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A plasmon ruler based on nanoscale photothermal effect
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.
2013 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, no 1, 172-181 p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
Gold Nanoparticles, Metal Nanoparticles, Nanostructures, Heat, Resonances, Particles, Cancer
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-118203DOI: 10.1364/OE.21.000172ISI: 000315988100039Scopus ID: 2-s2.0-84872693221OAI: oai:DiVA.org:kth-118203DiVA: diva2:605149
Funder
Swedish Foundation for Strategic Research Swedish Research Council
Note

QC 20130213

Available from: 2013-02-13 Created: 2013-02-13 Last updated: 2017-12-06Bibliographically approved

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