Free-standing terahertz chiral meta-foils exhibiting strong optical activity and negative refractive index

Jianfeng Wu, Binghao Ng, Shuvan P. Turaga, Mark B.H. Breese, Stefan A. Maier, Minghui Hong, Andrew A. Bettiol, Herbert O. Moser

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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.

Original languageEnglish
Article number141106
Number of pages5
JournalApplied Physics Letters
Issue number14
Publication statusPublished - 30 Sept 2013
Externally publishedYes

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