Volume 116, Number 6, December 2016
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||16 February 2017|
Modelling defect cavities formed in inverse three-dimensional rod-connected diamond photonic crystals
Department of Electrical and Electronic Engineering, University of Bristol - Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, UK
Received: 20 October 2016
Accepted: 26 January 2017
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 bandgaps 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.
PACS: 42.70.Qs – Photonic bandgap materials / 42.55.Sa – Microcavity and microdisk lasers / 42.50.Pq – Cavity quantum electrodynamics; micromasers
© EPLA, 2016
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