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	1. Apodized Grating Coupler Using Fully-etched Nanostructures
	WU Hua,LI Chong,LI Zhiyong,GUO Xia
	Physics 02 December 2015
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	Abstract:A 2-dimensional apodized grating coupler for interfacing between single-mode ?bers and photonic circuits on silicon-on-insulator is demonstrated. The grating coupler with grating grooves are realized by columns of fully etched nanostructures, with the feasibility of digitally tailoring the effective refractive index of each groove in order to obtain the Gaussian-like output diffractive mode in order to enhance the coupling efficiency to the optical fiber. Compared with the uniform grating couplers, the coupling efficiency of the apodized grating couplers increased by 4.3% and 5.7%, respectively, for the nanoholes and nanorectangles as refractive index tuning layer.
	TO cite this article:WU Hua,LI Chong,LI Zhiyong, et al. Apodized Grating Coupler Using Fully-etched Nanostructures[J].


	2. Molecular Design and Performance of Novel Metalloporphyrin Dyes for Efficient Dye-Sensitized Solar Cells
	SUN Qilong,DAI Ying,HUANG Baibiao
	Physics 19 October 2015
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	Abstract:In search of higher photoelectric conversion efficiency, we design a series of novel donor-π-acceptor sensitizers for dye-sensitized solar cells (DSSCs). The proposed zinc porphyrin sensitizers have been theoretically validated to show superior efficiency to YD2-o-C8. The geometries, electronic structure and optical properties of five new proposed metalloporphyrin dye molecules are firstly checked on the basis of density functional theory (DFT) in conjunction with time-dependent density functional theory (TD-DFT) calculations. The geometric structures of the considered dye molecules show varying degrees of deformation. Furthermore, some novel magnetic characteristics are involved in the cases of Fe-dye and Cu-dye. The detailed analysis of the UV/Vis absorption spectra indicates that, compared with the Zn-dye, Cd-dye, Mg-dye and Ni-dye would present improved light absorption properties . In addition, we further demonstrate that the transition metal atoms (Fe and Cu) play an important role in promoting the electron injection as well as the reduction of dye molecules in system of dye/(TiO2)38, which is a model system as a photoanode. These findings contribute to the comprehensive understanding about such type of metalloporphyrin dye molecules and shed insight on the synthesis and application of sensitizers in the near future.
	TO cite this article:SUN Qilong,DAI Ying,HUANG Baibiao. Molecular Design and Performance of Novel Metalloporphyrin Dyes for Efficient Dye-Sensitized Solar Cells[OL].[19 October 2015] http://en.paper.edu.cn/en_releasepaper/content/4656089

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	3. Spin-wave propagating spectrum in magnetization-modulated cylindrical nanowire
	LI Zhixiong,Wang Mengning,NIE Yaozhuang,Wang Daowei,Tang Wei,GUO Guanghua
	Physics 30 September 2015
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	Abstract:We investigate the spin-wave propagation in magnetization-modulated cylindrical nanowire by using micromagnetic simulations. Several spin-wave bandgaps are observed on spin-wave propagating spectra and dispersion curves, which are caused by the Bragg reflection of the propagating spin waves at the Brillouin zone boundaries. The bandgaps can be effectively tuned by changing the magnetization modulation level and the periodic length. The manipulation mechanism of the band structure is explained through combined consideration of the periodic effective field and the spin-wave scattering characteristics at the interface of two magnetization segments.
	TO cite this article:LI Zhixiong,Wang Mengning,NIE Yaozhuang, et al. Spin-wave propagating spectrum in magnetization-modulated cylindrical nanowire[OL].[30 September 2015] http://en.paper.edu.cn/en_releasepaper/content/4656499


