Journal
OPTICS EXPRESS
Volume 16, Issue 21, Pages 17076-17081Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.16.017076
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Funding
- EU-FP6 Marie Curie Fellowship project SLIPPRY
- EU-FP6 Network of Excellence ePIXnet
- Sun Yat-Sen University
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We report on the fabrication and characterization of silicon photonic crystal waveguides completely embedded in silica. These waveguides offer a robust alternative to air-membranes and are fully compatible with monolithic integration. Despite the reduced refractive index contrast compared to the air-membranes, these waveguides offer a considerable operating range of approximate to 10 nm in the 1550 nm window. While the reduced index contrast weakens the perturbations due to surface roughness, we measure losses of 35 +/- 3dB/cm compared to 12 +/- 3 dB/cm for nominally identical air-membranes. Numerical analysis reveals that the difference in loss results from the different mode distribution and group index of the respective waveguide modes. Radius disorder is used as a fitting parameter in the numerical simulations with the best fits found for disorder levels of 1.4 - 1.7 nm RMS, which attest to the high quality of our structures. (C) 2008 Optical Society of America
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