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 language | English (US) |
|---|---|
| Pages (from-to) | 4347-4352 |
| Number of pages | 6 |
| Journal | Nano letters |
| Volume | 8 |
| Issue number | 12 |
| DOIs | |
| State | Published - Dec 1 2008 |
| Externally published | Yes |
Fingerprint
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 journal › Article
}
TY - JOUR
T1 - Noble metal nanoparticle Pairs
T2 - Effect of medium for enhanced nanosensing
AU - Jain, Prashant K.
AU - El-Sayed, Mostafa A.
PY - 2008/12/1
Y1 - 2008/12/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=61649094697&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=61649094697&partnerID=8YFLogxK
U2 - 10.1021/nl8021835
DO - 10.1021/nl8021835
M3 - Article
C2 - 19367968
AN - SCOPUS:61649094697
VL - 8
SP - 4347
EP - 4352
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 12
ER -