SnS∶Ag thin films were deposited on ITO glasses by pulse electro-deposition. By studying the effect of duty cycle on the properties of SnS∶Ag thin films, the optimum off-time(toff) is obtained to be 5 s, namely, the...SnS∶Ag thin films were deposited on ITO glasses by pulse electro-deposition. By studying the effect of duty cycle on the properties of SnS∶Ag thin films, the optimum off-time(toff) is obtained to be 5 s, namely, the optimal duty cycle is about 67%. The primary phase of SnS∶Ag films deposited on optimum parameters condition is SnS compound with good crystallization, and the films prefer to grow towards (111) plane. The films are dense, smooth and uniform with good microstructure, and the grains in the films are densely packed together, and their direct bandgap is about 1.40 eV. In addition, the bandgap of the films first rises and then drops with the increase of the duty cycle.展开更多
Vanadium oxide thin films were prepared on glass substrates by using the spray pyrolysis technique. The effect of solution concentration （0.1 M, 0.2 M and 0.3 M ） on the nanostructural, electrical, optical, and elec...Vanadium oxide thin films were prepared on glass substrates by using the spray pyrolysis technique. The effect of solution concentration （0.1 M, 0.2 M and 0.3 M ） on the nanostructural, electrical, optical, and electrochromic properties of deposited films were investigated using X-ray diffraction, scanning electron microscopy, UV-vis spectroscopy, and cyclic volta-metrics. The X-ray diffraction shows that only the sample at 0.1 M has a single fl-V205 phase and the others have mixed phases of vanadium oxide. The lowest sheet resistance was obtained for the samples prepared at 0.3 M solution. It was also found that the optical transparency of the samples changes from 70% to 35% and the optical band gap of the samples was in the range of 2.20 to 2.41 eV, depending on the morality of solution. The cycle voltammogram shows that the sample prepared at 0.3 M has one-step electerochoromic but the other samples have two-step electerochoromic. The results show a correlation between the cycle voltammogram and the physical properties of the films.展开更多
Recent developments in ultrafast laser technology have resulted in novel few-cycle sources in the mid-infrared.Accurately characterizing the time-dependent intensities and electric field waveforms of such laser pulses...Recent developments in ultrafast laser technology have resulted in novel few-cycle sources in the mid-infrared.Accurately characterizing the time-dependent intensities and electric field waveforms of such laser pulses is essential to their applications in strong-field physics and attosecond pulse generation,but this remains a challenge.Recently,it was shown that tunnel ionization can provide an ultrafast temporal“gate”for characterizing highenergy few-cycle laser waveforms capable of ionizing air.Here,we show that tunneling and multiphoton excitation in a dielectric solid can provide a means to measure lower-energy and longer-wavelength pulses,and we apply the technique to characterize microjoule-level near-and mid-infrared pulses.The method lends itself to both all-optical and on-chip detection of laser waveforms,as well as single-shot detection geometries.展开更多
A novel prefigured-cycle(P-Cycle)algorithm was proposed to improve the protection success ratio for asymmetric traffic in mesh optical networks.The proposed algorithm was simulated in a Pan-European COST239 network en...A novel prefigured-cycle(P-Cycle)algorithm was proposed to improve the protection success ratio for asymmetric traffic in mesh optical networks.The proposed algorithm was simulated in a Pan-European COST239 network environment under an asymmetric dynamic traffic model.The experimental results show that the proposed algorithm has lower capacity redundancy and higher utilization rate of configured resources than traditional P-Cycle methods.Network performance can be improved when implementing this algorithm under single-link failure circumstances.The system behavior is analyzed under different traffic volumes and the configuration strategy is also investigated for the heavyload and light-load networks respectively.展开更多
基金National Nature Sciences Funding of China(61076063)Key Project of Fujian Provincial Department of Science &Technology(2008I0019)Fujian Provincial Natural Science Foundation of China(2009J01285)
文摘SnS∶Ag thin films were deposited on ITO glasses by pulse electro-deposition. By studying the effect of duty cycle on the properties of SnS∶Ag thin films, the optimum off-time(toff) is obtained to be 5 s, namely, the optimal duty cycle is about 67%. The primary phase of SnS∶Ag films deposited on optimum parameters condition is SnS compound with good crystallization, and the films prefer to grow towards (111) plane. The films are dense, smooth and uniform with good microstructure, and the grains in the films are densely packed together, and their direct bandgap is about 1.40 eV. In addition, the bandgap of the films first rises and then drops with the increase of the duty cycle.
文摘Vanadium oxide thin films were prepared on glass substrates by using the spray pyrolysis technique. The effect of solution concentration （0.1 M, 0.2 M and 0.3 M ） on the nanostructural, electrical, optical, and electrochromic properties of deposited films were investigated using X-ray diffraction, scanning electron microscopy, UV-vis spectroscopy, and cyclic volta-metrics. The X-ray diffraction shows that only the sample at 0.1 M has a single fl-V205 phase and the others have mixed phases of vanadium oxide. The lowest sheet resistance was obtained for the samples prepared at 0.3 M solution. It was also found that the optical transparency of the samples changes from 70% to 35% and the optical band gap of the samples was in the range of 2.20 to 2.41 eV, depending on the morality of solution. The cycle voltammogram shows that the sample prepared at 0.3 M has one-step electerochoromic but the other samples have two-step electerochoromic. The results show a correlation between the cycle voltammogram and the physical properties of the films.
基金U.S.Department of Energy(DE-SC0019291)National Science Foundation(1809181)Air Force Office of Scientific Research(FA9550-16-1-0149,FA9550-20-1-0284).
文摘Recent developments in ultrafast laser technology have resulted in novel few-cycle sources in the mid-infrared.Accurately characterizing the time-dependent intensities and electric field waveforms of such laser pulses is essential to their applications in strong-field physics and attosecond pulse generation,but this remains a challenge.Recently,it was shown that tunnel ionization can provide an ultrafast temporal“gate”for characterizing highenergy few-cycle laser waveforms capable of ionizing air.Here,we show that tunneling and multiphoton excitation in a dielectric solid can provide a means to measure lower-energy and longer-wavelength pulses,and we apply the technique to characterize microjoule-level near-and mid-infrared pulses.The method lends itself to both all-optical and on-chip detection of laser waveforms,as well as single-shot detection geometries.
基金supported by the Hi-Tech Research and Development Program of China (No.2006AA01Z246)the National Natural Science Foundation of China (Grant No.60602004).
文摘A novel prefigured-cycle(P-Cycle)algorithm was proposed to improve the protection success ratio for asymmetric traffic in mesh optical networks.The proposed algorithm was simulated in a Pan-European COST239 network environment under an asymmetric dynamic traffic model.The experimental results show that the proposed algorithm has lower capacity redundancy and higher utilization rate of configured resources than traditional P-Cycle methods.Network performance can be improved when implementing this algorithm under single-link failure circumstances.The system behavior is analyzed under different traffic volumes and the configuration strategy is also investigated for the heavyload and light-load networks respectively.
