the TE-like waveguiding mode. The flat transmission spectrum, however, is interrupted by numerous narrow stop bands. We found that these stop bands can be attributed to anticrossing between TE-like (positive parity) and TM-like (negative parity) modes. This effect is a direct result of the strong asymmetry of the waveguides that have an upper cladding of air and lower cladding of oxide.
doi_str_mv 10.1063/1.1669051
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title Mode mixing in asymmetric double-trench photonic crystal waveguides
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