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19 Dec 2011

Volume 99, Issue 25, Articles (25xxxx)

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Appl. Phys. Lett. 99, 253701 (2011); http://dx.doi.org/10.1063/1.3666819 (3 pages)

Jun Huang, Hui Li, Wei Chen, Guo-Hua Lv, Xing-Quan Wang, Guo-Ping Zhang, Kostya Ostrikov, Peng-Ye Wang, and Si-Ze Yang
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Photoinduced write-once read-many-times memory device based on DNA biopolymer nanocomposite

Yu-Chueh Hung, Wei-Ting Hsu, Ting-Yu Lin, and Ljiljana Fruk

Appl. Phys. Lett. 99, 253301 (2011); http://dx.doi.org/10.1063/1.3671153 (3 pages) | Cited 6 times

Online Publication Date: 19 December 2011

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We demonstrate a photoinduced write-once read-many-times (WORM) organic memory device based on DNA biopolymer nanocomposite. The device consists of a single biopolymer layer sandwiched between electrodes, in which electrical bistability is activated by in situ formation of silver nanoparticles embedded in biopolymer upon light irradiation. The device exhibits a switching effect to high conductivity above a threshold of 2.6 V and a good retention property. This facile technique, taking advantage of DNA’s affinity for metals and solution processing, can optically manipulate the properties of DNA nanocomposite thin films, which holds promise for optical storage and plasmonic applications.
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42.79.Vb Optical storage systems, optical disks
85.35.-p Nanoelectronic devices
42.70.Jk Polymers and organics
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Direct electron beam writing of Bragg gratings in exciton polariton waveguides of organic dye nanofibers

Ken Takazawa, Kazutaka Mitsuishi, and Jun-ichi Inoue

Appl. Phys. Lett. 99, 253302 (2011); http://dx.doi.org/10.1063/1.3671148 (4 pages) | Cited 4 times

Online Publication Date: 20 December 2011

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We develop a direct electron beam (EB) writing technique to fabricate Bragg gratings in organic dye nanofibers of thiacyanine that propagate exciton polaritons (EPs) along the fibers. The scanning electron beam with elaborately optimized parameters “bleaches” the nanofibers with a 100-nm-scale spatial resolution, leading to variation in the refractive index on that scale. We demonstrate that the fabricated Bragg gratings, with a period number N = 40 and a period length Λ ranging from 150 to 200 nm, reflect propagating exciton polaritons with a reflectance of up to ∼0.7.
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42.81.Bm Fabrication, cladding, and splicing
42.79.Dj Gratings
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