Abstract
Ag nanorods (Ag NRs) with a mean aspect ratio of 3.9 were prepared through a wet-chemical method, and the absorption spectra for various aspect ratios were obtained. The morphology transformation of Ag NRs irradiated with a femtosecond pulse laser was investigated through transmission electron microscopy (TEM). The near-field ablation was dependent on the laser polarization and wavelength. Laser-induced high electric field intensity was observed at the ends, middle, and junctions of the Ag NRs under various ablation conditions. Through simulation, the evolution mechanism was analyzed in detail. The effect of laser polarization angle on plasmonic junction welding was also investigated. By controlling the electronic field distribution, several nanostructures were obtained: bone-shaped NRs, T-shaped NRs, dimers, trimers, curved NRs, and nanodots. This study suggests a potentially useful approach for the reshaping, cutting, and welding of nanostructures.
Highlights
Because of their wide range of potential applications in biomedicine [1,2], analytical chemistry [3,4], and photovoltaics [5], plasmonic nanoparticle research is an attractive field [6,7,8]
The end of shows a transmission electron microscopy (TEM) image of Ag nanorods (Ag NRs) after plasmon-induced melting at parallel polarization
The end of the the Ag NR had melted into a spherical structure with a diameter of 50 nm
Summary
Because of their wide range of potential applications in biomedicine [1,2], analytical chemistry [3,4], and photovoltaics [5], plasmonic nanoparticle research is an attractive field [6,7,8]. Conducted a pulsed laser ablation experiment using a laser at wavelength of 355 nm, and concluded that NPs were fragmented layer by layer under the photothermal effect [18]. The modification of various substrates laser-induced near-field ablationexcitation has been widely plasmonic field enhancement has beenthrough proposed; this process would be nonthermal theHowever, ablation temperature is lower than theNPs melting point [23,24]. In most research, the have completely destroyed andthat removed from photomechanical effect can result in ablation without a thermal phase transformation, and the the substrates after a single high-intensity pulse. Fabricating nanostructures, we demonstrated the dependence the near-field distribution on laser wavelength and polarization including bone-shaped. By performing a femtosecond pulse laser ablation experiment, achieving Ag NRs morphology control by tuning the electronic field distribution.
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