Metasurfaces and Colloidal Suspensions Composed of 3D Chiral Si Nanoresonators
Journal article, 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.


optical trapping



Materials Science


Science & Technology - Other Topics



silicon nanoparticles




colloidal solutions

high-index dielectrics


Ruggero Verre

Chalmers, Physics, Bionanophotonics

Lei Shao

Chalmers, Physics, Bionanophotonics

Nils Odebo Länk

Chalmers, Physics, Bionanophotonics

Pawel Karpinski

Chalmers, Physics, Bionanophotonics

Andrew Yankovich

Chalmers, Physics, Eva Olsson Group

Tomasz Antosiewicz

Chalmers, Physics, Bionanophotonics

Eva Olsson

Chalmers, Physics, Eva Olsson Group

Mikael Käll

Chalmers, Physics, Bionanophotonics

Advanced Materials

09359648 (ISSN) 15214095 (eISSN)

Vol. 29 29 1701352

Subject Categories

Materials Chemistry

Other Physics Topics

Condensed Matter Physics



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4/5/2022 7