Free-standing terahertz chiral meta-foils exhibiting strong optical activity and negative refractive index
- 30 September 2013
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 103 (14) , 141106
Abstract
A chiral meta-foil consisting of a self-supported square array of interconnected conjugated rosettes is demonstrated at terahertz frequencies. It exhibits strong optical activity and circular dichroism. Negative refractive index with a figure-of-merit as high as 4.2 is achieved, attributed to its free-standing nature. Experimental results are in good agreement with numerical simulation. Free-standing chiral meta-foils provide a unique approach to create a completely all-metal chiral metamaterial, which can be flexibly integrated into optical setups while eliminating dielectric insertion losses.Keywords
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