2022
DOI: 10.1038/s41598-021-03908-2
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Tunable circular dichroism through absorption in coupled optical modes of twisted triskelia nanostructures

Abstract: We present a system consisting of two stacked chiral plasmonic nanoelements, so-called triskelia, that exhibits a high degree of circular dichroism. The optical modes arising from the interactions between the two elements are the main responsible for the dichroic signal. Their excitation in the absorption cross section is favored when the circular polarization of the light is opposite to the helicity of the system, so that an intense near-field distribution with 3D character is excited between the two triskeli… Show more

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Cited by 3 publications
(3 citation statements)
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“…Other shapes could be as simple as nanocylinders, [19,20] nanocuboids, [101] split rings, [102,103] and crosses, [104] or as complex as gammadions, [95,105] rosettes, [26] and triskelia. [106] In a bilayer or few-layer geometry, decreasing the interlayer separation distance between meta-atoms increases the interantenna coupling. Translational and rotational displacements between layers are also efficient for actively changing the near-field interactions in an identical metamaterial design.…”
Section: Chiral Metasurfaces Based On Subwavelength Structural Motifsmentioning
confidence: 99%
See 1 more Smart Citation
“…Other shapes could be as simple as nanocylinders, [19,20] nanocuboids, [101] split rings, [102,103] and crosses, [104] or as complex as gammadions, [95,105] rosettes, [26] and triskelia. [106] In a bilayer or few-layer geometry, decreasing the interlayer separation distance between meta-atoms increases the interantenna coupling. Translational and rotational displacements between layers are also efficient for actively changing the near-field interactions in an identical metamaterial design.…”
Section: Chiral Metasurfaces Based On Subwavelength Structural Motifsmentioning
confidence: 99%
“…[16,18,139,150] The thickness of the interlayer dielectric also affects the chiroptical signal, which has been demonstrated for metasurfaces of graphene nanoribbon arrays, [114,151] aligned plasmonic nanowires, [17] nanohole arrays, [139] nanoantenna arrays, [124] and single triskelion element. [106] Another consideration is that the interlayer spacing can be engineered to match the helical feature of the circularly polarized incidence in order to modulate lightchiral matter interactions. [152] Last, for certain mechanically flexible metasurfaces, strain engineering allows reversible modulation of the CD spectra.…”
Section: Tunability Of CD Signals In Chiral Twisted Metasurfacesmentioning
confidence: 99%
“…Normally, the chiral nature of the structure is reflected as quantitative differences in the values of the absorption or scattering cross-sections. Only recently, it has been put forward that it is possible to find helicity-dependent absorption resonances while the scattering remains essentially helicity-independent [ 3 ]. Our work demonstrates that, through the interactions between different elements, it is possible to make the absorption and scattering cross-sections radically and qualitatively different for the two circular polarizations.…”
Section: Introductionmentioning
confidence: 99%