期刊
APPLIED PHYSICS LETTERS
卷 104, 期 22, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4880798
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资金
- Russian Science Foundation [14-12-00416]
- Russian Foundation for Basic Research [13-02-12151 ofi_m]
- Russian Science Foundation [14-12-00416] Funding Source: Russian Science Foundation
We report extremely strong optical activity and circular dichroism exhibited by subwavelength arrays of four-start-screw holes fabricated with single-pass focused ion beam milling of freely suspended silver films. Having the fourth order rotational symmetry, the structures exhibit the polarization rotation up to 90 degrees and peaks of full circular dichroism and operate as circular polarizers within certain ranges of wavelengths in the visible. We discuss the observations on the basis of general principles (symmetry, reciprocity, and reversibility) and conclude that the extreme optical chirality is determined by the chiral localized plasmonic resonances. (C) 2014 AIP Publishing LLC.
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