Metasurfaces and Colloidal Suspensions Composed of 3D Chiral Si Nanoresonators
Artikel i vetenskaplig tidskrift, 2017

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.

generation

optical trapping

light-scattering

nanoantennas

Materials Science

lithography

Science & Technology - Other Topics

Chemistry

Physics

silicon nanoparticles

chirality

resonances

metamaterials

colloidal solutions

high-index dielectrics

Författare

Ruggero Verre

Chalmers, Fysik, Bionanofotonik

Lei Shao

Chalmers, Fysik, Bionanofotonik

Nils Odebo Länk

Chalmers, Fysik, Bionanofotonik

Pawel Karpinski

Chalmers, Fysik, Bionanofotonik

Andrew Yankovich

Chalmers, Fysik, Eva Olsson Group

Tomasz Antosiewicz

Chalmers, Fysik, Bionanofotonik

Eva Olsson

Chalmers, Fysik, Eva Olsson Group

Mikael Käll

Chalmers, Fysik, Bionanofotonik

Advanced Materials

0935-9648 (ISSN)

Vol. 29 29

Ämneskategorier

Materialkemi

Annan fysik

Den kondenserade materiens fysik

DOI

10.1002/adma.201701352

Mer information

Skapat

2017-10-07