Abstract

We present cross-talk calculations for a subdiffraction nanophotonic waveguide that consists of a colloidal quantum dot (QD) array 10nm in diameter and compare the results with conventional continuous dielectric waveguides, assuming the same 10nm size as well as a 200nm cutoff diameter for guided mode. We find that the QD cascade has much lower cross talk than 10nm dielectric waveguides at an identical separation >30nm. Moreover, results for 200nm dielectric waveguides at a 280nm gap are comparable with those of QD structures spaced 110nm 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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