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Photonic crystal tapers for ultracompact mode conversion
Optics Letters
|December 1, 2007
Summary
We studied coupling light between ridge and photonic crystal waveguides. Optimized photonic crystal tapers achieved over 80% coupling efficiency, showing promise for integrated optics.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Ridge waveguides offer weak light confinement, common in semiconductor lasers.
- Photonic crystal (PC) waveguides provide strong light confinement using periodic structures.
Purpose of the Study:
- To investigate efficient light coupling between ridge and 2D photonic crystal waveguides.
- To compare the performance of various photonic crystal taper designs against classic tapers and butt coupling.
Main Methods:
- Utilized finite-difference time-domain (FDTD) calculations to simulate light propagation.
- Modeled a 2D photonic crystal waveguide with a triangular lattice of air cylinders in AlGaAs.
- Analyzed different photonic crystal taper geometries for optimal coupling.
Main Results:
- Achieved high coupling efficiency exceeding 80% with a 2.5-micrometer-long PC taper.
- Demonstrated superior performance of PC tapers compared to classic tapers and butt coupling.
- Analyzed the impact of PC air-fill factor and alignment tolerances on coupling efficiency.
Conclusions:
- Photonic crystal tapers are highly effective for efficient light coupling from ridge waveguides.
- Optimized PC tapers offer a viable solution for integrated photonic devices.
- The study provides insights into design parameters for maximizing coupling efficiency.
