Active Nanorheology with Plasmonics

Hyeon Ho Jeong, Andrew G. Mark, Tung Chun Lee, Mariana Alarcón-Correa, Sahand Eslami, Tian Qiu, John G. Gibbs, Peer Fischer

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


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 ∼0.1 cP, even in strongly absorbing fluids with an optical density of up to OD ∼ 3 (∼0.1% light transmittance) and in the presence of scatterers (e.g., 50% v/v red blood cells).

Original languageEnglish (US)
Pages (from-to)4887-4894
Number of pages8
JournalNano Letters
Issue number8
StatePublished - Aug 10 2016


  • Magneto-plasmonics
  • chiral plasmonics
  • chiroptical switch
  • nanorheology

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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