	4. State-to-state quantum dynamics of the N(4S)+H2(X1∑+)→NH(X3∑-)+H reaction and its reaction mechanism analysis
	Zhang Jing,Gao Shoubao,Wu Hui,Meng Qingtian
	Physics 13 April 2015
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	Abstract:Quantum state-to-state dynamics of the reaction is reported on an accurate novel potential energy surface constructed by Zhai et al.(J. Chem. Phys. 135, 104314(2011)). The time-dependent wave packet method, which is implemented on graphics processing units, has been used to calculate the differential cross sections. The influences of the collision energy on the product state-resolved integral cross sections and total differential cross sections are calculated and discussed. It is found that the products NH are predominated by the backward scattering due to the small impact parameter collisions, with only minor components being forward and sideways scattering, and have an inverted rotational distribution and no inversion in vibrational distributions; both rebound and stripping mechanism exist in the case of high collision energies.
	TO cite this article:Zhang Jing,Gao Shoubao,Wu Hui, et al. State-to-state quantum dynamics of the N(4S)+H2(X1∑+)→NH(X3∑-)+H reaction and its reaction mechanism analysis[OL].[13 April 2015] http://en.paper.edu.cn/en_releasepaper/content/4638939


	5. Enhancement of optical nonlinearity by core-shell bimetallicnanostructures
	MA Pujuan,GAO Dongliang,GAO Lei
	Physics 29 January 2015
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	Abstract:We propose an alternative way to enhance optical nonlinearity from nanocomposites containing nonlinear bimetallic nanostructures. The optical nonlinearity enhancement result from two aspects: firstly, both core and shell are metallic material with large nonlinearity themselves; secondly, there are two resonant frequencies for core-shell nanostructures, which are helpful to strengthen the local fields in the core and shell. By fine adjustment of the core-shell size ratio, it is possible to achieve the maximal enhancement of optical nonlinearity from bimetallic coated nanocomposites.
	TO cite this article:MA Pujuan,GAO Dongliang,GAO Lei. Enhancement of optical nonlinearity by core-shell bimetallicnanostructures[OL].[29 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4631189


	6. Self-trapping and self-deflection of a light beam in LiNbO$_{3}$ crystal
	LIU Yong-Qi,QI Xin-Yan,LU Yang,LI Sha-Sha,CAO Zheng,KONG Yong-Fa,ZHANG Guo-Quan,BAI Jin-Tao
	Physics 20 December 2014
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	Abstract:We investigated the self-trapping and the self-deflection of a laser beam in a bulk and a photo-induced one-dimensional (1D) photonic lattice (PL) in pure LiNbO$_3$ crystal, respectively. The study results demonstrate that the probe beam will be self-trapped under the pyroelectric effect. The thermo-optic effect will speed up the focusing procedure of the light beam in the sample with low concentration of deep traps and result into the beam deflection. The probe beam can form a deflected discrete soliton in the PL. The waveguide coupling effect can strengthen the deflection. The experimental results are in agreement with the numerical simulations.
	TO cite this article:LIU Yong-Qi,QI Xin-Yan,LU Yang, et al. Self-trapping and self-deflection of a light beam in LiNbO$_{3}$ crystal[OL].[20 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4624709


	7. Electronic Structure and Photocatalytic Properties of AgI/TiO2 Composite: A First-Principles Study
	Jing Tao,Ma Xiangchao,Dai Ying
	Physics 17 November 2014
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	Abstract:The electronic structural and related photocatalytic properties of AgI /TiO2 composite are studied based on ?rst-principles density functional theory (DFT). Our results show that the AgI cluster states above the valence band maxium result in large elective gap narrowing of anatase TiO2 and the band gap of the composite depends on the interfacial structure of AgI cluster and TiO2 (001) surface. Further study demonstrates that the band gap decrease compared with TiO2 can be attributed to the structural distortions of the interface as well as to the strong interactions between the surface and clusters. More importantly, the calculated electronic structure indicates that the edges of valence band and conduction band are contributed by atoms of different sides of the composite interface, which favors the spatial separation of photogenerated carriers. This character can suppress the photogenerated carriers recombination and prevent the reduction of silver cations, which leads to the high photocatalytic activity and photostability of AgI/TiO2 composite observed in experiment.
	TO cite this article:Jing Tao,Ma Xiangchao,Dai Ying. Electronic Structure and Photocatalytic Properties of AgI/TiO2 Composite: A First-Principles Study[OL].[17 November 2014] http://en.paper.edu.cn/en_releasepaper/content/4617987


