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(a) Band structure of the 2D photonic crystal. The inset shows the PC structure with a square lattice. The black circles represent the dielectric rods (with refractive index of 3.1) placed in air. (b) The projected band structure of the PC waveguide, which is formed by removing one column of rods from the PC, as shown in the inset. The grey regions are the projected pass bands, while the solid line is the dispersion curve of PC waveguide mode.
(a) Photonic crystal structure where the output port of waveguide is opened directly on the PC surface. (b) The proposed structure where a single waveguide port is split into 16 output ports.
(Color online) (a) Intensity distributions of the electric field for the line defect structure shown in Fig. 2(a). (b) The intensity distributions of the electric field for the multiple-output structure shown in Fig. 2(b). Both simulations were done at the frequency , and the and axes are scaled in the PC lattice constant .
(Color online) Comparison of calculated and measured far field radiation patterns (partial) for the designed structure at the frequency . The inset is the full calculated pattern for the same structure and frequency.
(Color online) FWHMs of the calculated and measured radiation patterns for the structure shown in Fig. 2(b) within the frequency range of . The FWHM data of the radiation patterns for 16 coherent point sources are also shown for comparison.
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