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(a) Line defect structure with a low-index center slot embedded in a photonic crystal slab. (b) Band diagram for a slot photonic crystal waveguide. The thick dashed line is the light line. The gray regions represent the continuum of extended modes. The dotted curve indicates the defect mode. The inset shows the supercell defined in PWE simulation.
(Color online) (a) 3D profile of the transverse electric field amplitude of the quasi-TE mode in a slot photonic crystal waveguide, where , , , slot , defect , , and . (b) Comparison of two-dimensional field amplitude contours between a slot PCW and a single-mode strip waveguide.
(Color online) (a) Optimization of the mode overlap integral between the slot PCW and the multimode section. The integral is calculated as a function of the length of the multimode section or the phase difference of the excited even modes. (b) FDTD simulation results: a series of profiles on the plane imaged at different positions. The MMI coupler begins at and ends at . The inset shows the transmission of the guided quasi-TE mode as a function of the propagation distance.
(a) Scanning electron microscopy top view of a slot PCW integrated with two MMI couplers. The coupling region is enlarged in the inset. (b) Cross-sectionol views of the slot PCW before and after filling SOG. (c) Top panel: enlarged portion of the dispersion diagram for the guided mode. Bottom panel: transmission spectra of a slot PCW with (solid) and without (dashed) the MMI coupler. The spectrum is normalized by the transmission through a reference waveguide.
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