Abstract
Deeply etched rib waveguides on silicon on insulator platform were not addressed well in research publications. We have analyzed single mode condition and polarization independence of a deeply etched rib waveguide (DE-RW) structure from biosensing perspective. With this rib structure, an asymmetrically etched integrated optic directional coupler has been numerically modeled to have the same coupling length for quasi-TE and TM modes. The coupling coefficients with the glucose solution as an upper cladding were calculated using a full vector mode solver, and the bulk refractive index sensitivity of the sensor was found as 28.305×10−2/RIU for a fundamental quasi-TE mode.
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Sathish, M., Talabattula, S. Polarization analysis of an asymmetrically etched rib waveguide coupler for sensing applications. Photonic Sens 3, 178–183 (2013). https://doi.org/10.1007/s13320-013-0079-6
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DOI: https://doi.org/10.1007/s13320-013-0079-6