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This work is devoted to the study of displacement fluctuations ofmicron-sized particles in an aging colloidal glass. We address the issue of thevalidity of the fluctuation dissipation theorem (FDT) and the time evolution ofviscoelastic properties during aging of aqueous suspensions of a clay (LaponiteRG) in a colloidal glass phase. Given the conflicting results reported in theliterature for different experimental techniques, our goal is to check andreconcile them using \emph{simultaneously} passive and active microrheologytechniques. For this purpose we measure the thermal fluctuations of micro-sizedbrownian particles immersed in the colloidal glass and trapped by opticaltweezers. We find that both microrheology techniques lead to compatible resultseven at low frequencies and no violation of FDT is observed. Severalinteresting features concerning the statistical properties and the long timecorrelations of the particles are observed during the transition.

Experimental study of out of equilibrium fluctuations in a colloidal suspension of Laponite using optical traps