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Applied Optics(9)
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	1. Stable structure and optical properties of fused silica with NBOHC-E’defect
	YANG Yang,LU Pengfei,WU Liyuan,SU Rui
	Physics 27 September 2015
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	Abstract:First-principles methods are used to simulate stable structure and optical properties of a 96-atom fused silica. The preferable structure of NBOHC-E’ (the non-bridging oxygen hole center with a three coordinate Si atom) pair defect is predicted to locate at 2.4 Å for the Si-O bond length. The quasi-particle G0W0 calculations are performed and an accurate bandgap can be obtained in order to calculate the optical absorption properties. In the case of NBOHC-E’ pair, two obvious absorption peaks can be observed in the absorption spectrum. The calculation reproduced the peak positions of the well-known optical absorption bands.
	TO cite this article:YANG Yang,LU Pengfei,WU Liyuan, et al. Stable structure and optical properties of fused silica with NBOHC-E’defect[OL].[27 September 2015] http://en.paper.edu.cn/en_releasepaper/content/4656192


	2. Ultrafast all-THz manipulation of spin coherence in antiferromagnetic DyFeO3 crystal
	Jin Zuanming,Ma Guohong
	Physics 17 September 2015
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	Abstract:THz time domain spectroscopy (TDS) with picosecond temporal resolution is used to achieve the spin coherent control in an antiferromagnetic DyFeO3 single crystal. It is demonstrated that by adjusting the arriving time between the excitation and control THz pulse, the amplitude of the free induction decay (FID) signals emitted from the precession of the macroscopic magnetization at the frequency of quasiferromagnetic mode (FM, 0.38 THz) and quasiantiferromagnetic mode (AFM, 0.52 THz) can be coherently driven to large amplitude or switched off, respectively. Furthermore, when FM and AFM spin precession are launched simultaneously, an appropriately timed sequence of the double THz pulses can be used to select any spin mode. Our experimental results attest that all-THz coherent control is an efficient and ultrafast way to switch the spin precession in antiferromagnet nondestructively.
	TO cite this article:Jin Zuanming,Ma Guohong. Ultrafast all-THz manipulation of spin coherence in antiferromagnetic DyFeO3 crystal[OL].[17 September 2015] http://en.paper.edu.cn/en_releasepaper/content/4654935

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	3. Anomalous optical forces on radially anisotropic nanowires
	CHEN Hongli,GAO Lei
	Physics 06 February 2015
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	Abstract:Full-wave electromagnetic scattering theory and Maxwell stress tensor integration techniques have been established to study the optical force on the radially anisotropic nanowires. The optical forces on the isotropic nanowires are dependent on the size of the nanowire and the wave vector in the media with the Rayleigh's law. However, the optical forces on the anisotropic nanowires have the anomalous behaviors under non-Rayleigh vanishing condition and non-Rayleigh diverging condition. Therefore, the optical forces on the anisotropic nanowires may be enhanced or reduced by tuning the anisotropic parameters. These results may promote the potential applications in the field of nanotechnology.
	TO cite this article:CHEN Hongli,GAO Lei. Anomalous optical forces on radially anisotropic nanowires[OL].[ 6 February 2015] http://en.paper.edu.cn/en_releasepaper/content/4631879


	4. 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


	5. Photocatalytic Performance in Oxide Nanomaterials
	ZHAI Yingjiao,LI Jinhua,CHU Xueying,XU Mingze,LI Xue,FANG Xuan,WEI Zhipeng,WANG Xiaohua
	Physics 22 January 2015
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	Abstract:As a result of the cumulatively environmental pollution and the worldwide fossil fuel reserves shortage, nanostructrued photocatalysts have attracted much attention as a potential solution due to their unique performance advantages. Over the past decades, different strategies for synthesis and modification of oxide materials on the nanometer scale have been developing rapidly. Therefore, it is of significance to highlight recent approaches in the development of oxide nanomaterials as activity-enhanced photocatalysts. This report presents recent research progress of the high photocatalytic activity of nanostructured photocatalysts for expansion of solar spectrum response and enhancement of charge separation efficiency. Significantly, all the researchers and their achievements in this field are making contributions to the development of catalytic industry and environment purification.
	TO cite this article:ZHAI Yingjiao,LI Jinhua,CHU Xueying, et al. Photocatalytic Performance in Oxide Nanomaterials[OL].[22 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4629681


