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Journal of Luminescence

Spectrally selective molecular doped solids: spectroscopy, photophysics and their application to ultrafast optical pulse processing

Jean‐Pierre Galaup

Published Dec 15, 2004• 4 citations
Publisher
DOI
10.1016/j.jlumin.2004.09.109

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An overview of recent results concerning molecular doped solids is presented. The hole burning performances and the photophysics of polymer and xerogel-based systems are compared. Three areas are considered in more detail: the problem of electron-phonon coupling, the one of high-temperature persistent spectral hole burning materials, and the search for new frequency-selective photosensitive systems for fast optical pulse processing at 800 nm. This comparison demonstrates that molecular doped polymers and molecular doped xerogels have similar hole burning behavior but mechanisms in these systems can be different. However, in respect of the areas considered, inorganic hosts based on silicate xerogels or porous glasses have shown the best results. Moreover, all the possibilities of hybrid xerogels created by combining inorganic and organic capabilities or by grafting organic species to the host have not yet been revealed.
The persistent spectral hole-burning (PSHB) phenomenon has been known since 1974. It is still an important research area for the study of the intimacy of complex molecular systems in the solid state, revealing high-resolution spectra, photophysics, photochemistry, and dynamics of molecular doped amorphous media, organic as well as inorganic. From another point of view, PSHB allows the engraving of any spectral structures in the inhomogeneous absorption band profile of molecular doped amorphous hosts or ion doped crystals cooled down to liquid helium temperatures. Therefore, a PSHB material is programmable in the spectral domain and consequently it can be transformed in an optical processor capable of achieving user-defined optical functions. Some aspects of both fields are illustrated in the present paper. Concerning the search for efficient PSHB materials, the hole-burning performances and the photophysics of polymer and xerogel based systems are compared. The problem of high-temperature persistent spectral hole-burning materials and the search for new frequency selective photosensitive systems for fast optical pulse processing at 800nm are considered. Regarding the points treated, inorganic hosts based on silicate xerogels or porous glasses have shown the best results. Moreover, by combining inorganic and organic capabilities or by grafting organic species to the host, hybrid xerogels have not yet revealed all possibilities. Also, the interest of two-photon materials for engraving spectral features with near-infrared or infrared light is developed. As an introduction to possible applications of PSHB material, the basics of spectro-temporal holography are remembered and a demonstrative experiment using a naphthalocyanine-doped polymer film is described, proving that the temporal aberration free recompression of ultrashort light pulses is feasible, therefore opening a way for applications in ultrashort light pulse shaping. Aspects for a comparison between cw hole-burning and femtosecond spectro-temporal experiments are considered, and prospects for coherent control of light fields or photochemical processes are also evoked.
Fundamental interactions leading to energy transfer, B. Di Bartolo energy transfer processes in atoms and molecules, W. Demtroder et al advances in the techniques for the study of energy transfer, D. Hulin upconversion phenomena with laser applications, X. Chen new applications of ultrafast spectroscopy, J.M. Hvam efficient solid state lasers, N.P. Barnes emission efficiency and energy transfer in colour centres at high concentrations, G. Baldacchini four-wave mixing studies of energy transfer processes, G. Boulon upconventional light emissions in rare-earth doped solids, F. Auzel photonic molecular and supramolecular devices, J.M. Lehn reflections on the theory of everything, G. Costa earthquakes, measurements, and mitigation of seismic risk, R. Console site selectivity of defects in III-V compounds by local mode spectroscopy and model calculations, D.N. Talwar the general non-radiative energy transfer master equations for crystalline materials, the exact solution and current modelling, L.A. Diaz-Torres et al and other papers.