Naslov
Relation between 2D/3D chirality and the appearance of chiroptical effects in real nanostructures

Autori
Arteaga, Oriol ; Sancho-Parramon, Jordi ; Nichols, Shane ; Maoz, Ben M. ; Canillas, Adolf ; Bosch, Salvador ; Markovich, Gil ; Kahr, Bart

Izvornik
Optics express (1094-4087) 24 (2016), 3; 2242-2252

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Nanomaterials ; Chiral media ; Surface plasmons

Sažetak
The optical activity of fabricated metallic nanostructures is investigated by complete polarimetry. While lattices decorated with nanoscale gammadia etched in thin metallic films have been described as two dimensional, planar nanostructures, they are better described as quasi-planar structures with some three dimensional character. We find that the optical activity of these structures arises not only from the dissymmetric backing by a substrate but, more importantly, from the selective rounding of the nanostructure edges. A true chiroptical response in the far-field is only allowed when the gammadia contain these non-planar features. This is demonstrated by polarimetric measurements in conjunction with electrodynamical simulations based on the discrete dipole approximation that consider non-ideal gammadia. It is also shown that subtle planar dissymmetries in gammadia are sufficient to generate asymmetric transmission of circular polarized light.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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