University of Limerick
Khan_2022_Circular.pdf (3.47 MB)

Circular polarization conversion in single plasmonic spherical particles

Download (3.47 MB)
journal contribution
posted on 2023-08-22, 07:38 authored by Pritam KhanPritam Khan, Grace Brennan, Zhe LiZhe Li, Luluh Al HassanLuluh Al Hassan, Daragh Rice, Matthew Gleeson, Aladin A. Mani, SYED ANSAR TOFAILSYED ANSAR TOFAIL, Hongxing Xu, NING LIUNING LIU, Christophe SilienChristophe Silien

Temporal and spectral behaviors of plasmons determine their ability to enhance the characteristics of metamaterials tailored to a wide range of applications, including electric-field enhancement, hot-electron injection, sensing, as well as polarization and angular momentum manipulation. We report a dark-field (DF) polarimetry experiment on single particles with incident circularly polarized light in which gold nanoparticles scatter with opposite handedness at visible wavelengths. Remarkably, for silvered nanoporous silica microparticles, the handedness conversion occurs at longer visible wavelengths, only after adsorption of molecules on the silver. Finite element analysis (FEA) allows matching the circular polarization (CP) conversion to dominant quadrupolar contributions, determined by the specimen size and complex susceptibility. We hypothesize that the damping accompanying the adsorption of molecules on the nanostructured silver facilitates the CP conversion. These results offer new perspectives in molecule sensing and materials tunability for light polarization conversion and control of light spin angular momentum at submicroscopic scale.


Nonlinear optical micro-spectroscopy for multiplex suspension immunoassay

Science Foundation Ireland

Find out more...

Electrically pumped all-inorganic LEDs and lasers by colloidal nanorod heterogeneous assembly

Science Foundation Ireland

Find out more...

CÚRAM - Centre for Research in Medical Devices

Science Foundation Ireland

Find out more...



Nano Letters. 22, 4, pp.1504–1510


American Chemical Society

Other Funding information

Irish Research Council GOIPD/2018/716

Also affiliated with

  • Bernal Institute

Department or School

  • Physics

Usage metrics

    University of Limerick


    Ref. manager