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Metasurfaces and Colloidal Suspensions Composed of 3D Chiral Si Nanoresonators

Ruggero Verre (Institutionen för fysik, Bionanofotonik (Chalmers)) ; Lei Shao (Institutionen för fysik, Bionanofotonik (Chalmers)) ; Nils Odebo Länk (Institutionen för fysik, Bionanofotonik (Chalmers)) ; Pawel Karpinski (Institutionen för fysik, Bionanofotonik (Chalmers)) ; Andrew Yankovich (Institutionen för fysik, Eva Olsson Group (Chalmers)) ; Tomasz Antosiewicz (Institutionen för fysik, Bionanofotonik (Chalmers)) ; Eva Olsson (Institutionen för fysik, Eva Olsson Group (Chalmers)) ; Mikael Käll (Institutionen för fysik, Bionanofotonik (Chalmers))
Advanced Materials (0935-9648). Vol. 29 (2017), 29,
[Artikel, refereegranskad vetenskaplig]

High-refractive-index silicon nanoresonators are promising low-loss alternatives to plasmonic particles in CMOS-compatible nanophotonics applications. However, complex 3D particle morphologies are challenging to realize in practice, thus limiting the range of achievable optical functionalities. Using 3D film structuring and a novel gradient mask transfer technique, the first intrinsically chiral dielectric metasurface is fabricated in the form of a monolayer of twisted silicon nanocrescents that can be easily detached and dissolved into colloidal suspension. The metasurfaces exhibit selective handedness and a circular dichroism as large as 160 degrees mu m(-1) due to pronounced differences in induced current loops for left-handed and right-handed polarization. The detailed morphology of the detached particles is analyzed using high-resolution transmission electron microscopy. Furthermore, it is shown that the particles can be manipulated in solution using optical tweezers. The fabrication and detachment method can be extended to different nanoparticle geometries and paves the way for a wide range of novel nanophotonic experiments and applications of high-index dielectrics.

Nyckelord: chirality, colloidal solutions, high-index dielectrics, optical trapping, silicon nanoparticles, light-scattering, metamaterials, nanoantennas, lithography, resonances, generation, Chemistry, Science & Technology - Other Topics, Materials Science, Physics



Denna post skapades 2017-08-30. Senast ändrad 2017-10-03.
CPL Pubid: 251506

 

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