Directional emission from an optical microdisk resonator with a point scattererC. P. Dettmann1, G. V. Morozov1, M. Sieber1 and H. Waalkens1, 2
1 Department of Mathematics, University of Bristol - Bristol BS8 1TW, UK, EU
2 Department of Mathematics, University of Groningen - Nijenborgh 9, 9747 AG Groningen, The Netherlands, EU
received 22 November 2007; accepted in final form 10 March 2008; published May 2008
published online 18 April 2008
We present a new design of dielectric microcavities supporting modes with large quality factors and highly directional light emission. The key idea is to place a point scatterer inside a dielectric circular microdisk. We show that, depending on the position and strength of the scatterer, this leads to strongly directional modes in various frequency regions while preserving the high Q-factors reminiscent of the whispering gallery modes of the microdisk without scatterer. The design is very appealing due to its simplicity, promising a cleaner experimental realisation than previously studied microcavity designs on the one hand and analytic tractability based on Green's function techniques and self-adjoint extension theory on the other.
42.55.Sa - Microcavity and microdisk lasers.
42.25.-p - Wave optics.
05.45.Mt - Quantum chaos; semiclassical methods.
© EPLA 2008