Volume 82, Number 3, May 2008
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||18 April 2008|
Directional emission from an optical microdisk resonator with a point scatterer
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
Corresponding author: H.Waalkens@rug.nl
Accepted: 10 March 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.
PACS: 42.55.Sa – Microcavity and microdisk lasers / 42.25.-p – Wave optics / 05.45.Mt – Quantum chaos; semiclassical methods
© EPLA, 2008
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