Journal
PHYSICAL REVIEW B
Volume 72, Issue 12, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.72.125322
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Linear photonic crystal waveguides with different channel widths realized in silicon membranes are investigated by means of attenuated-total-reflectance (ATR) measurements. The dispersion of line-defect modes with both parities with respect to a vertical plane bisecting the waveguide channel is determined, thereby allowing one to distinguish between multimode and single-mode behavior. The presence of a single-mode frequency window in the guided-mode region below the light line is established not only for standard W1 waveguides with channel width w(0)=root 3a (i.e., a missing row of holes in the triangular lattice with lattice constant a), but also for W1.5 waveguides where the channel width is increased to w=1.5w(0). The results agree with theoretical predictions and might be important for the realization of linear photonic crystal waveguides with single-mode behavior and ultralow propagation losses.
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