Abstract
Geometrical chirality is required to obtain chiroptical far-field responses. We demonstrate in this chapter that chiral near-field responses, on the other hand, can be obtained in systems that are completely achiral. This is shown for a linear rod antenna illuminated with linearly polarized light parallel to the antenna axis under normal incidence. We explain the origin of the chiral near-fields in such systems with a simple dipole model and compare different illumination conditions. Based on these findings, we discuss a scheme for chiroptical spectroscopy with alternating orthogonal linear polarizations. This scheme is theoretically substantiated by numerical simulations combining the plasmonic near-field source with an effective chiral medium.
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Notes
- 1.
In rotationally symmetric planar geometrically chiral systems, differential scattering and absorption has been predicted. However, both responses add up such that no differential extinction , which is the only response directly accessible via far-field measurements, occurs [1].
- 2.
Note that any chiral medium must be absorptive. Otherwise, artificial gain would be introduced for one polarization because \({n^\pm = n\pm \kappa }\) (see (2.67)).
- 3.
This configuration is not the exact implementation of the proposed design in Fig. 7.6, but it behaves similarly while being easier to realize in our simulation tool.
- 4.
Please refer to Sect. 2.2.3 for details about the frequency dependence of this response.
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Schäferling, M. (2017). Formation of Chiral Fields Near Symmetric Structures. In: Chiral Nanophotonics. Springer Series in Optical Sciences, vol 205. Springer, Cham. https://doi.org/10.1007/978-3-319-42264-0_7
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DOI: https://doi.org/10.1007/978-3-319-42264-0_7
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