Single Particle Deformation and Analysis of Silica-Coated Gold Nanorods before and after Femtosecond Laser Pulse Excitation | Zendy

Wiebke Albrecht | Zendy; TianSong Deng | Zendy; Bart Goris | Zendy; Marijn A. van Huis | Zendy; Sara Bals | Zendy; Alfons van Blaaderen | Zendy

Open Access

Single Particle Deformation and Analysis of Silica-Coated Gold Nanorods before and after Femtosecond Laser Pulse Excitation

Author(s) -

Wiebke Albrecht,

TianSong Deng,

Bart Goris,

Marijn A. van Huis,

Sara Bals,

Alfons van Blaaderen

Publication year - 2016

Publication title -

nano letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.853

H-Index - 488

eISSN - 1530-6992

pISSN - 1530-6984

DOI - 10.1021/acs.nanolett.5b04851

Subject(s) - materials science , nanorod , plasmon , femtosecond , surface plasmon resonance , rod , optics , laser , particle (ecology) , excitation , molecular physics , optoelectronics , nanotechnology , nanoparticle , chemistry , physics , medicine , oceanography , alternative medicine , pathology , geology , quantum mechanics

We performed single particle deformation experiments on silica-coated gold nanorods under femtosecond (fs) illumination. Changes in the particle shape were analyzed by electron microscopy and associated changes in the plasmon resonance by electron energy loss spectroscopy. Silica-coated rods were found to be more stable compared to uncoated rods but could still be deformed via an intermediate bullet-like shape for silica shell thicknesses of 14 nm. Changes in the size ratio of the rods after fs-illumination resulted in blue-shifting of the longitudinal plasmon resonances. Two-dimensional spatial mapping of the plasmon resonances revealed that the flat side of the bullet-like particles showed a less pronounced longitudinal plasmonic electric field enhancement. These findings were confirmed by finite-difference time-domain (FDTD) simulations. Furthermore, at higher laser fluences size reduction of the particles was found as well as for particles that were not completely deformed yet.

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