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Wavelength-dependent Photothermal Imaging Probes Nanoscale Temperature Differences Among Sub-diffraction Coupled Plasmonic Nanorods by Jebeli, Seyyed Ali Hosseini; West, Claire A.; Lee, Stephen A.; Goldwyn, Harrison J.; Bilchak, Connor R.; Fakhraai, Zahra; Willets, Katherine A.; Link, Stephan; Masiello, David J. is a scholarly article available to read on EtoBox.

What is Wavelength-dependent Photothermal Imaging Probes Nanoscale Temperature Differences Among Sub-diffraction Coupled Plasmonic Nanorods about?

While the thermal and electromagnetic properties of plasmonic nanostructures are well understood, nanoscale thermometry still presents an experimental and theoretical challenge. Plasmonic structures can confine electromagnetic energy at the nanoscale, resulting in local, inhomogeneous, controllable heating. But reading out the temperature with nanoscale precision using optical techniques poses a difficult challenge. Here we report on the optical thermometry of individual gold nanorod trimers that exhibit multiple wavelength-dependent plasmon modes resulting in measurably different local temperature distributions. Specifically, we demonstrate how photothermal microscopy encodes different wavelength-dependent temperature profiles in the asymmetry of the photothermal image point spread function. These point spread function asymmetries are interpreted through companion numerical simulations of the photothermal images to reveal how differing thermal gradients within the nanorod trimer can be controlled by exciting its hybridized plasmonic modes. We also find that hybrid plasmon modes that are optically dark can be excited by our focused laser beam illumination geometry at certain beam p

Author

Jebeli, Seyyed Ali Hosseini; West, Claire A.; Lee, Stephen A.; Goldwyn, Harrison J.; Bilchak, Connor R.; Fakhraai, Zahra; Willets, Katherine A.; Link, Stephan; Masiello, David J.

Published

2021

Language

EN