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Fully transparent flexible transistors built
on metal oxide nanowires
Di CHEN, Guozhen SHEN, Jing XU,
Front. Optoelectron.. 2010, 3 (3): 217-227.
https://doi.org/10.1007/s12200-010-0110-0
Transparent electronics has attracted great research efforts in recent years due to its potential to make significant impact in many area, such as next generation displays, ultraviolet (UV) detectors, solar cells, charge-coupled devices (CCDs), and so on. Central to the realization of transparent electronics is the development of high performance fully transparent thin-film transistors (TFTs). One-dimensional (1-D) nanostructures have been the focus of current researches due to their unique physical properties and potential applications in nanoscale elec-tronics and optoelectronics. Among 1-D nanostructures, transparent metal oxide nanowires are one of the best candidates to make fully transparent TFTs. We provide in this paper the most recent development on the fabrication of fully transparent TFT using metal oxide nanowires as the device elements. First, the review article gives a general introduction about the development of transparent elec-tronics using different kinds of materials as the devices elements, including organic semiconductors, metal oxide thin films, and metal oxide nanowires. Second, the growth of metal oxide nanowires using vapor phase methods governed by two different growth mechanisms: vapor-solid mechanism and vapor-liquid-solid mechanism, respectively, are described. Third, the fabrication of transparent and flexible TFTs using different metal oxides nanowires is comprehensively described. In conclusion, the challenges and prospects for the future are discussed.
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High-speed, all-optical XOR gates using semiconductor
optical amplifiers in ultrafast nonlinear interferometers
Xuelin YANG, Qiwei WENG, Weisheng HU,
Front. Optoelectron.. 2010, 3 (3): 245-252.
https://doi.org/10.1007/s12200-010-0105-x
We will review three recently-proposed high-speed, all-optical Exclusive OR (XOR) gates operating at 40 and 85 Gb/s, which were demonstrated using ultrafast nonlinear interferometers (UNIs) incorporating semiconductor optical amplifiers (SOAs). The first 40-Gb/s XOR gate was obtained using a dual UNI configuration. The second is a 40-Gb/s XOR gate without additional probe beam required, where the only inputs launched into the setup were data A and B. The XOR logic of data A and B is the sum of two components and , each of which was obtained from the output of UNI via cross-phase modulation (XPM) in SOAs. Furthermore, an 85-Gb/s XOR gate is, by far, the fastest XOR gate realized by SOAs, which was also demonstrated using a dual UNI structure. The operating speed of the XOR gate was enhanced by incorporating the recently proposed turbo-switch configuration. In addition, the SOA switching pulse energies of these XOR gates were lower than 100fJ.
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Use of adaptive RLS, LMS, and NLMS algorithms
for nonlinearity modeling in a modified laser interferometer
Saeed OLYAEE, Mohammad Shams Esfand ABADI, Samaneh HAMEDI, Fatemeh FINIZADEH,
Front. Optoelectron.. 2010, 3 (3): 264-269.
https://doi.org/10.1007/s12200-010-0095-8
Laser heterodyne interferometer is one kind of nano-metrology systems which has been widely used in industry for high-accuracy displacement measurements. The accuracy of the nano-metrology systems based on the laser heterodyne interferometers can be effectively limited by the periodic nonlinearity. In this paper, we present the nonlinearity modeling of the nano-metrology interferometric system using some adaptive filters. The adaptive algorithms consist of the least mean squares (LMS), normalized least mean squares (NLMS), and recursive least squares (RLS). It is shown that the RLS algorithm can obtain optimal modeling parameters of nonlinearity.
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Theoretical demonstration for signal gain in
multiple four-wave mixing processes based on cubic susceptibility
medium
Liang ZHAO, Junqiang SUN, Zhefeng HU, Qian HU, Yujie ZHOU, Jing SHAO, Tianye HUANG, Jun LI,
Front. Optoelectron.. 2010, 3 (3): 270-282.
https://doi.org/10.1007/s12200-010-0106-9
An insight into the signal gain in multiple four-wave mixing (MFWM) processes based on a cubic susceptibility medium is theoretically proposed and demonstrated. A dual-pumped fiber optical parametric amplification (FOPA) model is developed with the exact expressions for the signal gain and its 3-dB bandwidth successfully yielded. With these analytical expressions, we show that when pump-1 and pump-2 wavelengths tuned at 1549 and 1551.02 nm, the 3-dB bandwidth of the signal gain can be achieved at about 2253.4 nm theoretically by properly setting the pumped powers. Numerical simulations show that there is a small pinnacle emerging in the signal gain spectrum owing to the degenerate OPA process occurring. The proposed OPA model can find potential applications in all-optical wavelength conversion, optical amplifier, and all-optical sampling.
