Investigation of defect cavities formed in inverse three-dimensional rod-connected diamond photonic crystals
2015 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD)（2015）
摘要
We report the optical properties of single defects in inverse three-dimensional (3D) rod-connected diamond (RCD) photonic crystal (PhC) cavities by using plane-wave expansion (PWE) and finite-difference time domain (FDTD) methods. By optimizing the dimensions of a 3D inverse RCD PhC, wide photonic band gaps (PBG) are obtained. Optical cavities with resonances in the bandgap arise when point defects are introduced in the crystal. A variety of shapes and locations of single defects are investigated in high-refractive-index contrast (gallium phosphide-air or chalcogenide-air) inverse RCD structures, and Q-factors and mode volumes (V
eff
) of the resonant cavity modes are calculated. By choosing a single sphere defect located at the center of a tetrahedral arrangement, small mode volumes can be obtained. Here, high Q-factors up to 724,000 and cavity mode volumes down to V
eff
<; 0.3(λ/n)
3
have been demonstrated.
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关键词
defect cavities,optical properties,inverse three-dimensional rod-connected diamond photonic crystal cavities,plane-wave expansion,PWE,finite-difference time domain method,FDTD,3D inverse RCD PhC,photonic band gaps,PBG,optical cavities,point defects,single defect shapes,single defect locations,high-refractive-index contrast inverse RCD structures,Q-factors,resonant cavity mode,single sphere defect,tetrahedral arrangement,small mode volumes,cavity mode volumes,C
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