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Zhang X.,Nanjing Xiaozhuang University
Guangxue Xuebao/Acta Optica Sinica | Year: 2011

Based on the Snyder-Mitchell model that describes the paraxial beam propagating in strongly nonlocal nonlinear media and the trial solution with modulating the Gaussian beam by the parabolic cylinder functions, the close forms of elegant Hermite-Gaussian beams (EHGB) are accessed in Cartesian coordinate system. The collinear EHGB will evolve to be the rotating charge vortex EHGB on certain condition. It is shown that the transferring of the single EHGB and the rotating charge vortex EHGB at the critical power. The widths of the profiles of the breathers and the rotating charge vortex breathers are varied periodically in the transferring.

A novel coordination polymer, [Co 3(bta) 2(dib)2] ·4H 2O (1, H 3bta = benzene-1,3,5-triacetic acid, and dib = 1,4-di(1H-imidazol-1-yl)benzene), has been hydrothermally prepared and characterized by IR spectroscopy, elemental analysis and single-crystal X-ray diffraction. The crystal is of triclinic system, space group P1̄, with a = 9.141(2), b = 9.667(2), c = 13.855(2) Å, α = 100.83(3), β = 90.81(3), γ = 100.94(3)°, V = 1179.0(4) Å 3, C 48H 46N 8O 16Co 3, M r = 1167.72, D c = 1.645 g/cm 3, F(000) = 599, μ = 1.127 mm -1 and Z = 1. The final R = 0.0634 and wR = 0.1703 for 4291 observed reflections (I > 2σ(I)). In the title complex, the bta ligand acts as a four-dentate bridging ligand to link up cobalt atoms into a lamellar framework, which are further interlinked by the dib ligands to generate a binodal (3,8)-connected tfz-d net.

Yan S.-L.,Nanjing Xiaozhuang University
Wuli Xuebao/Acta Physica Sinica | Year: 2013

We present a "master-slave-response" synchronization system of chaotic multiple-quantum-well lasers. And we study the applications of chaotic parallel synchronization for optical logic gates. An injection multiple-quantum-well laser drives two responding systems of multiple-quantum-well lasers to obtain chaotic synchronization while the injection multiple-quantum-well laser can synchronize the responding systems. We present theoretically the constructions of the fundamental all-optical gates based on the parallel synchronization of responding systems and define their computational principle. By modulating the driving light into the responding systems, all-optical logic gates characterizing logic function are realized by synchronizing or unsynchronizing appropriately the two chaotic states of responding systems. We present all-optical XNOR, NOR, NOT logic gates and their logic computational methods. Numerical simulation result validates the feasibility of the system. © 2013 Chinese Physical Society.

Lang L.,Nanjing University | Lang L.,Nanjing Xiaozhuang University | Xu Z.,Nanjing University
ACS Applied Materials and Interfaces | Year: 2013

The porous Fe3O4/C microbelts (FCBs) were synthesized by simple electrospinning method, combined with carbonization of the precursor microbelts at high temperature in N2 flow. Compared with α-Fe2O3 microbelt, the FCBs show better cyclic performance. The high capacity of 710 mA h g-1 is still maintained after 50 cycles. The excellent performance of FCBs in lithium-ion batteries can be attributed to the highly stable porous belt structure of FCBs and to the substantial structure carbon matrix surrounded Fe3O4 nanoparticles. The synthesis method is simple, cheap, and green and could be extended to fabricate other carbon composites. © 2013 American Chemical Society.

A method to enhance the relaxation oscillation frequency and carrier bandwidth of a delayed feedback semiconductor laser transmitter is presented using additive optical feedback light. A formula for frequency detuning of the optical dual-feedback is developed to demonstrate that frequency detuning is added with the additive optical feedback light level. The function of the relaxation oscillation frequency of the chaotic laser is theoretically determined to show that it can be broadened by including the delay time and feedback level. Numerical results demonstrate that the bandwidth with the additive optical feedback light can be enhanced 1.7 times more than the bandwidth without it and the relaxation oscillation frequency of the chaotic laser is increased to 1.8 times more than that of the laser without it. The current can enhance the relaxation oscillation frequency and bandwidth of the transmitter more efficiently. © 2010 Elsevier B.V. All rights reserved.

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