In this paper, a polymer fiber was constructed by siphoning the xylene solution of a polymer into a capillary tube with 300 μm inner diameter. After the solvent evaporating, the polymer fiber was lighted by an external pump beam and the amplified spontaneous emission (ASE) of the polymer fiber is investigated. The emission spectra are recorded, and the intensity and the full width at half maximum (FWHM) as a function of pump power intensity are analyzed. The absorption coefficient of polymer F8BT is obtained from a polymer F8BT film with a thickness of 200 nm. For the high absorption of polymer, the pump beam can not penetrate the long F8BT fiber. The sketch up diagram and an optical photo show it in vividly. This fabrication method provides a cheap way for application of micro polymer fiber. Keywords: polymer fiber, amplified spontaneous emission, absorption coefficient
Gold–silver bimetallic nanoparticles with broad plasmon response were fabricated on soft substrates using a laser-induced transfer technique. The bimetallic nanostructures were fabricated with centimeter scale. By careful design, an approximately 200-nm broad plasmon response can be obtained by gold–silver alloy nanoparticles, which can be attributed to the electromagnetic interaction between gold and silver nanoparticles. This nanofabrication technique provides an annealing-free approach for the fabrication of flexible bimetallic nanostructures with a broad plasmon response with low cost.
The physical mechanism of the air impurity in volume holographic photonic crystals was investigated in this paper. The
photonic forbidden band with the air impurity was analyzed and calculated by the transfer matrix method. Verifications
were carried out using one dimensional holographic photonic crystals made with Dichromated Gelatin (DCG), and the
impurity modes were observed.
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