Berlin 2005 – scientific programme
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HL: Halbleiterphysik
HL 62: Photonische Kristalle IV
HL 62.6: Talk
Wednesday, March 9, 2005, 12:00–12:15, TU P164
Designing and Engineering of High-Q Photonic Crystal Defect Cavities — •F. Hofbauer, A. Kress, N. Reinelt, H. J. Krenner, M. Bichler, D. Schuh, and J. J. Finley — Walter Schottky Institut, TU München, 85748 Garching, Germany
We present investigations and calculations on localized light states in 2D photonic crystal defect cavities (PCDC). Our results enable us to control the spectral position of photonic modes inside the photonic bandgap and engineer their Q-factors.
Our samples consist of thin GaAs membranes into which a layer of InGaAs self assembled QDs are incorporated. The 2D photonic crystals consist of an etched hexagonal lattice of air holes. The defect cavities are either formed by a line of three missing holes (L3)1 or by one missing hole and the redistribution of the six surrounding holes (Y1)2.
Controlling the spectral position of single photonic modes over a range of ∼200nm in different PCDC together with 3D simulations of the PCDC enables us to tune and select the position of cavity modes relative to the photonic bandgap. Our investigations demonstrate a one order of magnitude change of the Q-factor for these designed photonic modes. The fine-tuning of the different PCDC designs enabled us to obtain Q-factors up to 8000 and mode-volumes less than 0.5(λ /n)3.
1 Y. Akahane et al., Nature, 425, 944 (2003)
2 J. Vučković and Y. Yamamoto, APL 82, 2374 (2003)