Unidirectional emission from circular dielectric microresonators with a point scatterer

CP Dettmann, GV Morozov, MMA Sieber, H Waalkens

Research output: Contribution to journalArticle (Academic Journal)peer-review

56 Citations (Scopus)
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Abstract

Circular microresonators are micron-sized dielectric disks embedded in material of lower refractive index. They possess modes of extremely high Q-factors (low-lasing thresholds), which makes them ideal candidates for the realization of miniature laser sources. They have, however, the disadvantage of isotropic light emission caused by the rotational symmetry of the system. In order to obtain high directivity of the emission while retaining high Q-factors, we consider a microdisk with a pointlike scatterer placed off-center inside of the disk. We calculate the resulting resonant modes and show that some of them possess both of the desired characteristics. The emission is predominantly in the direction opposite to the scatterer. We show that classical ray optics is a useful guide to optimizing the design parameters of this system. We further find that exceptional points in the resonance spectrum influence how complex resonance wave numbers change if system parameters are varied.
Translated title of the contributionUnidirectional emission from circular dielectric microresonators with a point scatterer
Original languageEnglish
Article number063813
Number of pages11
JournalPhysical Review A: Atomic, Molecular and Optical Physics
Volume80
Issue number6
DOIs
Publication statusPublished - 8 Dec 2009

Bibliographical note

Publisher: APS

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