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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Studies on an optical memory effect in doped gel matrices

F.F.L. Bentivegna, Michael Canva, Alain Brun, Fréderic Chaput

Published Aug 24, 2005• 0 citations
Publisher
DOI
10.1109/cleoe.1994.635808

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The Journal of Chemical Physics•Dec 8, 1995•1 citation
We show that including highly polarizable dopants in the pores of a xerogel matrix leads to interesting optical properties and applications, such as an all-optical molecular memory device. By submitting the sample to ultrashort linearly polarized optical pulses, we demonstrate that the dopants tend to align along the direction of the electric field of the optical wave like in classical optical Kerr effect, and that the new alignment of the molecules is partially maintained. We study the influence of the matrix-dopant interactions on this phenomenon. For example, for rhodamine-like molecules, we establish that the alignment ability as well as the relaxation times depend strongly on the structure of the gel network and on the coupling intensity between the host matrix and the guest molecule.
We have studied the behavior of organic molecules (Rhodamine 640) that are encaged in a matrix synthesized by the sol-gel process. By applying a strong optical-polarized electric field, we can control the alignment of the molecules within the sample and locally create a birefringent effect. Using this sample in a Kerr experiment, we obtained a transmission ratio of 6%. Since the birefringent effect lasts at least several days, this type of sample could be used in an optical process for storage of information. Moreover, we show that such information can be deleted and rewritten repetitively.
Temperature-dependent (1.2–2.1 K) photon echo measurements have been performed on quinizarin and rhodamine 101 doped into aluminosilica sol-gel glasses as well as rhodamine 101 doped poly-methyl-methacrylate (PMMA) polymer. We observe a temperature-dependent homogeneous linewidth for both quinizarin and rhodamine in the aluminosilica xerogel (ASX) matrix proportional to T2, in contrast to the T1.3±0.1 linewidth dependence typically observed for a variety of organic and inorganic glass hosts in this temperature range (including rhodamine 101 doped PMMA). The contrasting optical dephasing results for the ASX glass and PMMA suggest that the ASX glass may have unique two-level-system dynamics.