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Objects of Maximum Electromagnetic Chirality

Fernandez-Corbaton, Ivan; Fruhnert, Martin; Rockstuhl, Carsten

Abstract (englisch):
We introduce a definition of the electromagnetic chirality of an object and show that it has an upper bound. Reciprocal objects attain the upper bound if and only if they are transparent for all the fields of one polarization handedness (helicity). Additionally, electromagnetic duality symmetry, i.e., helicity preservation upon interaction, turns out to be a necessary condition for reciprocal objects to attain the upper bound. We use these results to provide requirements for the design of such extremal objects. The requirements can be formulated as constraints on the polarizability tensors for dipolar objects or on the material constitutive relations for continuous media. We also outline two applications for objects of maximum electromagnetic chirality: a twofold resonantly enhanced and background-free circular dichroism measurement setup, and angle-independent helicity filtering glasses. Finally, we use the theoretically obtained requirements to guide the design of a specific structure, which we then analyze numerically and discuss its performance with respect to maximal electromagnetic chirality.

Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Theoretische Festkörperphysik (TFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1103/PhysRevX.6.031013
ISSN: 2160-3308
URN: urn:nbn:de:swb:90-593726
KITopen ID: 1000059372
HGF-Programm 43.23.01; LK 01
Erschienen in Physical review / X
Band 6
Heft 3
Seiten Art.Nr.:031013
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