All-optical gel memory

Canva, Michael; Saux, G. Le; Georges, Patrick; Brun, Alain; Chaput, Frédéric; Boilot, Jean‐Pierre

doi:10.1364/ol.17.000218

Cited by 41 publications

(19 citation statements)

References 9 publications

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“…These are indicated in Table 2 as molar concentrations, assuming a typical silica density of 2.0 g/cm 3 . Also shown is the average distance between dye molecules in the particles, defined as where c is the number of molecules per unit volume.…”

Section: Resultsmentioning

confidence: 99%

Spectroscopy of Fluorescein (FITC) Dyed Colloidal Silica Spheres

et al. 1999

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We have measured the absorption spectrum, the emission spectrum, the emission lifetime, and the photostability of fluorescein isothiocyanate (FITC) incorporated inside colloidal silica spheres as a function of the dye concentration in the spheres, while minimizing scattering effects. Six batches of stable, monodisperse particles were synthesized with FITC up to high densities of 0.03 M. At dye concentrations above 0.001 M, we observe a large red shift of 10 nm in the absorption and the emission spectra, as well as a strong reduction of the lifetime. At the same time, the photostability of the dye is considerably improved. These effects are caused by an increased energy transfer between the dye molecules as their concentration increases. Several excitation quenching models are examined, namely annihilation quenching, surface quenching, and a fractal distribution of quenchers. None of the models that assume a homogeneous distribution of FITC provide a sufficient explanation of the observed effects. It is suggested that the dye molecules tend to form clusters during the synthesis of the colloidal spheres. It is concluded that colloids with a low dye concentration are useful for photonic applications, whereas high dye concentrations are interesting for optical experiments in colloid science.

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Section: Resultsmentioning

confidence: 99%

Spectroscopy of Fluorescein (FITC) Dyed Colloidal Silica Spheres

et al. 1999

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“…The difference between the experimental and theoretical results can be explained by the fact that dye molecules are generally not isotropic and their orientation may be fixed 15 by matrix surroundings. If we suppose a random distribution of axial dye molecules fixed in the matrix, the molecules normal to the polarization of incident light are the last to be destroyed.…”

Section: A Dyes In Solid Matricesmentioning

confidence: 88%

Photostability of dye molecules trapped in solid matrices

et al. 1996

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The photostability of dye molecules trapped in transparent solid matrices synthesized by the solgel technique was studied both experimentally and theoretically using a model with numerical and approximate analytical solutions. The model is based on a one-photon photodestruction process with the creation of an absorbing bleached molecule. We give the number of photons that different trapped dye molecules can absorb on average before they are bleached. Dyes such as Perylene Red, Perylene Orange, Pyrromethenes 567 and 597, Rhodamines 6G and B, DCM, a Xanthylium salt, and Neon Red were investigated; significant differences were observed. Some dye molecules in solvents were also studied; increased stability resulted when the molecules were trapped in solid matrices.

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“…Since the first successful attempt to incorporate organic dyes within sol-gel glasses in 1984 [1] many efforts have been devoted for finding new materials, improving and understanding the mechanisms with the aim developing successful applications as laser materials [2], nonlinear optical materials [3], optical memories [4], and other electrooptical materials [6]. light concentrators in solar cells [5].…”

Section: Introductionmentioning

confidence: 99%