Abstract
We analyze the supermodes in multiple coupled photonic crystal waveguides for
long-wavelengths. In the tight-binding limit we obtain analytic results that agree
with fully numerical calculations. We find that when the field flips sign after a
single photonic crystal period, and there is an odd number of periods between
adjacent waveguides, the supermode order is reversed, compared to that in
conventional coupled waveguides, generalizing earlier results obtained for two
coupled waveguides.
©2006 Optical Society of America
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