期刊
NANO LETTERS
卷 16, 期 8, 页码 4887-4894出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01404
关键词
Magneto-plasmonics; chiral plasmonics; chiroptical switch; nanorheology
类别
资金
- Max Planck-EPFL center for molecular nanoscience and technology
- European Research Council under the ERC [278213]
- European Research Council (ERC) [278213] Funding Source: European Research Council (ERC)
Nanoplasmonic systems are valued for their strong optical response and their small size. Most plasmonic sensors and systems to date have been rigid and passive. However, rendering these structures dynamic opens new possibilities for applications. Here we demonstrate that dynamic plasmonic nanoparticles can be used as mechanical sensors to selectively probe the rheological properties of a fluid in situ at the nanoscale and in microscopic volumes. We fabricate chiral magneto-plasmonic nanocolloids that can be actuated by an external magnetic field, which in turn allows for the direct and fast modulation of their distinct optical response. The method is robust and allows nanorheological measurements with a mechanical sensitivity of similar to 0.1 cP, even in strongly absorbing fluids with an optical density of up to OD similar to 3 (similar to 0.1% light transmittance) and in the presence of scatterers (e.g., 50% v/v red blood cells).
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