Journal
OPTICS LETTERS
Volume 44, Issue 24, Pages 5917-5920Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.44.005917
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Funding
- Deutsche Forschungsgemeinschaft
- Volkswagen Foundation
- Ministerium fur Wissenschaft
- Forschung und KunstBaden-Wurttemberg
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The single-mode approximation of resonant state expansion has proven to give accurate first-order approximations of resonance shifts and linewidth changes when modifying the material properties inside open optical resonators. Here, we extend this first-order perturbation theory to modifications of the material properties in the surrounding medium. As a side product of our derivations, we retrieve the already known analytical normalization condition for resonant states. We apply our theory to two example systems: a metallic nanosphere and a periodic array of metallic nanoslits. (C) 2019 Optical Society of America
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