Metal nanoantennas have been under intense investigation due to their strong light−matter interactions and significant polarization sensitivities determined by their nanoscale structure. For applications seeking to realize on-chip polarization-discriminating nanoantennas, efficient energy conversion from surface waves to far-field radiation is desirable. However, the response of individual nanoantennas to the particular polarization states achievable in surface waves, such as evanescent fields, has not yet been thoroughly investigated. <br/>Here, we report the giant modulation of the visible light scattering predicted from achiral gold half-ring, pinwheel, and other nanoantennas excited through total internal reflection of left- and right-handed circularly polarized light, by exploiting the distinct polarization properties of surface evanescent waves. Such properties are shown to be required for observing intense polarization-dependent responses. This result provides a fundamentally different mechanism for chiroptical responses requiring a phase delay between transverse and longitudinal electric field oscillations, not found in free-space light, whereas traditional mechanisms of circular dichroism only require structural sensitivity to a relative phase difference between transverse-field oscillations.<br/>More specifically, we focus on the insight provided by theory, and in particular by the electromagnetic simulations, performed with the software COMSOL Multiphysics, of the different systems of interest and aspects of their chiroptical response.

Evanescent field polarization for giant chiroptical modulation from achiral gold half-rings: Theoretical insight from simulations

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.