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Truncated photonic crystal cavities with optimized mode confinement

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3 Author(s)
Bauer, Carl A. ; Department of Physics and the Center for Integrated Plasma Studies, University of Colorado, Boulder, Colorado 80309, USA ; Werner, Gregory R. ; Cary, J.R.

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Optimization of a truncated, dielectric photonic crystal cavity leads to configurations that are far from truncated crystal cavities, and which have significantly better radiation confinement. Starting from a two-dimensional truncated photonic crystal cavity with optimal Q-factor, moving the rods from the lattice positions can increase the Q-factor by orders of magnitude, e.g., from 130 to 11 000 for a cavity constructed from 18 rods. In the process, parity symmetry breaking occurs. Achieving the same Q-factor with a regular lattice requires 60 rods. Therefore, using optimized irregular structures for photonic cavities can greatly reduce material requirements and device size.

Published in:

Journal of Applied Physics  (Volume:104 ,  Issue: 5 )