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Influence of disorder on a Bragg microcavity

Tikhodeev, S. G., Muljarov, E. A., Langbein, W., Gippius, N. A., Giessen, H. and Weiss, T. 2021. Influence of disorder on a Bragg microcavity. Journal of the Optical Society of America B 38 (1) , pp. 139-150. 10.1364/JOSAB.402986
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Using the resonant-state expansion for leaky optical modes of a planar Bragg microcavity, we investigate the influence of disorder on its fundamental cavity mode. We model the disorder by randomly varying the thickness of the Bragg-pair slabs (composing the mirrors) and the cavity and calculate the resonant energy and linewidth of each disordered microcavity exactly, comparing the results with the resonant-state expansion for a large basis set and within its first and second orders of perturbation theory. We show that random shifts of interfaces cause a growth of the inhomogeneous broadening of the fundamental mode that is proportional to the magnitude of disorder. Simultaneously, the quality factor of the microcavity decreases inversely proportional to the square of the magnitude of disorder. We also find that first-order perturbation theory works very accurately up to a reasonably large disorder magnitude, especially for calculating the resonance energy, which allows us to derive qualitatively the scaling of the microcavity properties with disorder strength.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Optical Society of America
ISSN: 0740-3224
Date of First Compliant Deposit: 11 December 2020
Date of Acceptance: 11 November 2020
Last Modified: 22 Jan 2021 18:06

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