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RESEARCH PRODUCT

Plasmonic Focusing Reduces Ensemble Linewidth

Jan Becker

subject

PhysicsWavelengthLaser linewidthCondensed matter physicsParticle-size distributionPhysics::Atomic and Molecular ClustersPhysics::OpticsParticleNanorodSurface plasmon resonanceResonance (particle physics)Plasmon

description

In this chapter I present an effect the coating of gold nanorods with a silver shell is evocating: a reduction of the ensemble plasmon linewidth by changing the plasmon-shape relation, which connects the particle shape with its plasmon resonance wavelength. This change, we term “plasmonic focusing” (Sect. 10.2), leads to less variation of resonance wavelengths for the same particle size distribution. Section 10.3 explains the effect of increasing single particle linewidth during the coating process, which is therefore not the reason for the observed ensemble linewidth decrease. This is rather a result from a change in the plasmon-shape relation explained in Sect. 10.4. Using a simple model, the effect of the single particle linewidth can be subtracted from the ensemble linewidth, showing the plasmonic focusing effect is even larger than the measured ensemble linewidth decrease (Sect. 10.5) The discovery and explanation of this effect was performed in collaboration with Inga Zins and the results were published in reference Becker et al. (2008).

https://doi.org/10.1007/978-3-642-31241-0_10