Optical and elastic properties of Metal Nanoparticles
23 May 2007Faraday first studied the optical properties of metal particles in solution in 1857 and since then the optical properties of metal is playing a key role in the development of physical chemistry. In the recent past various experiments with metal nanoparticles have been conducted. Gold nanospheres and nanorods of varying sizes were used by the umber of scientists for the study. Nanorods were analyzed for longitudinal and transverse plasmon resonance by UV-vis absorption spectra.
Using ultrafast laser pulse the metal nanoparticles causes rapid increase in the temperature and the hot electron equilibrates with phonon on a several picosecond time scale. The heat thus generated will impulsively excite with the phonon mode. For nanorods the coherently excited phonon mode depends on the length of the rod.
In experimental study for the wavelength dependant transient absorption measurement, it is possible to calculate the radius change with time. The result obtained during experiment was later directly compared to the model where the expansion co-ordinate is a harmonic oscillator. The careful analysis and finding shows that the phase of the modulations shows that both hot electron pressure and lattice heating contribute to the impulsive excitation pressure.
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