Journal
NANO LETTERS
Volume 13, Issue 3, Pages 1203-1209Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl304638a
Keywords
Gold nanoparticles; surface plasmon resonance; chirality; circular dichroism; biosensing
Categories
Funding
- Israel Science Foundation [172/10]
- James Frank program on light-matter interaction
- NSF (USA)
- Tel Aviv University Center for Nanoscience and Nanotechnology
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0933415] Funding Source: National Science Foundation
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Chiral molecules are shown to induce circular dichroism (CD) at surface plasmon resonances of gold nanostructures when in proximity to the metal surface without direct bonding to the metal. By changing the molecule-Au separation, we were able to learn about the mechanism of plasmonic CD induction for such nanostructures. It was found that even two monolayers of chiral molecules can induce observable plasmonic CD, while without the presence of the plasmonic nanostructures their own CD signal is unmeasurable. Hence, plasmonic arrays could offer a route to enhanced sensitivity for chirality detection.
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