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Giant rotary power of a fishnet-like metamaterial

Author(s): Shengxiang Wang | Frédéric Garet | Éric Lheurette | Magali Astic | Jean-Louis Coutaz | Didier Lippens

Journal: APL Materials
ISSN 2166-532X

Volume: 1;
Issue: 3;
Start page: 032116;
Date: 2013;
Original page

We show experimentally and numerically that cholesteric-type metal-dielectric structures, made of twisted sub-wavelength hole elliptical–shaped arrays, exhibit strong optical activity and circular dichroism. The experimental demonstration is carried out with terahertz time-domain spectroscopy measurements on a three layered structure operating around 0.5 THz, leading to a rotary power as high as 1000°/wavelength. The contribution of the chirality factor (κ), permittivity (ɛ), and permeability (μ) is discussed after the retrieval of effective parameters from the complex scattering ones.
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