Investigation of defect cavities formed in three-dimensional woodpile photonic crystals

Taverne, Mike P. C., Ho, Daniel and Rarity, John G. (2015) Investigation of defect cavities formed in three-dimensional woodpile photonic crystals. Journal of the Optical Society of America B, 32 (4). pp. 639-648. ISSN 0740-3224

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We report the optimisation of optical properties of single defects in three-dimensional (3D) face-centred-cubic (FCC) woodpile photonic crystal (PC) cavities by using plane-wave expansion (PWE) and finite-difference time-domain (FDTD) methods. By optimising the dimensions of a 3D woodpile PC, wide photonic band gaps (PBG) are created. Optical cavities with resonances in the bandgap arise when point defects are introduced in the crystal. Three types of single defects are investigated in high refractive index contrast (Gallium Phosphide-Air) woodpile structures and Q-factors and mode volumes (Veff) of the resonant cavity modes are calculated. We show that, by introducing an air buffer around a single defect, smaller mode volumes can be obtained. We demonstrate high Q-factors up to 700000 and cavity volumes down to Veff<0.2(λ/n)3. The estimates of Q and Veff are then used to quantify the enhancement of spontaneous emission and the possibility of achieving strong coupling with nitrogen-vacancy (NV) colour centres in diamond.

Item Type: Article
Uncontrolled Keywords: Photonic crystals, Microcavities, Quantum electrodynamics, Nanophotonics and photonic crystals
Subjects: H600 Electronic and Electrical Engineering
J500 Materials Technology not otherwise specified
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Paul Burns
Date Deposited: 12 Sep 2019 14:36
Last Modified: 10 Oct 2019 15:17

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