期刊
PHYSICAL REVIEW B
卷 81, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.245321
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资金
- National Sciences and Engineering Research Council of Canada
- Canadian Foundation for Innovation
We introduce a theory to describe disorder-induced scattering in photonic crystal waveguides, specifically addressing the influence of local field effects and scattering within high-index-contrast perturbations. Local field effects are shown to increase the predicted disorder-induced scattering loss and result in significant resonance shifts of the propagating waveguide mode. Performing an incoherent averaging calculation, we demonstrate that two types of frequency shifts can be expected, a mean frequency shift and a rms frequency shift both acting in concert to blueshift and broaden the nominal band structure. The disorder-induced broadening is found to increase as the propagation frequency approaches the slow-light regime (mode edge) due to restructuring of the electric-field distribution. These findings shed new light on why it has hitherto been impossible to observe the very slow-light regime for photonic-crystal waveguides and suggest that the nominal slow-light mode edge may not even exist.
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