A plasmon ruler based on nanoscale photothermal effect
2013 (English)In: Optics Express, ISSN 1094-4087, Vol. 21, no 1, 172-181 p.Article in journal (Refereed) Published
The determination of nanoscale distances or distance changes necessitates a nanoscale ruler. In the present paper, distance dependence of particle temperature in an optically heated gold nanoparticle pair is quantitatively investigated to explore the possibility of creating a Plasmon ruler based on this effect. The two origins of the distance-dependence, i.e., electromagnetic coupling and thermal accumulative effect, are studied. For the particle temperature, a scaling behavior is found, and it suggests that the decay of particle temperature with the interparticle gap for different particle sizes follows a common exponential decay equation. This scaling behavior is qualitatively explained with a simple dipolar-coupling model combined with a point heat source interaction model. On the basis of this scaling behavior of absorption power, we further establish a plasmon ruler equation relating the particle temperature and the interparticle distance. Our findings can serve as an excellent guideline for designing and optimizing temperature-based plasmon rulers.
Place, publisher, year, edition, pages
2013. Vol. 21, no 1, 172-181 p.
Gold Nanoparticles, Metal Nanoparticles, Nanostructures, Heat, Resonances, Particles, Cancer
Other Physics Topics
IdentifiersURN: urn:nbn:se:kth:diva-118203DOI: 10.1364/OE.21.000172ISI: 000315988100039ScopusID: 2-s2.0-84872693221OAI: oai:DiVA.org:kth-118203DiVA: diva2:605149
FunderSwedish Foundation for Strategic Research Swedish Research Council
QC 201302132013-02-132013-02-132013-08-28Bibliographically approved