Journal
ACS PHOTONICS
Volume 4, Issue 2, Pages 396-406Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.6b00887
Keywords
optical chirality; plasmonics; near-field response; analytic optimization; femtosecond polarization pulse shaping; chiroptical spectroscopy
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Funding
- German Science Foundation (DFG) [1391]
- European Research Council (ERC) within the Consolidator Grant MULTISCOPE
- Advanced Grant COMPLEXPLAS
- European Cooperation in Science and Technology (COST) within the COST [MP1403]
- Baden-Wiirttemberg Stiftung
- Federal Ministry of Education and Research (BMBF)
- Volkswagen Foundation
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We present an analytic derivation for the enhancement of local optical chirality in the near field of plasmonic nanostructures by tuning the far-field polarization of external light. We illustrate the results by means of simulations with an a chiral and a chiral nanostructure assembly and demonstrate that local optical chirality is significantly enhanced with respect to circular polarization in free space. The optimal external far-field polarizations are different from both circular and linear. Symmetry properties of the nanostructure can be exploited to determine whether the optimal far-field polarization is circular. Furthermore, the optimal far-field polarization depends on the frequency, which results in complex-shaped laser pulses for broadband optimization.
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