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Opt Express. 2009 Nov 23;17(24):21465-71. doi: 10.1364/OE.17.021465.

Diffraction engineering of multimode waveguides using computer-generated planar holograms.

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Department of Electro-Optical Engineering, National Cheng Kung University, Tainan, Taiwan.


The self-imaging property in multimode waveguides is related to the waveguide widths and lengths. By engineering the diffraction properties of multimode waveguides, we propose a scheme to design devices with reduced self-imaging lengths at a fixed width. Using computer-generated planar holograms, the coupling coefficients between the guided modes are adjusted to generate the desired diffraction properties. Calculations based on the coupled-mode theory are presented. Devices are designed based on a silicon-on-insulator (SOI) platform. Beam propagation simulations are used to verify the coupled-mode theory analysis.

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