Saturable and reverse saturable absorption in silver nanodots at 532 nm using picosecond laser pulses

Ullas Gurudas, Elijah Brooks, Daniel M. Bubb, Sebastian Heiroth, Thomas Lippert, Alexander Wokaun

Research output: Contribution to journalArticlepeer-review

111 Scopus citations

Abstract

Saturable absorption (SA) and reverse saturable absorption (RSA) at 532 nm were observed in Ag nanodots prepared by pulsed laser deposition. The real [Re χ(3)] and imaginary [Im χ(3)]] parts of the third order nonlinearity of these films were measured using the Z -scan technique. At low input irradiances, the decrease in absorption near the focal point results from a negative Im χ(3)] and yields SA. At higher input irradiance, RSA becomes dominant. The transition from SA to RSA suggests that there is a threshold irradiance at which additional nonlinear process(es) is (are) involved and become dominant. The recovery time of these nonlinear processes was measured by a degenerate pump-probe experiment. The effects are explained in terms of the electron dynamics in the excited states.

Original languageEnglish (US)
Article number073107
JournalJournal of Applied Physics
Volume104
Issue number7
DOIs
StatePublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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