| Record 1 of 10 |
| Author(s): Li, XK (Li XinKun); Li, QS (Li QingShan); Liang, DC (Liang DeChun); Xu, YD (Xu YanDong); Xie, XJ (Xie XiaoJun) |
| Title: Effect of silver growth temperature on the contacts between Ag and ZnO thin films |
| Source: SCIENCE IN CHINA SERIES E-TECHNOLOGICAL SCIENCES, 52 (9): 2779-2784 Sp. Iss. SI SEP 2009 |
| Abstract: Highly c-axis oriented ZnO thin films were deposited on Si substrates by the pulsed laser deposition (PLD) method. At different growth temperatures, 200 nm silver films as the contact metal were deposited on the ZnO thin films. The growth temperatures have great influence on the crystal quality of Ag films. Current-voltage characteristics were measured at room temperature. The Schottky contacts between Ag and ZnO thin films were successfully obtained when silver electrodes were deposited at 150A degrees C and 200A degrees C. Ohmic contacts were formed while the growth temperatures were lower than 150A degrees C or higher than 200A degrees C. After analysis, the forming of Ag/ZnO Schottky contacts was shown to be dependent on the appearance of the p-type inversion layer at the interface between Ag and ZnO layers. |
| ISSN: 1006-9321 |
| DOI: 10.1007/s11431-009-0155-8 |
| Record 2 of 10 |
| Author(s): Geng, MM (Geng, Minming); Jia, LX (Jia, Lianxi); Zhang, L (Zhang, Lei); Yang, L (Yang, Lin); Chen, P (Chen, Ping); Liu, YL (Liu, Yuliang) |
| Title: Compact four-channel reconfigurable optical add-drop multiplexer using silicon photonic wire |
| Source: OPTICS COMMUNICATIONS, 282 (17): 3477-3480 SEP 1 2009 |
| Abstract: We designed and fabricated a four-channel reconfigurable optical add-drop multiplexer based on silicon photonic wire waveguide, which is controlled through the thermo-optic effect. The effective footprint of the device is about 1000 x 500 mu m(2). The minimum insertion loss including the transmission loss and coupling loss is about 10.7 dB. The tuning bandwidth is about 17 nm, the average tuning efficiency about 6.11 mW/nm and the tuning speed about 24.5 kHz. (c) 2009 Elsevier B.V. All rights reserved. |
| ISSN: 0030-4018 |
| DOI: 10.1016/j.optcom.2009.06.009 |
| Record 3 of 10 |
| Author(s): Han, W (Han, Wei); Zhu, NH (Zhu, Ning-Hua); Xie, L (Xie, Liang); Ren, M (Ren, Min); Sun, K (Sun, Ke); Zhang, BH (Zhang, Bang-Hong); Li, L (Li, Liang); Zhang, HG (Zhang, Hong-Guang) |
| Title: Injection locked Fabry-Perot laser diodes for WDM passive optical network spare function |
| Source: OPTICS COMMUNICATIONS, 282 (17): 3553-3557 SEP 1 2009 |
| Abstract: In this paper, a protection scheme for transmitters in wavelength-division-multiplexing passive optical network (WDM-PON) has been proposed and demonstrated. If any downstream transmitter encounters problems at the central office (CO), the interrupted communication can be restored immediately by injecting a Fabry-Perot laser diode (FP-LD) with the upstream lightwave corresponding to the failure transmitter. Compared with the conventional methods, this proposed architecture provides a cost-effective and reliable protection scheme employing a common FP-LD. In the experiment, a 1:36 protection capability was implemented with a 2.5 Gbit/s downstream transmission capability. (C) 2009 Elsevier B.V. All rights reserved. |
| ISSN: 0030-4018 |
| DOI: 10.1016/j.optcom.2009.05.057 |
| Record 4 of 10 |
| Author(s): Wang, M (Wang, Miao); Chang, K (Chang, Kai); Wang, LG (Wang, L. G.); Dai, N (Dai, Ning); Peeters, FM (Peeters, F. M.) |
| Title: Crystallographic plane tuning of charge and spin transport in semiconductor quantum wires |
| Source: NANOTECHNOLOGY, 20 (36): Art. No. 365202 SEP 9 2009 |
| Abstract: We investigate theoretically the charge and spin transport in quantum wires grown along different crystallographic planes in the presence of the Rashba spin-orbit interaction (RSOI) and the Dresselhaus spin-orbit interaction (DSOI). We find that changing the crystallographic planes leads to a variation of the anisotropy of the conductance due to a different interplay between the RSOI and DSOI, since the DSOI is induced by bulk inversion asymmetry, which is determined by crystallographic plane. This interplay depends sensitively on the crystallographic planes, and consequently leads to the anisotropic charge and spin transport in quantum wires embedded in different crystallographic planes. |
