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Preparing Large-aspect-ratio Prolate Metal Nanoparticles in Glass by Simultaneous Femtosecond Multicolor Irradiation by A. Stalmashonak; C. Matyssek; O. Kiriyenko; W. Hergert; H. Graener; G. Seifert is a Engineering article available to read on EtoBox.

What is Preparing Large-aspect-ratio Prolate Metal Nanoparticles in Glass by Simultaneous Femtosecond Multicolor Irradiation about?

By irradiating spherical metal nanoparticles embedded in glass with several hundred ultrashort laser pulses at peak intensities of 0.2-1.5 TWcm(2), dichroic microstructures can be written in these nanocomposite materials. The underlying mechanism is transformation of the nanoparticles to prolate shapes. Using a single wavelength, the maximum aspect ratio achievable with this process is limited by partial destruction of particles. Here we show that this limitation can be overcome by simultaneous irradiation with different wavelengths. In particular, adding a relatively weak intensity at 800 nm to the main irradiation at 532 nm increases the maximum aspect ratio of Ag nanoparticles and the resulting separation between polarized surface plasmon bands dramatically. These effects are explained by the efficiency of electric field enhancement in the vicinity of nanoparticles, which influences the directed photoionization needed for particle shape transformation.

Who reads Preparing Large-aspect-ratio Prolate Metal Nanoparticles in Glass by Simultaneous Femtosecond Multicolor Irradiation?

Author

A. Stalmashonak; C. Matyssek; O. Kiriyenko; W. Hergert; H. Graener; G. Seifert

Publisher

Optica Publishing Group

Published

2010

Language

EN

Field

Engineering (Physical Sciences)