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

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 fin...

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Bibliographic Details
Published in:arXiv.org 2017-01
Main Authors: Taverne, M P C, Ho, Y -L D, Zheng, X, Liu, S, L -F Chen, Lopez-Garcia, M, Rarity, J G
Format: Article
Language:English
Subjects:
Crystal defects
Diamonds
Dielectrics
Finite difference method
Holes
Photonic band gaps
Photonic crystals
Point defects
Three dimensional models
Time domain analysis
Unit cell
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1610.09954