Abstract
We have studied the absorption of 100 fs, 806 nm laser pulses in both bulk and nanoparticulate forms of copper as a function of the electric field intensity as well as polarization. In particular, we have investigated the changes in absorption over a wide range of intensity (over four orders of magnitude) which enables us to study the transition of a metal to plasma. We have found that, even in its nanoparticulate form, the onset of plasma formation occurs in copper when the incident light field intensity is about 1014 Wcm-2. The values of the dielectric permittivities, calculated using the Drude theory, deviate from the room temperature values beyond the onset of plasma formation.
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Rajeev, P.P., Sengupta, S., Das, A. et al. Laser absorption in short-lived metal and nanoplasmas. Appl. Phys. B 80, 1015–1019 (2005). https://doi.org/10.1007/s00340-005-1827-0
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DOI: https://doi.org/10.1007/s00340-005-1827-0