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arXiv · 1610.09954

Modelling Defect Cavities Formed in Inverse Three-Dimensional Rod-Connected Diamond Photonic Crystals

M. P. C. Taverne·Y. -L. D. Ho·X. Zheng·S. Liu·L. -F. Chen·M. Lopez-Garcia·J. G. Rarity
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Abstract

Defect cavities in 3D photonic crystal can trap and store light in the smallest volumes allowable in dielectric materials, enhancing non-linearities and cavity QED effects. Here, we study inverse rod-connected diamond (RCD) crystals containing point defect cavities using plane-wave expansion and finite-difference time domain methods. By optimizing the dimensions of the crystal, wide photonic band gaps are obtained. Mid-bandgap resonances can then be engineered by introducing point defects in the crystal. We investigate a variety of single spherical defects at different locations in the unit cell focusing on high-refractive-index contrast (3.3:1) inverse RCD structures; quality factors (Q-factors) and mode volumes of the resonant cavity modes are calculated. By choosing a symmetric arrangement, consisting of a single sphere defect located at the center of a tetrahedral arrangement, mode volumes < 0.06 cubic wavelengths are obtained, a record for high index cavities.

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M. P. C. Taverne, Y. -L. D. Ho, X. Zheng, S. Liu, L. -F. Chen, M. Lopez-Garcia, J. G. Rarity. 2016-10-31. Modelling Defect Cavities Formed in Inverse Three-Dimensional Rod-Connected Diamond Photonic Crystals. https://doi.org/10.1209/0295-5075%2F116%2F64007

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