| ISSN: 0957-4484 |
| Article Number: 365202 |
| DOI: 10.1088/0957-4484/20/36/365202 |
| Record 5 of 10 |
| Author(s): Chen, W (Chen, Wei); Zhu, NH (Zhu, Ning Hua); Ren, M (Ren, Min); Xie, L (Xie, Liang) |
| Title: FREQUENCY RESPONSE OF FIBER RING RESONATOR AND ITS APPLICATION IN DFB LASER WAVELENGTH VARIATION MEASUREMENT |
| Source: MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, 51 (10): 2444-2448 OCT 2009 |
| Abstract: Frequency response of a fiber ring resonator (FRR) composed of an ordinary optical coupler and a segment of optical fiber is theoretically and experimentally investigated. The frequency response equation based oil small-signal modulation is derived and studied in detail. It is shown that the shape of the frequency response curve is very sensitive to the wavelength; as a result, the FRR can be applied to measure the wavelength of a lightwave source with high resolution. With this method, we demonstrate the measurement of tiny changes of wavelength of a DFB laser. (C) 2009 Wiley Periodicals. Inc. Microwave Opt Technol Lett 51: 2444-2448, 2009 Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24608 |
| ISSN: 0895-2477 |
| DOI: 10.1002/mop.24608 |
| Record 6 of 10 |
| Author(s): Zhao, HS (Zhao, Hongsheng); Chang, AM (Chang, Aimin); Wang, YL (Wang, Yunlan) |
| Title: Structural, elastic, and electronic properties of cubic perovskite BaHfO3 obtained from first principles |
| Source: PHYSICA B-CONDENSED MATTER, 404 (16): 2192-2196 AUG 1 2009 |
| Abstract: We investigated the structural, elastic, and electronic properties of the cubic perovskite-type BaHfO3 using a first-principles method based on the plane-wave basis set. Analysis of the band structure shows that perovskite-type BaHfO3 is a wide gap indirect semiconductor. The band-gap is predicted to be 3.94 eV within the screened exchange local density approximation (sX-LDA). The calculated equilibrium lattice constant of this compound is in good agreement with the available experimental and theoretical data reported in the literatures. The independent elastic constants (C-11, C-12, and C-44), bulk modules B and its pressure derivatives B', compressibility beta, shear modulus G, Young's modulus Y, Poisson's ratio nu, and Lame constants (mu, lambda) are obtained and analyzed in comparison with the available theoretical and experimental data for both the singlecrystalline and polycrystalline BaHfO3. The bonding-charge density calculation make it clear that the covalent bonds exist between the Hf and 0 atoms and the ionic bonds exist between the Ba atoms and HfO3 ionic groups in BaHfO3. (C) 2009 Elsevier B.V. All rights reserved. |
| ISSN: 0921-4526 |
| DOI: 10.1016/j.physb.2009.04.011 |
| Record 7 of 10 |
| Author(s): Liu, Y (Liu, Yan); Li, Y (Li, Yan); Fan, ZC (Fan, Zhongchao); Xing, B (Xing, Bo); Yu, YD (Yu, Yude); Yu, JZ (Yu, Jinzhong) |
| Title: Fabrication and optical optimization of spot-size converters with strong cladding layers |
| Source: JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS, 11 (8): Art. No. 085002 AUG 2009 |
| Abstract: A silicon-on-insulator (SOI) optical fiber-to-waveguide spot-size converter (SSC) overlaid with specially treated silica is investigated for integrated optical circuits. Unlike the conventional process of simply depositing the hot silica on silicon waveguides, two successive layers of silicon dioxide were grown on etched SSC structures by PECVD (plasma-enhanced chemical vapor deposition). The two layers have 0.8% index contrast and supply stronger cladding for an incident light beam. Additionally, this process is able to reduce the effective refractive index of the input mode to less than 1.47 (extremely close to that of the fiber), substantially weakening the unwanted back reflection. Exploiting this technology, it was demonstrated that the SSC showed a theoretical low mode mismatch loss of 1.23 dB for a TE-like mode and has an experimental coupling efficiency of 66%. |
