Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 76: Plasmonics & Nanooptics V: Nanostructures and Nanoantennae

O 76.10: Vortrag

Donnerstag, 4. April 2019, 12:45–13:00, H8

First-order perturbation theory for material changes in the surrounding of open optical resonators — •Steffen Both and Thomas Weiss — 4th Physics Institute and Research Center SCoPE, University of Stuttgart

Nanophotonic structures such as photonic crystals or plasmonic nanoparticles allow the realization of optical resonances with strong electromagnetic near-fields. In such structures, even tiny material changes in the environment can have significant influence on the resonances frequencies. This effect is the key to various kinds of optical sensing applications [1]. So far, the modeling of these interactions often relies on extensive numerical simulations, which can be rather inefficient, since in many practical cases, the variations in the material properties are extremely small. Here, we present a simple perturbation theory, that is particularly suited for these cases, and that allows to very efficiently calculate the resonance shifts and linewidth changes induced by small material modifications in the surrounding of almost any kind of open optical resonator. Our main result is a simple integral expression over the fields of the unperturbed system, which extends previous works from the field of resonant state expansion [1-4].

[1] T. Weiss, et al., Phys. Rev. B 96, 045129 (2017).

[2] M. B. Doost, et al., Phys. Rev. A 90, 013834 (2014).

[3] J. Yang, et al., Nano Lett. 15, 3439 (2015).

[4] T. Weiss et al., Phys. Rev. B 98, 085433 (2018).