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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 6 — Mar. 14, 2011
  • pp: 5670–5675

Mode structure of coupled L3 photonic crystal cavities

A. R. A. Chalcraft, S. Lam, B. D. Jones, D. Szymanski, R. Oulton, A. C. T. Thijssen, M. S. Skolnick, D. M. Whittaker, T. F. Krauss, and A. M. Fox  »View Author Affiliations

Optics Express, Vol. 19, Issue 6, pp. 5670-5675 (2011)

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We investigate the energy splitting, quality factor and polarization of the fundamental modes of coupled L3 photonic crystal cavities. Four different geometries are evaluated theoretically, before experimentally investigating coupling in a direction at 30° to the line of the cavities. In this geometry, a smooth variation of the energy splitting with the cavity separation is predicted and observed, together with significant differences between the polarizations of the bonding and anti-bonding states. The controlled splitting of the coupled states is potentially useful for applications that require simultaneous resonant enhancement of two transitions.

© 2011 Optical Society of America

OCIS Codes
(230.5590) Optical devices : Quantum-well, -wire and -dot devices
(230.4555) Optical devices : Coupled resonators
(230.5298) Optical devices : Photonic crystals

ToC Category:
Photonic Crystals

Original Manuscript: December 23, 2010
Revised Manuscript: February 25, 2011
Manuscript Accepted: February 25, 2011
Published: March 11, 2011

A. R. A. Chalcraft, S. Lam, B. D. Jones, D. Szymanski, R. Oulton, A. C. T. Thijssen, M. S. Skolnick, D. M. Whittaker, T. F. Krauss, and A. M. Fox, "Mode structure of coupled L3 photonic crystal cavities," Opt. Express 19, 5670-5675 (2011)

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  19. The modal volumes are similar for B and AB modes, and vary by less than 10% over the range of separations considered. For example, at smallest separation, the B and AB values are 1.64(⌊ /n)3 and 1.77(⌊ /n)3 respectively. This compares with V = 0.76(⌊ /n)3 for an isolated cavity in the same lattice.
  20. Three other modes exist between the _ + −1_ and _−−2_ modes. Unfortunately, the close spacings and low qualityfactors of these other modes [18] make it impractical to identify their peaks unambiguosly in Fig. 3. It is, however,likely that the predicted 1.5 meV splitting of the _ + + 1_ mode is responsible for the most prominent features; thepredicted splittings of the other two modes are insufficient to explain the peak around 1.32 eV.21.
  21. Note that the results for the FDTD simluations become inaccurate for the largest cavity separation, since theintensity above the center of the double cavity becomes very low.
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Fig. 1 Fig. 2 Fig. 3
Fig. 4 Fig. 5

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