Chiral optical response of planar and symmetric nanotrimers enabled by heteromaterial selection

Peter Banzer (), Paweł Woźniak, Uwe Mick, Israel De Leon and Robert W. Boyd
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Peter Banzer: Max Planck Institute for the Science of Light, Guenther-Scharowsky-Straße 1, D-91058 Erlangen, Germany
Paweł Woźniak: Max Planck Institute for the Science of Light, Guenther-Scharowsky-Straße 1, D-91058 Erlangen, Germany
Uwe Mick: Max Planck Institute for the Science of Light, Guenther-Scharowsky-Straße 1, D-91058 Erlangen, Germany
Israel De Leon: University of Ottawa
Robert W. Boyd: University of Ottawa

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Chirality is an intriguing property of certain molecules, materials or artificial nanostructures, which allows them to interact with the spin angular momentum of the impinging light field. Due to their chiral geometry, they can distinguish between left- and right-hand circular polarization states or convert them into each other. Here we introduce an approach towards optical chirality, which is observed in individual two-dimensional and geometrically mirror-symmetric nanostructures. In this scheme, the chiral optical response is induced by the chosen heterogeneous material composition of a particle assembly and the corresponding resonance behaviour of the constituents it is built from, which breaks the symmetry of the system. As a proof of principle, we investigate such a structure composed of individual silicon and gold nanoparticles both experimentally, as well as numerically. Our proposed concept constitutes an approach for designing two-dimensional chiral media tailored at the nanoscale, allowing for high tunability of their optical response.

Date: 2016
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DOI: 10.1038/ncomms13117

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