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Diffraction of Lorentz-Gauss beam in uniaxial
crystals: orthogonal to optical axis
Jia LI, Yanru CHEN, Shixue XU, Yongqing WANG, Muchun ZHOU, Qi ZHAO, Yu XIN, Feinan CHEN,
Front. Optoelectron.. 2010, 3 (3): 292-302.
https://doi.org/10.1007/s12200-010-0111-z
Based on the diffraction theory of beams in uniaxial crystals, diffraction properties of a Lorentz-Gauss beam in uniaxial crystals orthogonal to the optical axis are derived in analytical forms. Diffraction fields, intensity distributions and effects of beam parameters are investigated by numerical examples, respectively. Results show that, upon propagation, initial field components and intensity distributions of Lorentz-Gauss beams would deteriorate due to effects of anisotropic media. When the Lorentz-Gauss beam diffracts into the far field, its intensity distribution would convert into a four-petal profile. Beam parameters wx and wy are shown to have a strong influence on intensity distributions. By selecting different values of them, profiles of Lorentz-Gauss beams would be different upon propagation.
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Laser stripping of fiber Bragg grating polymer
coating using pulsed 10.6?μm TEA CO 2 laser
Haihong ZHU, Wenjuan LEI, Cheng DAI, Zuhai CHENG,
Front. Optoelectron.. 2010, 3 (3): 303-307.
https://doi.org/10.1007/s12200-010-0097-6
Stripping the polymer coating is the first step for the fabrication of fiber Bragg grating (FBG). The conventional stripping approaches are labor intensive and time consuming. Because of high precision and throughput, as well as non-contacting, laser stripping obtained more and more attention in recent years. This paper reports the primary experiments on laser stripping of polymer coating from FBG using pulsed transverse electric atmospheric (TEA) CO2 laser with wavelength of 10.6 μm and pulse width of 2 μs. Using cylindrical lenses, the coating can be removed thoroughly at one time. The theoretical analysis and experimental investigations were carried out. The influence of laser fluence and pulse number on stripping quality has been investigated. Scanning electron microscopy (SEM), optical microscope, and electrical balance were employed to detect the quality removal. The result shows that excellent quality removal is possible by using pulsed 10.6 μm TEA CO2 laser.
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Optimization for data de-duplication algorithm
based on file content
Xuejun NIE, Leihua QIN, Jingli ZHOU, Ke LIU, Jianfeng ZHU, Yu WANG,
Front. Optoelectron.. 2010, 3 (3): 308-316.
https://doi.org/10.1007/s12200-010-0103-z
Content defined chunking (CDC) is a prevalent data de-duplication algorithm for removing redundant data segments in archival storage systems. Current researches on CDC do not consider the unique content characteristic of different file types, and they determine chunk boundaries in a random way and apply a single strategy for all file types. It has been proven that such method cannot achieve optimal performance for compound archival data. We analyze the content characteristic of different file types and propose candidate anchor histogram (CAH) to capture it. We propose an improved strategy for determining chunk boundaries based on CAH and tune some key parameters of CDC based on the data layout of underlying data de-duplication file system (TriDFS), which can efficiently store variable-sized chunks on fixed-sized physical blocks. These strategies are evaluated with representative archival data, and the result indicates that they can increase on average the compression ratio by 16.3% and write throughput by 13.7%, while only decrease the read throughput by 2.5%.
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Aged rare earth doped silicates as optoelectronic
material
Vandana RANGA, H. N. ACHARYA, R. K. KHANNA, Anirudh KUMAR,
Front. Optoelectron.. 2010, 3 (3): 328-331.
https://doi.org/10.1007/s12200-010-0096-7
Samples of various concentrations were prepared and kept unsintered for a period of three years to study the consistency of composition prepared and structural evolution of glass. The expanded peaks in the Raman spectra arise due to thermal agitation, and a Boltzmann type of distribution was expected in the silicate gels. The behavior of the gels during the dehydroxylation and dehydration is conditioned by its microstructure, which depends upon the physical conditions, i.e., pH, and drying conditions.
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17 articles
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