Analytic Optimization of Near-Field Optical Chirality Enhancement.
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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 is presented and it is demonstrated that local opticalChirality is significantly enhanced with respect to circular polarization in free space.Abstract:
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 achiral 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.read more
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References
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Gold Helix Photonic Metamaterial as Broadband Circular Polarizer
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Ultrasensitive detection and characterization of biomolecules using superchiral fields
Euan Hendry,T. Carpy,J. Johnston,M. Popland,Rostislav Mikhaylovskiy,Adrian J. Lapthorn,Sharon M. Kelly,Laurence D. Barron,Nikolaj Gadegaard,Malcolm Kadodwala +9 more
TL;DR: It is shown that superchiral electromagnetic fields, generated by the optical excitation of plasmonic planar chiral metamaterials, are highly sensitive probes of chiral supramolecular structure.
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Twisted optical metamaterials for planarized ultrathin broadband circular polarizers
TL;DR: A new paradigm for the realization of optical metamaterials is introduced, showing that three-dimensional effects may be obtained without complicated inclusions, but instead by tailoring the relative orientation within the lattice.
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Yiqiao Tang,Adam E. Cohen +1 more
TL;DR: A measure of the local density of chirality of the electromagnetic field determines the asymmetry in the rates of excitation between a small chiral molecule and its mirror image, and applies to molecules in electromagnetic fields with arbitrary spatial dependence.
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