Plasmon dephasing and macroscopic polarization conversion in single nanoporous particles

Pritam Khan, Grace Brennan, Syed A.M. Tofail, Ning Liu, Christophe Silien

Research output: Contribution to journalConference articlepeer-review

Abstract

Plasmon damping strongly affects their temporal and spectral behaviour and determines their ability to enhance the characteristics of metamaterials tailored to a wide range of applications, including electric-field enhancement, hotelectron injection, and sensing. Coupled and mesoscopic plasmonic systems having complex spectra generally impede damping analysis. As such, we report that polarimetric dark-field microscopy with an incident circular polarized laser is sensitive to the plasmon dephasing and also unambiguously records the change in damping induced upon adsorption of molecules. We validate the relationship with finite element analysis and experiments on gold nanoparticles and silvered nanoporous silica particles. Remarkably, after molecular adsorption, the nanostructured particles scatter with a polarization plane rotated by 90 degrees, when analyzed with a quarter-wave plate and linear polarizer together. These results offer new perspectives in molecule sensing and materials tunability for light polarization conversion at sub-microscopic scale.

Original languageEnglish
Pages (from-to)260-261
Number of pages2
JournalInternational Conference on Metamaterials, Photonic Crystals and Plasmonics
Publication statusPublished - 2021
Event11th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META 2021 - Warsaw, Poland
Duration: 20 Jul 202123 Jul 2021

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