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Charge‐Induced Shifts in Chiral Surface Plasmon Modes in Gold Nanorod Assemblies
Author(s) -
Kumar Jatish,
LópezMartínez Elena,
Cortajarena Aitziber L.,
Solís Diego M.,
Taboada José M.,
DíezBuitrago Beatriz,
Pavlov Valeri,
LizMarzán Luis M.
Publication year - 2019
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201800368
Subject(s) - nanorod , plasmon , surface plasmon , blueshift , materials science , electron , localized surface plasmon , surface plasmon polariton , molecular physics , surface plasmon resonance , electron density , optoelectronics , nanotechnology , optics , chemistry , nanoparticle , physics , photoluminescence , quantum mechanics
A detailed investigation of the effect of electron injection on the chiral plasmon modes of helical nanorod assemblies is presented. An increased surface plasmon frequency of the electron gas due to the addition of electrons leads to a blue‐shift in the corresponding chiral surface plasmon modes. The mechanism behind the shift in plasmonic chirality due to nanorod charging is investigated using theoretical simulations. Charging of the nanorods alters the surface electron density, thereby modifying the plasma frequency and causing a change in the dielectric function. The nature of the plasmon shift and the intensity of chiral surface plasmons are found to be largely dependent on the extent of electron addition. At extended periods of time, the blue shifted band slowly shifts back toward the red, due to transfer of electrons back to the medium, leading to discharging of the nanorods.