Noble metal nanoparticle Pairs: Effect of medium for enhanced nanosensing

Prashant K. Jain, Mostafa A. El-Sayed

Research output: Contribution to journalArticle

Abstract

In this Letter, we show using both a quasi-static model and discrete dipole approximation simulations of nanoparticle pairs that the surface plasmon resonance shift resulting from the electromagnetic coupling between noble metal nanoparticles increases with an increase in the dielectric constant of the medium. As the particle pair partners approach each other, there is an increase in the rate at which the plasmon resonance shifts in response to a medium refractive index change. Thus, the surface plasmon resonance of a plasmonic nanoparticle pair exhibits higher sensitivity to the environment/medium refractive index as compared to an isolated nanoparticle. The medium sensitivity of the particle pair is shown to increase near exponentially with a decrease in the interparticle separation between the nanoparticles. We therefore propose that enhanced plasmon resonance nanosensing may be achieved by employing coupled particles instead of colloids or arrays of noninteracting particles.

Original languageEnglish (US)
Pages (from-to)4347-4352
Number of pages6
JournalNano letters
Volume8
Issue number12
DOIs
StatePublished - Dec 1 2008
Externally publishedYes

Fingerprint

Metal nanoparticles
Precious metals
noble metals
Nanoparticles
nanoparticles
Surface plasmon resonance
Particles (particulate matter)
Refractive index
surface plasmon resonance
Electromagnetic coupling
refractivity
Colloids
electromagnetic coupling
static models
sensitivity
shift
Permittivity
colloids
permittivity
dipoles

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Noble metal nanoparticle Pairs : Effect of medium for enhanced nanosensing. / Jain, Prashant K.; El-Sayed, Mostafa A.

In: Nano letters, Vol. 8, No. 12, 01.12.2008, p. 4347-4352.

Research output: Contribution to journalArticle

Jain, Prashant K. ; El-Sayed, Mostafa A. / Noble metal nanoparticle Pairs : Effect of medium for enhanced nanosensing. In: Nano letters. 2008 ; Vol. 8, No. 12. pp. 4347-4352.
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