Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Photothermal Determination of Absorption and Scattering Spectra of Silver Nanoparticles

Not Accessible

Your library or personal account may give you access

Abstract

This work reports on photothermal lens spectra of silver nanoparticles of different dimensions in the spectral region of 370–730 nm performed using an arc-lamp-based photothermal spectrophotometer. We show that the photothermal and extinction cross-section spectra of the samples are similar for nanoparticles of reduced dimensions where scattering effects are small. The results differ substantially for nanoparticles of a diameter larger than 30 nm for which scattering becomes relevant. We demonstrate that the photothermal spectrum corresponds to the absorption component of the particle’s extinction. Photothermal spectra show a clear picture of the plasmonic peaks of the nanoparticle even in the presence of high scattering. By subtracting the photothermal component from the total extinction, we extract the scattering cross-section spectra of the nanoparticles. The technique allows determination of the absorption and scattering components of the extinction providing a better understanding of the particle’s optical properties. The results agree well with the Mie approximation, which is valid for a single spherical nanoparticle. We discuss and demonstrate the application of the method to characterize particles of arbitrary shape and dimensions.

© 2017 The Author(s)

PDF Article
More Like This
Determination of linear and nonlinear absorption of metallic colloids using photothermal lens spectrometry

A. Marcano O., F. Delima, Y. Markushin, and N. Melikechi
J. Opt. Soc. Am. B 28(2) 281-287 (2011)

Multi-angle fluorometer technique for the determination of absorption and scattering coefficients of subwavelength nanoparticles

Matthew P. Shortell, Rodney A. Hewins, Joseph F. S. Fernando, Sarah L. Walden, Eric R. Waclawik, and Esa A. Jaatinen
Opt. Express 24(15) 17090-17102 (2016)

Scattering of light into silicon by spherical and hemispherical silver nanoparticles

Anthony Centeno, Jonathan Breeze, Badar Ahmed, Hari Reehal, and Neil Alford
Opt. Lett. 35(1) 76-78 (2010)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved