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(a) Band structure of slotted W1 PhCWG with , , , , and slot width . (b-I,II,III) Field distributions (Left: ; Right: ) of the three modes inside TE band gap.
[(a)–(c)] 2D FDTD simulation of spatial distribution and the value across the air slot for cavity modes created from photonic waveguide mode I, II, and III, respectively.
(a) SEM of the air-slot mode-gap confined cavity. (b) and (c) 3D FDTD simulation and Fourier transform of the electric field for cavity mode due to mode-gap effect of waveguide mode I.
(a) SEM of the air-slot mode-gap confined cavity with in-line coupling waveguide. The base width of a line defect and the width of input/output waveguides is . The distance between the cavity and coupling waveguide is . Large circle (red) indicates the region from which the radiation signals are collected. [(b)–(d)] Radiation spectra of three devices: (b) , , and ; (c) , , and ; (d) , , and .
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