Spectroscopy and dynamics of nanometer-sized noble metal particles

Article Abstract:

Femtosecond transient absorption spectroscopic studies were conducted to investigate the electron-phonon relaxation dynamics in nanometer-sized gold and silver (Ag) particles. Simple spectral calculations were combined with two-temperature model for electron-phonon equilibration. The findings showed that strong transient bleach at the peak of the plasmon band are caused by pump-laser-induced heating and that the transient bleach signal for Ag increased after a high pump laser power. Moreover, electron-phonon coupling in small metal particles can only be obtained at low excitation levels.

Spectra, Particles, Optical properties, Particulate matter, Precious metals

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Photophysics of nanometer sized metal particles: electron-phonon coupling and coherent excitation of breathing vibrational modes

Article Abstract:

The photophysics of metal nanoparticles, that include Au particles with sizes ranging from 2nm diameter to 120nm diameter, and bimetallic core-shell particles composed of Au, Ag, Pt and/or Pb are investigated. The findings indicate that for Au the time scale for electron-phonon coupling does not depend on size, in contrast to metals such as Ga and Ag.

Platinum, Silver

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Softening of the symmetric breathing mode in gold particles by laser induced heating

Article Abstract:

Different intensity pump laser pulses are used to examine symmetric breathing mode in spherical gold particles. The results show that the period of the breathing mode increases as the pump laser power increases, up to pump laser powers of 2-3 (mu)J/pulse.

Laser photochemistry

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