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Kurs, André; Joannopoulos, John D; Soljačić, Marin; Johnson, Steven G
Optics express, 2011-Jul-04, 2011-07-04, 20110704, Letnik: 19, Številka: 14Journal Article
We present numerical experiments showing how coupled-mode theory can be systematically applied to join very dissimilar photonic crystal waveguides with 100% transmission. Our approach relies on appropriately tuning the coupling of the evanescent tail of a cavity mode to each waveguide. The transition region between the waveguides may be as short as a few lattice spacings. Moreover, this technique only requires varying a small number of parameters (two for each waveguide in our example) and the tuning to each waveguide may be done separately, greatly simplifying the computations involved.
