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Author

Xingfa Fu

Other affiliations: Academia Sinica
Bio: Xingfa Fu is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Azobenzene & Bistability. The author has an hindex of 4, co-authored 6 publications receiving 41 citations. Previous affiliations of Xingfa Fu include Academia Sinica.

Papers
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Journal ArticleDOI
TL;DR: Low-power phase conjugation of azobenzene-compound-doped poly(methyl methacrylate) films was studied and it was shown that this kind of polymer has appreciable third-order optical nonlinearity.
Abstract: Push–pull azobenzene compounds were synthesized by the diazocoupling reaction, and low-power phase conjugation of azobenzene-compound-doped poly(methyl methacrylate) films was studied with a He–Ne laser at 632.8 nm. It is shown that this kind of polymer has appreciable third-order optical nonlinearity, with a χ(3) of approximately 10−4 esu in the tail of absorption.

15 citations

Journal ArticleDOI
Jiehui Zhao1, F. Dong1, H. Qu1, Peixian Ye1, Xingfa Fu1, Ling Qiu1, Yuquan Shen1 
TL;DR: In this article, the dynamic behaviors of laser-induced gratings through two-photon absorption and single-poton absorption were carried out in an azobenzene-doped PMMA film.
Abstract: Studies on the dynamic behaviours of laser-induced gratings through two-photon absorption and single-photon absorption were carried out in an azobenzene-doped PMMA film. The experimental results exposed the structures of energy levels and the relaxation between them, in which different lifetimes of the triplet states of trans and cis isomers of azobenzene molecule were recognized. The temporal characteristics of the diffracted signal from the induced-gratings showed also the dynamic processes of the photoisomerization reaction between two isomers.

11 citations

Journal ArticleDOI
TL;DR: The low-power and broadband optical bistability in an acceptor-donor-substituted azobenzene-doped polymethyl methacrylate thin film, which relies on the excitation of surface plasmons with a cw laser, is studied experimentally and theoretically.
Abstract: The low-power and broadband optical bistability in an acceptor-donor-substituted azobenzene-doped polymethyl methacrylate thin film, which relies on the excitation of surface plasmons with a cw laser of several tens of milliwatt power, is studied experimentally and theoretically. The observations on the characteristics of the bistability are essentially consistent with the theoretical predictions.

10 citations

Journal ArticleDOI
Hui-Tian Wang1, Peixian Ye1, Ling Qiu1, Xingfa Fu1, Yuquan Shen1 
TL;DR: All-optical bistability was observed in thin-film waveguides made with acceptor-donor substituted azobenzene-doped poly(methyl methacrylate) polymer with nonlinear coupling between a prism and doped-polymer waveguide.
Abstract: All-optical bistability was observed in thin-film waveguides made with acceptor-donor substituted azobenzene-doped poly(methyl methacrylate) polymer. Input-output curves with hysteresis characteristics were measured. The origin of the bistability was attributed to nonlinear coupling between a prism and a doped-polymer waveguide. An approximately theoretical analysis was introduced. Theoretical predictions were qualitatively consistent with experimental results.

4 citations

Journal ArticleDOI
TL;DR: Light-induced noncentrosymmetry was achieved experimentally in acceptor-donor-substituted azobenzene solutions and observed by phase-matched nondegenerate six-wave mixing and the microscopic origin was found to be orientational hole burning.
Abstract: Light-induced noncentrosymmetry was achieved experimentally in acceptor–donor-substituted azobenzene solutions and observed by phase-matched nondegenerate six-wave mixing. The microscopic origin of the induced noncentrosymmetry was found to be orientational hole burning, which was distinguished directly with net orientation of molecules by experimental observations. The decay time of the induced noncentrosymmetry depended on the rotational orientation time of the sample’s molecule, which varied linearly with the viscosity of the solvent.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: The third-order nonlinear performance of pseudo-stilbene type azobenzenes with an eye to application in ultrafast optical signal processing was reviewed in this paper.
Abstract: We review the third-order nonlinear performance of pseudo-stilbene type azobenzenes with an eye to application in ultrafast optical signal processing. We discuss mechanisms responsible for the nonlinear response of the azobenzenes. By aggregating experimental data and theoretical trends reported in the literature, we identify five characteristic regions of optical nonlinear response. Analyzed with respect to Stegeman figures of merit, pseudo-stilbene type azobenzenes show promise for ultrafast optical signal processing in two spectral regions, one lying between the main and two-photon absorption resonances, and the other for wavelengths longer than the two-photon absorption resonance. © 2001 Kluwer Academic Publishers

107 citations

Journal ArticleDOI
TL;DR: In this article, the third-order nonlinear optical response of a thin film containing the azobenzene dye Disperse Red 1 was studied using the z-scan technique with tunable picosecond pulses.
Abstract: The third-order nonlinear optical response of a thin film containing the azobenzene dye Disperse Red 1 was studied using the z-scan technique with tunable picosecond pulses. A nonlinear refractive index of −5.0 cm2/GW, corresponding to a Re χ(3)=−3.0×10−15 m2/V2 (2.1×10−7 esu), has been measured at 570 nm. The observed nonlinearity is attributed to the change in refractive index induced by the trans-cis transition in the dye molecule.

92 citations

Journal ArticleDOI
TL;DR: Azo dye-doped polymer (ADP) systems have been shown to be remarkable photosensitive media for holographic recording and optical computing as mentioned in this paper, which can also be used to perform polarization holographic recordings as they present a photoinduced anisotropy called the Weigert effect.
Abstract: Azo dye-doped polymer (ADP) systems have been shown to be remarkable photosensitive media for holographic recording and optical computing. In this work we have studied the dynamic holographic capabilities of poly(methyl methacrylate) (PMMA) fims doped with five new azo dyes named AZD1-5. The totally reversible trans \rightleftharpoons cis photoisomerization induced by exposure of the ADP samples to actinic light allows recording of holograms in the dye-doped polymer matrices, and diffraction efficiencies up to 10% have been attained. These ADP systems can also be used to perform polarization holographic recordings as they present a photoinduced anisotropy called the Weigert effect. Depending on the intensity of the reading beam, the recorded information can be rapidly erased or stored for a posteriori use. The storage time can be as long as 800 s depending on the azo dye employed. These photosensitive materials can be classified as promising holographic media for optical computing and optical mass storage.

77 citations

Book ChapterDOI
01 Jan 2001
TL;DR: The nonlinear optical effects described in Chaps.
Abstract: The nonlinear optical effects described in Chaps. 4 and 5 have to be characterized for a given material up to a certain level before they can be applied in photonics. The already wide range of applications in science, technology and medicine contains analytic aspects, questions of the structure of matter, reaction mechanisms on all time scales and the production of new states, phases or even of new matter. Thus two main questions are asked in nonlinear optics: Which nonlinear optical effect is, for a given material suitable for a new laser analytic method (analytic tasks)? Which nonlinear optical effect is most suitable for a desired photonic application (material and light modification tasks)?

65 citations

Journal ArticleDOI
TL;DR: In this paper, the authors analyzed the influence of linear and two-photon absorption on phase conjugation efficiency and the validity limits of a model based on the classical Maxwell approach.

62 citations