Abstract
We present an experimental study of Hetero-Chiral (HC) plasmonic lenses, comprised of constituents with opposite chirality, demonstrating linearly dichroic focusing. The lenses focus only light with a specific linear polarization and result in a dark focal spot for the orthogonal polarization state. We introduce the design concepts and quantitatively compare several members of the HC family, deriving necessary conditions for linear dichroism and several comparative engineering parameters. The HC lenses were experimentally investigated using aperture-less near field scanning microscope collecting the amplitude of the plasmonic near-field. Our results exhibit an excellent match to the simulation predictions. The demonstrated ability for linearly dichroic functional focusing could lead to novel sensing applications.
Highlights
Surface plasmons polaritons (SPPs) are surface electromagnetic waves coupled with collective oscillation of electrons at metal-dielectric interfaces
Planar chiral symmetry is ascribed to objects lacking in-plane mirror symmetry
When it comes to electromagnetism, it is well known that chiral structures exhibit circular dichroism, that is, they can discriminate the handedness of circularly polarized light
Summary
Surface plasmons polaritons (SPPs) are surface electromagnetic waves coupled with collective oscillation of electrons at metal-dielectric interfaces. Planar chiral symmetry is ascribed to objects lacking in-plane mirror symmetry When it comes to electromagnetism, it is well known that chiral structures exhibit circular dichroism, that is, they can discriminate the handedness of circularly polarized light. This property was studied, applied and demonstrated in various metamaterials [4, 5]. In our work we employed various nano-engraved plasmonic structures in gold comprising different spiral types and their engagements to generate linearly dichroic focusing and higher order caustics of polarized longitudinal fields
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