CST – Computer Simulation Technology

Helical Plasmonic Nanostructures as Prototypical Chiral Near-Field Sources

Title:
Helical Plasmonic Nanostructures as Prototypical Chiral Near-Field Sources
Author(s):
Martin Schäferling, Xinghui Yin, Nader Engheta, Harald Giessen
Source:
ACS Photonics 2014
Vol./Issue/Date:
1, May 12, 2014
Year:
2015
Page(s):
530-537
Keywords:
optical chirality, plasmonics, near-field response, numerical simulation, circular dichroism, chiroptical spectroscopy
Abstract:
Plasmonic nanostructures can generate electromagnetic fields with high optical chirality that interact strongly with chiral molecules. We demonstrate how structures with chiral eigenmodes lead to chiral near-fields of predominantly one handedness. Our theoretical design with multiple metallic helices exhibits very high optical chirality over a large volume. The expected averaged chiroptical interaction is almost 2 orders of magnitude higher than for circularly polarized light.
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