| ISSN: 1464-4258 |
| Article Number: 085002 |
| DOI: 10.1088/1464-4258/11/8/085002 |
| Record 8 of 10 |
| Author(s): Jia, L (Jia, Liang); Zhang, F (Zhang, Fan); Li, M (Li, Ming); Liu, YL (Liu, Yuliang); Chen, ZY (Chen, Zhangyuan) |
| Title: Numerical analysis for four-wave mixing based wavelength conversion of differential phase-shift keying signals |
| Source: CHINESE OPTICS LETTERS, 7 (7): 617-620 JUL 10 2009 |
| Abstract: We numerically investigate the main constrains for high efficiency wavelength conversion of differential phase-shift keying (DPSK) signals based on four-wave mixing (FWM) in highly nonlinear fiber (HNLF). Using multi-tone pump phase modulation techniques, high efficiency wavelength conversion of DPSK signals is achieved with the stimulated Brillouin scattering (SBS) effects effectively suppressed. Our analysis shows that there is a compromise between conversion efficiency and converted idler degradation. By optimizing the pump phase modulation configuration, the converted DPSK idler's degradation can be dramatically decreased through balancing SBS suppression and pump phase modulation degradation. Our simulation results also show that these multi-tone pump phase modulation techniques are more appropriate for the future high bit rate systems. |
| ISSN: 1671-7694 |
| DOI: 10.3788/COL20090707.0617 |
| Record 9 of 10 |
| Author(s): Zhu, YG (Zhu, Yonggang); Zhang, XH (Zhang, Xinhui); Li, T (Li, Tao); Huang, X (Huang, Xia); Han, LF (Han, Lifen); Zhao, JH (Zhao, Jianhua) |
| Title: Ultrafast dynamics of four-state magnetization reversal in (Ga,Mn)As |
| Source: APPLIED PHYSICS LETTERS, 95 (5): Art. No. 052108 AUG 3 2009 |
| Abstract: The ultrafast dynamics of in-plane four-state magnetization reversal from compressively strained (Ga,Mn)As film was investigated by magneto-optical Kerr rotation measurement. The magnetization reversal signal was dramatically suppressed upon pumping, and recovered slowly with time evolution. The low switching field H-c1 increased abruptly from 30 to 108 G on the first several picoseconds and recovered back to the value before optical pumping within about 500 ps, whereas the high switching field H-c2 did not change obviously upon pumping, implying a domain-wall nucleation/propagation at low fields and coherent magnetization rotation at high fields in the magnetization reversal process. |
| ISSN: 0003-6951 |
| Article Number: 052108 |
| DOI: 10.1063/1.3202395 |
| Record 10 of 10 |
| Author(s): Wang, CX (Wang, Chunxia); Roither, J (Roither, Juergen); Kirschschlager, R (Kirschschlager, Raimund); Kovalenko, MV (Kovalenko, Maksym V.); Brehm, M (Brehm, Moritz); Fromherz, T (Fromherz, Thomas); Kan, Q (Kan, Qiang); Tan, PH (Tan, Pingheng); Liu, J (Liu, Jian); Chen, HD (Chen, Hongda); Heiss, W (Heiss, Wolfgang) |
| Title: Enhanced infrared emission from colloidal HgTe nanocrystal quantum dots on silicon-on-insulator photonic crystals |
| Source: APPLIED PHYSICS LETTERS, 95 (5): Art. No. 053107 AUG 3 2009 |
| Abstract: A two dimensional silicon-on-insulator based photonic crystal structure is used to enhance the emission from colloidal HgTe nanocrystal quantum dots embedded in a thin polymer film. The enhancement is resonant to the leaky eigenmodes of the photonic crystals due to coherent scattering effects. Transmittance and photoluminescence experiments are presented to map the leaky mode dispersion and the angle dependence of the emission enhancement factor, which reaches values up to 80 (650) for vertical (oblique) emission in the telecommunication wavelength range. |
| ISSN: 0003-6951 |
| Article Number: 053107 |
| DOI: 10.1063/1.3194151 |
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