Author
Haosheng Fei
Bio: Haosheng Fei is an academic researcher from Jilin University. The author has contributed to research in topics: Azobenzene & Birefringence. The author has an hindex of 8, co-authored 14 publications receiving 264 citations.
Topics: Azobenzene, Birefringence, Methyl orange, Optical storage, Excited state
Papers
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TL;DR: In this article, a liquid crystal with an azobenzene moiety as a photoactive mesogenic unit is investigated in photoinduced birefringence and the mechanism of long-term optical storage is discussed.
Abstract: A liquid crystal with an azobenzene moiety as a photoactive mesogenic unit is investigated in photoinduced birefringence. Measurements reveal that it possesses large magnitude of photoinduced birefringence (Δn∼10−2) and the characteristic of long-term optical storage. The resulting polarization information can be erased either by heating the sample to a temperature much higher than the glass transition temperature, or by optical method with a circularly polarized light. The mechanism of long-term optical storage is discussed in this letter.
102 citations
TL;DR: In this paper, photoinduced anisotropy and polarization holographic recording have been studied in an amorphous tripolymer containing azo-side groups and diverse mechanisms should be invoked to explain the experimental results.
66 citations
TL;DR: The recording utilizes an unusual photochemistry that is due to either to a triplet-triplet transition from a long-lived triplet lower state of the cis configuration or a transition back to the trans state.
Abstract: Biphoton holograms are recorded by a He–Ne laser in Methyl Orange and Ethyl Orange dyes on exposure to 514.5-nm argon-ion laser, and the dynamic of holographic recording is reported. The recording utilizes an unusual photochemistry that is due to either to a triplet–triplet transition from a long-lived triplet lower state of the cis configuration or a transition back to the trans state.
33 citations
TL;DR: In this paper, the dependence on surface environment of laser-induced luminescence and the nonlinear optical response of Fe 2 O 3 microcrystallites is studied, and the surface effect is analyzed in terms of surface effect.
23 citations
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
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TL;DR: In this article, the design and synthesis of several classes of suitable azobenzene functionalized polymers for the surface relief grating (SRG) formation process is discussed and experimental studies are carried out to understand the chemical and physical intricacies involved in the SRG formation process.
Abstract: All optical fabrication of Surface Relief Grating (SRG) on azobenzene functionalized polymer films is reviewed in this article. The uniqueness of the single step erasable photofabrication of large amplitude surface relief structures on azo polymer films is mainly due to the photoisomerization and photoanisotropic behavior of the azobenzene group. The design and synthesis of several classes of suitable azobenzene functionalized polymers for the SRG formation is presented. Experimental studies are carried out in a systematic manner to understand the chemical and physical intricacies involved in the SRG formation process. Structural requirements and their limitations for the efficient fabrication of SRGs on azo functionalized polymer films are also discussed. Understanding the fundamental mechanism of SRG formation on the azo functionalized polymer films enables us to make use of these structures in a variety of applications.
699 citations