Polarization conversion in plasmonic nanoantennas for metasurfaces using structural asymmetry and mode hybridization.

Abstract:

:Polarization control using single plasmonic nanoantennas is of interest for subwavelength optical components in nano-optical circuits and metasurfaces. Here, we investigate the role of two mechanisms for polarization conversion by plasmonic antennas: Structural asymmetry and plasmon hybridization through strong coupling. As a model system we investigate L-shaped antennas consisting of two orthogonal nanorods which lengths and coupling strength can be independently controlled. An analytical model based on field susceptibilities is developed to extract key parameters and to address the influence of antenna morphology and excitation wavelength on polarization conversion efficiency and scattering intensities. Optical spectroscopy experiments performed on individual antennas, further supported by electrodynamical simulations based on the Green Dyadic Method, confirm the trends extracted from the analytical model. Mode hybridization and structural asymmetry allow address-ing different input polarizations and wavelengths, providing additional degrees of freedom for agile polarization conversion in nanophotonic devices.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wiecha PR,Black LJ,Wang Y,Paillard V,Girard C,Muskens OL,Arbouet A

doi

10.1038/srep40906

subject

Has Abstract

pub_date

2017-01-19 00:00:00

pages

40906

issn

2045-2322

pii

srep40906

journal_volume

7

pub_type

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