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(a) A schematic of the strip waveguide to high- photonic crystal waveguide coupling structure. The PCW on the right side of the interface is assumed to support high- propagation at the wavelength of operation. (b) Group index vs wavelength for infinitely long PCW with different defect line widths, . The inset shows band structure for W1 PCW, , slab , , and . The highlighted (green) section is the bandwidth over which .
3D FDTD simulation results for direct coupling of strip waveguide and PC slab waveguide (no taper) and coupling through PCW tapers, with step, linear, parabolic, and split profiles, for , 8, and 16. The lower row graphs were zoomed at the band-edge region.
SEM picture of fabrication PCW butt coupled to strip waveguides: (a) a tilted view showing the silicon slab PCW, (b) 16-period linear taper, (c) 16-period step taper, and (d) interface of step taper with high- PCW.
Measurement results: transmission vs wavelength for direct coupling of strip waveguide and PC slab waveguide (no taper) and coupling through PCW tapers, with step and linear profiles, for and 16. The near band-edge wavelength (slow light region is highlighted).
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