Nonlinear optics has been the subject of intensive research because of its wide applications in field of photonics, nanophotonics [1] and optoelectroncs such as optical signal processing, broad-band optical communicat...
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Nonlinear optics has been the subject of intensive research because of its wide applications in field of photonics, nanophotonics [1] and optoelectroncs such as optical signal processing, broad-band optical communications, integrated optics, optical sensing, optical poling, optical limiting, optical computing etc. A common problem in the laser technology is the protection of human eye and optical sensors from the damaging effects of high-energy light. Passive optical limiters can be the solution of this kind of *** optical materials with large coefficients of TPA and nonlinear refraction are of prime importance in optical limiting applications. Recently the C_ 60-TTF have attracted much attention because of their three-dimensional π-electron conjugated systems which makes them promising as new limiting materials [2]. Two-photon absorption, second harmonic generation (SHG), detection of phase transition using photoinduced nonlinear effects and illustration of new system for optical recording and erasing of holograms under weak laser illumination will be discussed. In other hand a series of new Donor-π-Acceptor ruthenium acetylide systems built around thiophene-based π-conjugating spacers has been developed and studied, in terms of the oligothienyl chain length. Comparison of the linear and third-order nonlinear optical properties of these Donor-π-Acceptor chromophores shows that the elongation of the spacer and introduction of a double bond in this spacer produces a considerable bathochromic shift of the absorption maximum together with a dramatic enhancement of the molecular cubic hyperpolarizability in these systems. Finally, acoustically induced second harmonic generation (AISHG) has been observed for thin films of these complexes incorporated in PMMA matrices, which reaches values among the highest, reported so far.
作者:
B. SahraouiZ. SofianiA. Migalska-ZalasI. V. KitykS.W. TkaczykJ. BerdowskiJ.-L. Fillaut3J. PerruchonLaboratoire POMA
UMR CNRS 6136 Université d'Angers. 2 Boulevard Lavoisier 49045 Angers Cedex FranceLaboratoire POMA UMR CNRS 6136 Université d'Angers. 2 Boulevard Lavoisier 49045 Angers Cedex FranceLaboratoire POMA UMR CNRS 6136 Université d'Angers. 2 Boulevard Lavoisier 49045 Angers Cedex FranceInstitute of Physics WSP Al. Armii Krajowej 13/15 PL-42201 Czestochowa PolandInstitute of Physics WSP Al. Armii Krajowej 13/15 PL-42201 Czestochowa PolandInstitute of Physics WSP Al. Armii Krajowej 13/15 PL-42201 Czestochowa PolandInstitut de Chimie de Rennes Université de Rennes I UMR CNRS 6509Laboratoire Organométalliques et Catalyse 35042 Rennes Cedex France
Nonlinear optics has been the subject of intensive research because of its wide applications in field of photonics, nanophotonics [1] and optoelectroncs such as optical signal processing, broad-band optical communicat...
详细信息
Nonlinear optics has been the subject of intensive research because of its wide applications in field of photonics, nanophotonics [1] and optoelectroncs such as optical signal processing, broad-band optical communications, integrated optics, optical sensing, optical poling, optical limiting, optical computing etc. A common problem in the laser technology is the protection of human eye and optical sensors from the damaging effects of high-energy light. Passive optical limiters can be the solution of this kind of *** optical materials with large coefficients of TPA and nonlinear refraction are of prime importance in optical limiting applications. Recently the C_ 60-TTF have attracted much attention because of their three-dimensional π-electron conjugated systems which makes them promising as new limiting materials [2]. Two-photon absorption, second harmonic generation (SHG), detection of phase transition using photoinduced nonlinear effects and illustration of new system for optical recording and erasing of holograms under weak laser illumination will be discussed. In other hand a series of new Donor-π-Acceptor ruthenium acetylide systems built around thiophene-based π-conjugating spacers has been developed and studied, in terms of the oligothienyl chain length. Comparison of the linear and third-order nonlinear optical properties of these Donor-π-Acceptor chromophores shows that the elongation of the spacer and introduction of a double bond in this spacer produces a considerable bathochromic shift of the absorption maximum together with a dramatic enhancement of the molecular cubic hyperpolarizability in these systems. Finally, acoustically induced second harmonic generation (AISHG) has been observed for thin films of these complexes incorporated in PMMA matrices, which reaches values among the highest, reported so far.
Background:Ocular toxoplasmosis(OT)is the most common etiology of posterior *** high incidence of macular scarring associated with OT is a leading cause of visual *** biomarkers of the disease would aid in its *** wor...
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Background:Ocular toxoplasmosis(OT)is the most common etiology of posterior *** high incidence of macular scarring associated with OT is a leading cause of visual *** biomarkers of the disease would aid in its *** work was designed as a pilot study to detect OT potential ***:Blood samples were collected from four groups of nine patients each;toxoplasmosis IgG-with no history of uveitis,non-toxoplasmosis uveitic,first episode OT,and symptomatic recurrent *** serum was isolated and subjected to proteomics analysis using 2D gel electrophoresis(GE)and surface-enhanced laser desorption ionization mass spectrometry(SELDI-MS).Selected proteins were separated by GE and sequenced using tandem ***:Fifty markers of OT and 46 markers of recurrent disease were discovered by MS;47%were cross-validated;14 biomarkers were selected for verification by 1D-GE.2D-GE analysis yielded 57 differentially expressed bands,20 of which were excised and *** serum protein,peptidyl-prolyl cis-trans isomerase A,was validated to be a biomarker of multi-episodic OT by immunoblotting in patient and control ***:This pilot study sought,for the first time,to elucidate plasma serum biomarkers for *** study demonstrates the potential for SELDI-MS and well as other MS technologies to identify novel disease biomarkers.
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