Molecular active plasmonics: Controlling plasmon resonances with molecular machines

Yue Bing Zheng, Ying Wei Yang, Lasse Jensen, Lei Fang, Bala Krishna Juluri, Amar H. Flood, Paul S. Weiss, J. Fraser Stoddart, Tony Jun Huang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The paper studies the molecular-level active control of localized surface plasmon resonances (LSPRs) of Au nanodisk arrays with molecular machines. Two types of molecular machines - azobenzene and rotaxane - have been demonstrated to enable the reversible tuning of the LSPRs via the controlled mechanical movements. Azobenzene molecules have the property of trans-cis photoisomerization and enable the photo-induced nematic (N)-isotropic (I) phase transition of the liquid crystals (LCs) that contain the molecules as dopant. The phase transition of the azobenzene-doped LCs causes the refractive-index difference of the LCs, resulting in the reversible peak shift of the LSPRs of the embedded Au nanodisks due to the sensitivity of the LSPRs to the disks' surroundings' refractive index. Au nanodisk array, coated with rotaxanes, switches its LSPRs reversibly when it is exposed to chemical oxidants and reductants alternatively. The correlation between the peak shift of the LSPRs and the chemically driven mechanical movement of rotaxanes is supported by control experiments and a time-dependent density functional theory (TDDFT)-based, microscopic model.

Original languageEnglish (US)
Title of host publicationPlasmonics
Subtitle of host publicationNanoimaging, Nanofabrication, and their Applications V
DOIs
StatePublished - Nov 18 2009
EventPlasmonics: Nanoimaging, Nanofabrication, and their Applications V - San Diego, CA, United States
Duration: Aug 2 2009Aug 6 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7395
ISSN (Print)0277-786X

Other

OtherPlasmonics: Nanoimaging, Nanofabrication, and their Applications V
CountryUnited States
CitySan Diego, CA
Period8/2/098/6/09

Keywords

  • Au nanodisks, liquid crystals
  • Azobenzenes
  • Localized surface plasmon resonances
  • Molecular active plasmonics
  • Molecular machines
  • Molecular plasmonics
  • Plasmonics
  • Rotaxanes
  • Time-dependent density functional theory

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Zheng, Y. B., Yang, Y. W., Jensen, L., Fang, L., Juluri, B. K., Flood, A. H., Weiss, P. S., Stoddart, J. F., & Huang, T. J. (2009). Molecular active plasmonics: Controlling plasmon resonances with molecular machines. In Plasmonics: Nanoimaging, Nanofabrication, and their Applications V [73950W] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7395). https://doi.org/10.1117/12.824525