期刊
NANO LETTERS
卷 12, 期 5, 页码 2357-2361出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl300316f
关键词
Nanohole arrays; extrinsic chirality; plasmonic nanostructures; circular dichroism; 2D chirality
类别
资金
- Israel Science Foundation [172/10]
- James Frank program on light-matter interaction
- Tel Aviv University Center for Nanoscience and Nanotechnology
Chiroptical effects are routinely observed in three dimensional objects lacking mirror symmetry or quasi-two-dimensional thin films lacking in-plane mirror symmetry. Here we show that symmetric plasmonic planar arrays of circular nanoholes produced strong chiroptical responses at visible wavelengths on tilting them with respect to the incident light beam due to the collective asymmetric nature of their surface plasmon excitations. This extrinsic chiroptical effect can be stronger than the local chiroptical response in arrays of intrinsically chiral nanoholes and may be useful for chiral sensing and negative refraction.
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