Abstract
We present cross-talk calculations for a subdiffraction nanophotonic waveguide that consists of a colloidal quantum dot (QD) array in diameter and compare the results with conventional continuous dielectric waveguides, assuming the same size as well as a cutoff diameter for guided mode. We find that the QD cascade has much lower cross talk than dielectric waveguides at an identical separation . Moreover, results for dielectric waveguides at a gap are comparable with those of QD structures spaced apart. Hence the proposed QD device is potentially superior to conventional waveguides in achieving lower cross talk in the subdiffraction regime and provides a new route to achieving high-density photonic integrated circuits.
© 2007 Optical Society of America
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