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Abstract
We propose a nanometer-scale hollow core waveguide that can be fabricated with standard methods on a silicon-on-insulator substrate. High optical confinement in the core is possible, making such a waveguide structure suitable for sensing applications, applications making use of strong optical nonlinearities, and optofluidics applications. We extend a historical method (Marcatili's method) to provide analytical solutions for field distributions in the device and simulate power confinement, intensity, and parametric dependencies with beam propagation and finite-difference time-domain methods for two polarizations. In an example worked out, the optical confinement in the air core is ̃40% of the total waveguide power, which is favorable to that of a standard slot waveguide. The intensity per μm2 in the hollow core is 95% higher than in the silicon cladding region, indicating that avoiding optical nonlinearities is also possible. © 2010 Optical Society of America.
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Source Title
Journal of the Optical Society of America B: Optical Physics
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Date
2010-10-01
DOI
10.1364/JOSAB.27.001937
Type
Article