	8. Time behavior of field screening effects in GaAs photoconductive antenna as a terahertz emitter
	WANG Tianyi,YANG Zhengang,ZOU Si,WANG Shenglie,WANG Kejia,LIU Jinsong
	Physics 14 October 2014
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	Abstract:The field screening effects in small-size GaAs photoconductive antenna are investigated via the well-known pump and probe terahertz (THz) generation technique. The peak amplitude of the THz pulses excited by the probe laser pulse as a function of the pump-probe time delay is measured. An equivalent-circuit model is used to simulate the experimental data. Based on the good agreement between the simulation and experiment, the time behavior of the radiation and space-charge fields is simulated. The results show that the space-charge screening dominantly determines the device response in the whole time, while the radiation filed screening plays a key role in initial time which strongly affects the peak THz field. The parameter analysis is performed, which may be valuable on the optimum design for the antenna as a THz emitter.
	TO cite this article:WANG Tianyi,YANG Zhengang,ZOU Si, et al. Time behavior of field screening effects in GaAs photoconductive antenna as a terahertz emitter[OL].[14 October 2014] http://en.paper.edu.cn/en_releasepaper/content/4612237


	9. Oscillation effect in frequency domain current from a photoconductive antenna via a double-probe-pulse terahertz detection technique
	Qi Jin,Jinsong Liu,Kejia Wang,Zhengang Yang,Shenglie Wang,Kefei Ye
	Physics 29 September 2014
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	Abstract:Via constructing a special terahertz (THz) time domain spectroscopy system in which two femtosecond (fs) laser pulses are used as probe pulses to excite a photoconductive THz detector, the time behavior of the current from the detector is measured. The corresponding theoretical analysis is performed by the use of a well-known equivalent-circuit model. When the time domain current is transformed to frequency domain, an oscillation effect is observed. The oscillation frequency is decided by the time delay between the two probe pulses. The number of the extrema in the frequency domain current curve is proportion to the pulse interval in 0.1~2THz. A method to measure the interval of fs laser pulses is proposed.
	TO cite this article:Qi Jin,Jinsong Liu,Kejia Wang, et al. Oscillation effect in frequency domain current from a photoconductive antenna via a double-probe-pulse terahertz detection technique[OL].[29 September 2014] http://en.paper.edu.cn/en_releasepaper/content/4611750


	10. Dynamic control of spin wave spectra using spin-polarzied currents
	WANG Qi,ZHANG Huaiwu,TANG Xiaoli,Hans Fangohr,BAI Feiming,ZHONG Zhiyong
	Physics 17 September 2014
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	Abstract:We describe a method of controlling the spin wave spectra dynamically in a uniform nanostripe waveguide through spin-polarized currents. A stable periodic magnetization structure is observed when the current flows vertically through the center of nanostripe waveguide. After being excited, the spin wave is transmitted at the sides of the waveguide. Numerical simulations of spin-wave transmission and dispersion curves reveal a single, pronounced band gap. Moreover, the periodic magnetization structure can be turned on and off by the spin-polarized current. The switching process from full rejection to full transmission takes place within less than 3ns. Thus, this type magnonic waveguide can be utilized for low-dissipation spin wave based filters.
	TO cite this article:WANG Qi,ZHANG Huaiwu,TANG Xiaoli, et al. Dynamic control of spin wave spectra using spin-polarzied currents[OL].[17 September 2014] http://en.paper.edu.cn/en_releasepaper/content/4610304

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