Physics – Condensed Matter – Materials Science
Scientific paper
2006-01-13
J. Opt. Soc. Am. B 23 (10), 2265-2272 (2006)
Physics
Condensed Matter
Materials Science
Revised version after reviewer's comments
Scientific paper
10.1364/JOSAB.23.002265
Quasiperiodic Fibonacci-like and fractal Cantor-like single- and multiple-row nanopillar waveguides are investigated theoretically employing the finite difference time domain (FDTD) method. It is shown that resonant modes of the Fibonacci and Cantor waveguides can have a Q-factor comparable with that of a point-defect resonator embedded in a periodic nanopillar waveguide, while the radiation is preferably emitted into the waveguide direction, thus improving coupling to an unstructured dielectric waveguide located along the structure axis. This is especially so when the dielectric waveguide introduces a small perturbation in the aperiodic structure, breaking the structure symmetry while staying well apart from the main localization area of the resonant mode. The high Q-factor and increased coupling with external dielectric waveguide suggest using the proposed deterministically aperiodic nanopillar waveguides in photonic integrated circuits.
Chigrin Dmitry N.
Kroha Johann
Zhukovsky Sergei V.
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