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Maximizing the electromagnetic chirality of thin metallic nanowires at optical frequencies

Fernandez-Corbaton, Ivan ORCID iD icon 1; Griesmaier, Roland 2; Knöller, Marvin 2; Rockstuhl, Carsten 1
1 Institut für Theoretische Festkörperphysik (TFP), Karlsruher Institut für Technologie (KIT)
2 Institut für Angewandte und Numerische Mathematik (IANM), Karlsruher Institut für Technologie (KIT)


Electromagnetic waves impinging on three-dimensional helical metallic metamaterials have been shown to exhibit chiral effects of large magnitude both theoretically and in experimental realizations. Chirality here describes different responses of scatterers, materials, or metamaterials to left and right circularly polarized electromagnetic waves. These differences can be quantified in terms of electromagnetic chirality measures. In this work we consider the optimal design of thin metallic free-form nanowires that possess measures of electromagnetic chirality as large as fundamentally possible. We focus on optical frequencies and use a gradient based optimization scheme to determine the optimal shape of highly chiral thin silver and gold nanowires. The electromagnetic chirality measures of our optimized nanowires exceed that of traditional metallic helices. Therefore, these should be well suited as building blocks of novel metamaterials with an increased chiral response. We discuss a series of numerical examples, and we evaluate the performance of different optimized designs.

Volltext §
DOI: 10.5445/IR/1000149970
Veröffentlicht am 16.08.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte und Numerische Mathematik (IANM)
Institut für Nanotechnologie (INT)
Institut für Theoretische Festkörperphysik (TFP)
Sonderforschungsbereich 1173 (SFB 1173)
Publikationstyp Forschungsbericht/Preprint
Publikationsmonat/-jahr 08.2022
Sprache Englisch
Identifikator ISSN: 2365-662X
KITopen-ID: 1000149970
Verlag KIT, Karlsruhe
Umfang 27 S.
Serie CRC 1173 Preprint ; 2022/34
Projektinformation SFB 1173/2 (DFG, DFG KOORD, SFB 1173/2 2019)
Externe Relationen Siehe auch
Schlagwörter electromagnetic scattering, chirality, shape optimization, maximally chiral nanowires
Nachgewiesen in arXiv
Relationen in KITopen
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