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(a) A Fourier representation of a dodecagonal structure. Twelve white spots are visible around the origin of the reciprocal space. The distance of two closest neighboring spots in the first circle indicates the basic reciprocal vector . (b) The transmittance spectrum of the dodecagonal structure with the radius of air holes of obtained by using the three-dimensional FDTD method. The refractive index and the slab thickness are 3.4 and , respectively.
(a) Plot of the normalized frequencies of all elementary modes in a PQC single cavity versus the radius of air holes and their magnetic-field profiles (on the right). (b) Typical intensity profiles of the hexapole mode of a triangular photonic crystal lattice (on the top) and a dodecagonal PQC (on the bottom). (c) Plot of the resonant normalized frequency and the quality factor of the PQC hexapole mode versus the radius of nearest-neighbor air holes .
(a) A scanning electron microscope image of the final processed PQC with a distance of , the radius of air holes of , and the radius of nearest-neighbor air holes of . (b) A typical spectrum and curve from photoluminescence experiments.
By adjusting the distance of the lens and the sample, the far-field image (a) and the near-field image (b) were recorded by a CCD camera.
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