Polarized evanescent waves reveal trochoidal dichroism

Matter’s sensitivity to light polarization is characterized by linear and circular polarization effects, corresponding to the system’s anisotropy and handedness, respectively. Recent investigations into the near-field properties of evanescent waves have revealed polarization states with out-of-phase...

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Published in:Proceedings of the National Academy of Sciences - PNAS 2020-07, Vol.117 (28), p.16143-16148
Main Authors: McCarthy, Lauren A., Smith, Kyle W., Lan, Xiang, Jebeli, Seyyed Ali Hosseini, Bursi, Luca, Alabastri, Alessandro, Chang, Wei-Shun, Nordlander, Peter, Link, Stephan
Format: Article
Language:English
Subjects:
Anisotropy
Circular dichroism
Circular polarization
Dichroism
Dipoles
Directional sensitivity
Evanescent waves
Excitation
Handedness
Oscillations
Physical Sciences
Polarization
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creator McCarthy, Lauren A.
Smith, Kyle W.
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Link, Stephan
description Matter’s sensitivity to light polarization is characterized by linear and circular polarization effects, corresponding to the system’s anisotropy and handedness, respectively. Recent investigations into the near-field properties of evanescent waves have revealed polarization states with out-of-phase transverse and longitudinal oscillations, resulting in trochoidal, or cartwheeling, field motion. Here, we demonstrate matter’s inherent sensitivity to the direction of the trochoidal field and name this property trochoidal dichroism. We observe trochoidal dichroism in the differential excitation of bonding and antibonding plasmon modes for a system composed of two coupled dipole scatterers. Trochoidal dichroism constitutes the observation of a geometric basis for polarization sensitivity that fundamentally differs from linear and circular dichroism. It could also be used to characterize molecular systems, such as certain light-harvesting antennas, with cartwheeling charge motion upon excitation.
doi_str_mv 10.1073/pnas.2004169117
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subjects Anisotropy
Circular dichroism
Circular polarization
Dichroism
Dipoles
Directional sensitivity
Evanescent waves
Excitation
Handedness
Oscillations
Physical Sciences
Polarization
title Polarized evanescent waves reveal trochoidal dichroism
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