Journal
JOURNAL OF OPTICS
Volume 15, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2040-8978/15/12/125101
Keywords
metamaterials; optical activity; negligible circular dichroism
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Funding
- Australian Research Council [DP110100713, DE120100055]
- National Natural Science Foundation of China [61371047]
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We theoretically analyze the near-infrared properties of a chiral metamaterial constituting an array of twisted crosses and complementary crosses made of silver. Through rigorous full-wave numerical simulations, we demonstrate that this type of metamaterial exhibits wideband giant optical activity, with a polarization azimuth rotation angle reaching values as large as 1900 degrees per wavelength. Owing to the negligible loss at optical frequencies in the dielectric (magnesium fluoride) making up the metamaterial, we observe negligible circular dichroism and low dispersion of the polarization azimuth rotation angle over a wide frequency band. We envision that this type of chiral metamaterial will find extensive applications in optical communication systems and biological sensing.
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