Plasmonic ratchet wheels: switching circular dichroism by arranging chiral nanostructures.
We demonstrate circular dichroism (CD) in the second harmonic generation (SHG) signal from chiral assemblies of G-shaped nanostructures made of gold. The arrangement of the G shapes is crucial since upon reordering them the SHG-CD effect disappears. Microscopy reveals SHG "hotspots" assemblies, which originate in enantiomerically sensitive plasmon modes, having the novel property of exhibiting a chiral geometry themselves in relation with the handedness of the material. These results open new frontiers in studying chirality.
Valev
V K
VK
Molecular Electronics and Photonics, INPAC, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium. v.k.valev@fys.kuleuven.be
Smisdom
N
N
Silhanek
A V
AV
De Clercq
B
B
Gillijns
W
W
Ameloot
M
M
Moshchalkov
V V
VV
Verbiest
T
T