Frankfurt 2006 – scientific programme

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Q: Quantenoptik und Photonik

Q 25: Photonische Kristalle II

Q 25.1: Talk

Tuesday, March 14, 2006, 13:45–14:00, HI

Resonant modes and lasing in deterministically aperiodic nanopillar arrays — •Sergei V. Zhukovsky, Dmitry N. Chigrin, and Johann Kroha — Physikalisches Institut, Universität Bonn, Nussallee 12, 53115 Bonn, Germany

As shown previously [1], periodic one-dimensional nanopillar arrays can function as waveguides. We consider an analogous system of nanopillars arranged in a deterministically aperiodic (DA) fashion, namely, according to quasiperiodic Fibonacci and fractal Cantor sequences [2]. It has been shown that such a nanopillar structure can exhibit both waveguide-like and resonant properties. The resonant modes present in a fractal nanopillar structure are highly localized and possess a Q-factor comparable with the resonant mode of a point defect embedded in a periodic waveguide. At the same time, the modes in a DA waveguide show much better coupling with a coaxially placed terminal allowing energy exchange of a resonator with other optical components. The coupling is especially increased when the symmetry of a DA structure is slightly broken, which does not diminish the Q-factor or mode localization. It can be shown that owing to increased coupling, such a resonant system can be used as a microlaser when nanopillars contain an active medium.

[1] D. N. Chigrin, A. V. Lavrinenko, C. M. Sotomayor-Torres, Opt. Express 12, 617 (2004).

[2] A. V. Lavrinenko, S. V. Zhukovsky, K. S. Sandomirskii, S. V. Gaponenko, Phys. Rev. E 65, 036621 (2002).