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1 Nov 2010

Volume 97, Issue 18, Articles (18xxxx)

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Appl. Phys. Lett. 97, 183105 (2010); http://dx.doi.org/10.1063/1.3506485 (3 pages)

Z. H. Zhang, X. Q. Deng, X. Q. Tan, M. Qiu, and J. B. Pan
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Polymorphic transformation induced by nanoimprinted technology in pentacene-film early-stage growth

Ming-Hua Chang, Wei-Yang Chou, Yung-Chun Lee, Horng-Long Cheng, Hao-Yuan Chung, Chung-Chih Chang, Cheng-Yu Chiu, and Tsung-Yeh Ho

Appl. Phys. Lett. 97, 183301 (2010); http://dx.doi.org/10.1063/1.3512863 (3 pages)

Online Publication Date: 4 November 2010

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Polymorphism control of organic semiconductor films greatly affects optoelectronic device performance. The thin-film phase is always the dominant phase in the early growth of pentacene films; however, the performance of the bulk phase is superior to that of the thin-film phase. In the present study, a nanoimprinted polyimide layer is used to induce the growth of the bulk phase in the early stage. The bulk phase appears in the initial few layers and its dominance of the polymorphisms in the pentacene film increases with increasing thickness. The mechanism of the phase transformation is explained.
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68.55.ag Semiconductors
81.05.Fb Organic semiconductors
81.16.Nd Micro- and nanolithography
64.70.kg Semiconductors
81.30.Hd Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
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Wideband group velocity independent coupling into slow light silicon photonic crystal waveguide

Che-Yun Lin, Xiaolong Wang, Swapnajit Chakravarty, Beom Suk Lee, Wei-Cheng Lai, and Ray T. Chen

Appl. Phys. Lett. 97, 183302 (2010); http://dx.doi.org/10.1063/1.3513814 (3 pages) | Cited 5 times

Online Publication Date: 4 November 2010

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We experimentally demonstrate efficient optical coupling into a slow light photonic crystal waveguide (PCW) that is independent of the group velocity of the guided mode. With a group index taper to match the group velocity between a strip waveguide and a PCW, the optical coupling efficiency is nearly constant throughout the spectrum of the defect-mode, including the slow light region near the band edge. Compared to strip-PCW butt-coupling without a group index taper, our measurement results show a 20 dB enhancement in coupling efficiency with 5 dB less Fabry–Perot fluctuations. The measurements show excellent agreement with two-dimensional finite-difference time domain simulations.
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42.79.Gn Optical waveguides and couplers
42.82.Et Waveguides, couplers, and arrays
42.65.Re Ultrafast processes; optical pulse generation and pulse compression
42.70.Qs Photonic bandgap materials
42.65.Wi Nonlinear waveguides
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