| DOI | Resolve DOI: https://doi.org/10.1117/12.2017077 |
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| Author | Search for: Ctyroký, Jirí; Search for: Kwiecien, Pavel; Search for: Richter, Ivan; Search for: Cheben, Pavel1ORCID identifier: https://orcid.org/0000-0003-4232-9130 |
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| Affiliation | - National Research Council of Canada. Information and Communication Technologies
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| Format | Text, Article |
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| Conference | Integrated Optics: Physics and Simulations, April 17-18, 2013, Prague |
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| Subject | Bloch modes; optical waveguide theory; photonic nanowires; silicon-on-insulators; subwavelength grating waveguides; tapers; integrated optics; modal analysis; nanowires; numerical models; refractive index; reliability analysis; silicon; waveguide couplers; saveguides |
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| Abstract | Subwavelength grating (SWG) waveguides offer the freedom of (effective) refractive index variation in the design of integrated optical components and devices in silicon-on-insulator waveguides without significantly increasing fabrication complexity. An SWG waveguide is formed by a subwavelength (quasi)-periodic structure consisting of short segments of silicon embedded into a lower-index superstrate. As a result, to the first approximation, the SWG waveguide behaves as a channel waveguide with its core refractive index determined by the filling factor of silicon in the superstrate. By changing the filling factor, i.e., the duty-cycle of the SWG structure, its (effective) refractive index can be varied essentially between that of the superstrate and that of silicon. Here we present a numerical analysis of light coupling between a conventional silicon nanowire waveguide and a periodic SWG waveguide by means of a tapered SWG coupler. The coupler function is to facilitate the smooth and low-loss transition from a conventional mode of a photonic nanowire to a Bloch mode of a periodic SWG waveguide, both propagating with different group velocities. To increase the reliability of numerical simulations, two independent 3D numerical codes based on different formulations of a Fourier modal method (FMM) are used for the analysis. Results of modeling of tapered SWG couplers of different lengths confirm excellent optical properties of these couplers, including very low coupling and return losses. |
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| Publication date | 2013 |
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| Publisher | SPIE |
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| In | |
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| Series | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21270680 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 2e5a2bac-0d52-46be-a3a8-5e181ffcb14d |
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| Record created | 2014-02-17 |
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| Record modified | 2020-04-22 |
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