期刊
NANO LETTERS
卷 16, 期 1, 页码 663-670出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04416
关键词
Optical antennas; metasurfaces; SNOM; near-field microscopy; plasmonics; optical chirality
类别
资金
- European Union through ERC starting grants (TERATOMO) [258461]
- Spanish Ministry of Economy and Competitiveness [MAT2012-36580, MAT2012-37638, FIS2013-41184P]
- Basque Government (project ETORTEK nanogune'14) [PI2011-1]
- Office of Naval Research [N00014-13-1-0837]
Chiral antennas and metasurfaces can be designed to react differently to left- and right-handed circularly polarized light, which enables novel optical properties such as giant optical activity and negative refraction. Here, we demonstrate that the underlying chiral near-field distributions can be directly mapped with scattering-type scanning near-field optical microscopy employing circularly polarized illumination. We apply our technique to visualize, for the first time, the circular-polarization selective nanofocusing of infrared light in Archimedean spiral antennas, and explain this chiral optical effect by directional launching of traveling waves in analogy to antenna theory. Moreover, we near-field image single-layer rosette and asymmetric dipole-monopole metasurfaces and find negligible and strong chiral optical near-field contrast, respectively. Our technique paves the way for near-field characterization of optical chirality in metal nanostructures, which will be essential for the future development of chiral antennas and metasurfaces and their applications.
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