Kavli Affiliate: Ulrich Wiesner
| First 5 Authors: Cédric Kilchoer, Narjes Abdollahi, James A. Dolan, Doha Abdelrahman, Matthias Saba
| Summary:
Over the past two decades, metamaterials have led to an increasing number of
biosensing and nanophotonic applications due to the possibility of a careful
control of light propagating through subwavelength features. Chiral
nanostructures (characterized by the absence of any mirror symmetry), in
particular, give rise to unique chiro-optical properties such as circular
dichroism and optical activity. Here, we present a gyroid optical metamaterial
with a periodicity of 65 nm exhibiting a strong circular dichroism at visible
wavelengths. Our bottom-up approach, based on metallic replication of the
gyroid morphology in triblock terpolymer films, generates a large area of
periodic optical metamaterials. We observe a strong circular dichroism in gold
and silver gyroid metamaterials at visible wavelengths. We show that the
circular dichroism is inherently linked to the handedness of the gyroid
nanostructure, and demonstrate its tuneability. The optical effects are
discussed and compared to other existing systems, showing the potential of
bottom-up approaches for large-scale circular filters and chiral sensing.
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