Exact mode volume and Purcell factor of open optical systems

Muljarov, E. A. ORCID: https://orcid.org/0000-0002-2878-4148 and Langbein, W. ORCID: https://orcid.org/0000-0001-9786-1023 2016. Exact mode volume and Purcell factor of open optical systems. Physical Review B 94 (23) , 235438. 10.1103/PhysRevB.94.235438

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Abstract

The Purcell factor quantifies the change of the radiative decay of a dipole in an electromagnetic environment relative to free space. Designing this factor is at the heart of photonics technology, striving to develop ever smaller or less lossy optical resonators. The Purcell factor can be expressed using the electromagnetic eigenmodes of the resonators, introducing the notion of a mode volume for each mode. This approach allows an analytic treatment, reducing the Purcell factor and other observables to sums over eigenmode resonances. Calculating the mode volumes requires a correct normalization of the modes. We introduce an exact normalization of modes, not relying on perfectly matched layers. We present an analytic theory of the Purcell effect based on this exact mode normalization and the resulting effective mode volume. We use a homogeneous dielectric sphere in vacuum, which is analytically solvable, to exemplify these findings. We furthermore verify the applicability of the normalization to numerically determined modes of a finite dielectric cylinder.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	American Physical Society
ISSN:	2469-9950
Funders:	EPSRC
Date of First Compliant Deposit:	18 May 2017
Date of Acceptance:	22 November 2016
Last Modified:	03 May 2023 17:19
URI:	https://orca.cardiff.ac.uk/id/eprint/100687

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