The resonant behavior of a single plasmonic helix
Posted on 2019-08-22 - 14:44
Chiral plasmonic nanostructures will be of increasing importance for future applications in the field of nano optics and metamaterials. Their sensitivity to incident circularly polarized light in combination with the ability of extreme electromagnetic field localization renders them ideal candidates for chiral sensing and for all-optical information processing. Here, the resonant modes of single plasmonic helices are investigated. We find that a single plasmonic helix can be efficiently excited with circularly polarized light of both equal and opposite handedness relative to that of the helix. An analytic model provides resonance conditions matching the results of full-field modeling. The underlying geometric considerations explain the mechanism of excitation and deliver quantitative design rules for plasmonic helices being resonant in a desired wavelength range. Based on the developed analytical design tool, single silver helices were fabricated and optically characterized. They show the expected strong chiroptical response to both
handednesses in the targeted visible range. With a value of 0.45 the experimentally realized dissymmetry factor is the largest obtained for single plasmonic helices in the visible range up to now.
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Hoeflich, Katja; Feichtner, Thorsten; Hansjürgen, Enno; Haverkamp, Caspar; Kollmann, Heiko; Lienau, Christoph; et al. (2019). The resonant behavior of a single plasmonic helix. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.4543661.v1
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AUTHORS (7)
KH
Katja Hoeflich
TF
Thorsten Feichtner
EH
Enno Hansjürgen
CH
Caspar Haverkamp
HK
Heiko Kollmann
CL
Christoph Lienau
MS
Martin Silies