dorsal/arxiv
View SchemaMode mixing in asymmetric double trench photonic crystal waveguides
| Authors | Yu. A. Vlasov, N. Moll, S. J. McNab |
|---|---|
| Categories | |
| ArXiv ID | physics/0312112 |
| URL | https://arxiv.org/abs/physics/0312112 |
| DOI | 10.1063/1.1669051 |
Abstract
e investigate both experimentally and theoretically the waveguiding properties of a novel double trench waveguide where a conventional single-mode strip waveguide is embedded in a two dimensional photonic crystal (PhC) slab formed in silicon on insulator (SOI) wafers. We demonstrate that the bandwidth for relatively low-loss (50dB/cm) waveguiding is significantly expanded to 250nm covering almost all the photonic band gap 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 anti-crossing 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. To our knowledge this is the first demonstration of the effects of cladding asymmetry on the transmission characteristics of the PhC slab waveguides.
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"abstract": "e investigate both experimentally and theoretically the waveguiding\nproperties of a novel double trench waveguide where a conventional single-mode\nstrip waveguide is embedded in a two dimensional photonic crystal (PhC) slab\nformed in silicon on insulator (SOI) wafers. We demonstrate that the bandwidth\nfor relatively low-loss (50dB/cm) waveguiding is significantly expanded to\n250nm covering almost all the photonic band gap owing to nearly linear\ndispersion of the TE-like waveguiding mode. The flat transmission spectrum\nhowever is interrupted by numerous narrow stop bands. We found that these stop\nbands can be attributed to anti-crossing between TE-like (positive parity) and\nTM-like (negative parity) modes. This effect is a direct result of the strong\nasymmetry of the waveguides that have an upper cladding of air and lower\ncladding of oxide. To our knowledge this is the first demonstration of the\neffects of cladding asymmetry on the transmission characteristics of the PhC\nslab waveguides.",
"arxiv_id": "physics/0312112",
"authors": [
"Yu. A. Vlasov",
"N. Moll",
"S. J. McNab"
],
"categories": [
"physics.optics"
],
"doi": "10.1063/1.1669051",
"title": "Mode mixing in asymmetric double trench photonic crystal waveguides",
"url": "https://arxiv.org/abs/physics/0312112"
},
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