Thin Shallow-Ridge Silicon-on-Insulator Waveguide Transitions and Tapers

We analyze transitions from low-loss "magic" width to strongly radiating "anti-magic" width thin, shallow-ridge silicon-on-insulator waveguides operating in the transverse magnetic mode, using a vector eigenmode expansion method. It is shown that the transition produces a beam of...

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Bibliographic Details
Published in:IEEE photonics technology letters 2013-01, Vol.25 (2), p.163-166
Main Authors: Dalvand, N., Nguyen, T. G., Koch, T. L., Mitchell, A.
Format: Article
Language:English
Subjects:
Apertures
Electric fields
Leaky wave antenna
Optical waveguides
Silicon on insulator technology
silicon-on-insulator (SOI) waveguides
Slabs
vector eigenmode expansion method
Waveguide transitions
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Summary:We analyze transitions from low-loss "magic" width to strongly radiating "anti-magic" width thin, shallow-ridge silicon-on-insulator waveguides operating in the transverse magnetic mode, using a vector eigenmode expansion method. It is shown that the transition produces a beam of transverse electric (TE) radiation with a pattern, which is strongly dependent on the geometry of the transition. It is shown that controlled, highly coherent, and low-divergence TE beam can be emitted from a relatively compact linear taper. Methods for side lobe suppression are also analyzed and avenues for more sophisticated beam shaping are identified drawing inspiration from leaky wave antennas.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2012.2230620