	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. Thermal Noise Limited Ultrastable Laser for an Al+ Ion Optical Frequency Standard
	ZHANG Jie,ZENG Xiaoyi,SHI Xiaohui,LIU Yang,DENG Ke,LU Zehuang
	Physics 09 December 2014
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	Abstract:We demonstrate thermal noise limited ultrastable lasers for an Al+ ion optical frequency standard. The heart of an ultrastable laser is an Fabry Perot cavity made of ultra-low expansion material. We calculate the supporting positions of the cavity with quasi-static finite-element analysis. The cavity is housed in an ultrahigh vacuum chamber and the vacuum chamber is thermally stabilization with a sub-mK stability. We lock two diode lasers to two independent cavities, and measure the beat frequency between them. The linewidth of the beat frequency is measured to be about 0.88 Hz. The Allan deviation of a single laser is 1.0e-15 at 1s.
	TO cite this article:ZHANG Jie,ZENG Xiaoyi,SHI Xiaohui, et al. Thermal Noise Limited Ultrastable Laser for an Al+ Ion Optical Frequency Standard[OL].[ 9 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4622724


	8. Vacuum Induced Suppression and Enhancement of Four-wave Mixing in an Optical Cavity
	Chen Haixia,Zhang Yanpeng
	Physics 08 December 2014
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	Abstract:We report on an experimental study of vacuum-induced suppression and enhancement of four-wave mixing (FWM) signal in a composite atom-cavity system. The suppression ratio of the FWM signal can reach ninety percent. We attribute the suppression and enhancement to the atom-cavity coupling arising from a vacuum-induced Raman process. Also, the dressing asymmetry of the atom-cavity coupling is discussed and used to estimate the nonlinearity of atomic medium in the cavity. The suppression and enhancement can be interpreted by a dressed-state picture and agree with theoretical calculations. The investigation may find applications in optical switch and quantum memory controlled by cavity.
	TO cite this article:Chen Haixia,Zhang Yanpeng. Vacuum Induced Suppression and Enhancement of Four-wave Mixing in an Optical Cavity[OL].[ 8 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4622084


	9. Derivative method for both phase extraction and morphology identification of typical blood cells under interference microscopy
	Xu Yuanyuan,Wang Yawei,Ji Ying,Jin Weifeng
	Physics 06 December 2014
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	Abstract:We present a derivative method for phase information extraction in off-axis interference microscopy. By numerically calculating the interference term, the first-order and second-order derivatives of the interferogram, one can directly obtain the phase image. We illustrate the proposed method with both the theory analysis and some QPI simulations under typical blood cells' models. Compared with other typical phase extraction methods, this method has the ability of fast data processing. Furthermore, the first-order derivative of the phase is introduced to analyze the cell morphology, and a monocyte model and a red blood cell model are discussed as the examples to demonstrate the method. Results show that the first-order derivative of the phase can be used as a tool for the identification of blood cells.
	TO cite this article:Xu Yuanyuan,Wang Yawei,Ji Ying, et al. Derivative method for both phase extraction and morphology identification of typical blood cells under interference microscopy[OL].[ 6 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4622231


	10. Towards an 27Al+ ion optical clock
	XU Zetian,ZENG Xiaoyi,SHI Xiaohui,CHE Huang,DENG Ke,ZHANG Jie,LU Zehuang
	Physics 24 November 2014
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	Abstract:Magnesium ion which acts as the logic ion in 27Al+ ion optical clock is trapped and laser cooled in a linear ion trap. Rabi oscillation between two hyperfine ground states of 25Mg+ ion is observed and resonant frequency between two hyperfine ground states of 25Mg+ ion is measured. Earth magnetic field is compensated with three pairs of mutually perpendicular Helmholtz coils. Light shift induced by the Raman cooling beams is measured. With the photo-ionization laser of Al, Al+ ion is trapped together with Mg+ ion. The linewidth of the clock laser of the 27Al+ ion is measured to be about 0.8 Hz. The Allan deviation of the beat note from two independent lasers is 6.5*10-15 at 1s.
	TO cite this article:XU Zetian,ZENG Xiaoyi,SHI Xiaohui, et al. Towards an 27Al+ ion optical clock[OL].[24 November 2014] http://en.paper.edu.cn/en_releasepaper/content/4620210

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