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  • Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences  (20)
  • 1
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    1.054μm激光产生的高纯度黑腔辐射场
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 1995
    In:  Acta Physica Sinica Vol. 44, No. 3 ( 1995), p. 350-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 44, No. 3 ( 1995), p. 350-
    Materialart: Online-Ressource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.44.350
    Sprache: Unbekannt
    Verlag: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publikationsdatum: 1995
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  • 2
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    Neutron capture cross section measurements for 〈sup〉nat〈/sup〉Lu with different thickness
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2022
    In:  Acta Physica Sinica Vol. 71, No. 7 ( 2022), p. 072901-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 71, No. 7 ( 2022), p. 072901-
    Kurzfassung: The C〈sub〉6〈/sub〉D〈sub〉6〈/sub〉 detection system coupling with the pulse height weighting technique is widely used for experimentally measuring the neutron capture cross section. The thickness of sample used in the experiment directly affects the neutron beam time and the reliability of the experimental data. In the present work, we compare the lutetium (Lu) neutron capture reaction cross sections among the samles with different thickness, obtained by the C〈sub〉6〈/sub〉D〈sub〉6〈/sub〉 detection system of the back-streaming white neutron beam line at China spallation Neutron Source (CSNS back-n). The light response of the detection system is simulated with the consideration of the sample thickness by GEANT4 Monte Carlo simulation code. The 4〈sup〉th〈/sup〉 order polynomial pulse weight functions for different samples are determined by using the above light response function. In the experiment, the high precision capture yield distributions in the resonance energy region are obtained by measuring the longer flight distance and background. The experimental resonance parameters are deduced by analyzing the capture yield distribution with the R-matrix theory. The comparisons of the results of capture yield and the resonance parameters between the two groups show that the resonance curve of 1.06mm 〈sup〉nat〈/sup〉Lu sample changes due to its thickness effect, and there is a large difference between the experimental resonance parameters and ENDF/B-VIII.0 database. However, the experimental results of 0.207mm 〈sup〉nat〈/sup〉Lu sample can well accord with the ENDF/B-VIII. 0 data.
    Materialart: Online-Ressource
    ISSN: 1000-3290 , 1000-3290
    URL: Article
    DOI: 10.7498/aps.71.20212051
    Sprache: Unbekannt
    Verlag: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publikationsdatum: 2022
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  • 3
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    Studies of Be, Si doping regulated GaAs nanowires for phase transition and optical properties
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2021
    In:  Acta Physica Sinica Vol. 70, No. 20 ( 2021), p. 207804-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 70, No. 20 ( 2021), p. 207804-
    Kurzfassung: GaAs-based semiconductor doping technology, in which impurity energy levels are introduced into the band gap, can give rise to a decisive effect on its electrical and optical properties. When GaAs material is reduced to one-dimensional nanoscale, due to the increase of specific surface area, wurtzite- zinc blende coexisting structure is prone to appearing. GaAs nanowire doping can not only adjust its electro-optical properties, but also have a significant regulatory effect on its structural phase transition. The effects of beryllium (Be) and silicon (Si) doping on crystal structure and optical properties of gallium arsenide (GaAs) nanowires (NWs) are studied in this paper. Primitive, Si-doped and Be-doped GaAs NWs are grown on Si(111) substrates by molecular beam epitaxy in virtue of the self-catalyzed growth mechanism. The Raman spectra of primitive, Si-doped and Be-doped GaAs NWs are measured. The E2 mode peak unique to the WZ structure of primitive GaAs NWs is found in the Raman spectrum, and the E2 mode peak in the Raman spectrum of Si-doped GaAs NWs weakens or even disappears. Moreover, The E2 mode peak is not found in the Raman spectrum of Be-doped GaAs NWs. Furthermore, the structural changes of GaAs NWs are observed more intuitively by high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). The PL spectra show that the wurtzite (WZ)-zinc blende (ZB) mixed phase II-type luminescence exists in primitive GaAs NWs, then the luminescence disappears due to Si or Be doping and turns into impurity defect related luminescence.
    Materialart: Online-Ressource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.70.20210782
    Sprache: Unbekannt
    Verlag: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publikationsdatum: 2021
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  • 4
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    Analysis of ion noise with beam-wave interaction in klystron by two dimensional particle simulation method
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2006
    In:  Acta Physica Sinica Vol. 55, No. 10 ( 2006), p. 5368-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 55, No. 10 ( 2006), p. 5368-
    Kurzfassung: Ion noise in output signal of klystrons was obtained by particle-in-cell method. The interactions between beam electron, ion, secondary electron and electromagnetic field are illustrated. The mechanism of ion noise is analyzed. It shows that phase fluctuation in output signal is caused by the change of the beam current DC velocity which is affected by the change of the amount of ions. The ion interacts with beam electron and has no equilibration state. The amount of secondary electrons is small and it has little effect on ion noise, but its behaviors reflect the process of ion noise. The amplitude fluctuation of output signal is caused by the change of beam velocity and beam radius. It is also affected by the ion behaviors.
    Materialart: Online-Ressource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.55.5368
    Sprache: Unbekannt
    Verlag: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publikationsdatum: 2006
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  • 5
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    Design and optimization of integrated micro optical gyroscope based on a planar ring resonator
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2015
    In:  Acta Physica Sinica Vol. 64, No. 10 ( 2015), p. 107802-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 64, No. 10 ( 2015), p. 107802-
    Kurzfassung: In order to optimize the performance of the coupled resonator optical waveguide (CROW) gyroscope, a well-designed structure by optimizing the ring number and the transmission coefficient of the coupler is used as the core component of the planar waveguide optical gyroscope. The structure with double coupled ring resonator may possess large effective group refractive index to enhance angular sensing sensitivity was proposed. The concept of the Sagnac effect in this new double coupled ring resonator structure with a large effective group refractive index is investigated, it’s found that the rotation-induced phase shift is proportional to the effective group refractive index. On the basis of this effect, we calculate the general relation expression of theoretical rotation sensitivity and the effective group refractive index for this two-ring bidirectional CROW gyroscope by numerically simulation. Based on the relation, the phase shift characteristics of double coupled ring resonator and single ring resonator was analyzed. And the changing characteristics of the transmission coefficient of the couplers and the effective group refractive index was discussed based on the double cascaded ring resonator coupling mode theory. In the case of R1=R2=100 μm and ring transmission loss coefficient t1=t2=0.95, the generating condition of the largest effective group refractive index was obtained, according to the different effects of the couplers between rings and waveguide on the effective group refractive index. By using the parameters of R=100 μm and t=0.95, the sensitivity of a single ring resonator gyroscope is (104-105) °/h, and the sensitivity of double coupled ring resonator gyroscope can reach to 10 °/h. In summary, we show that the theoretical sensitivity of the double coupled ring gyroscope and single ring gyroscope are comparable when both have the same parameters. Using numerical and analytical methods, we demonstrated that coupling multiple resonators together can enhance rotation sensitivity. This research is important for applications of coupled ring resonator in optical angular velocity detection, and a promising regime to realize highly compact optical gyroscope.
    Materialart: Online-Ressource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.64.107802
    Sprache: Unbekannt
    Verlag: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publikationsdatum: 2015
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  • 6
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    Optimization of microsphere’s DQ product based on resonant micro-optical gyro
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2015
    In:  Acta Physica Sinica Vol. 64, No. 15 ( 2015), p. 154206-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 64, No. 15 ( 2015), p. 154206-
    Kurzfassung: Based on the development of high sensitivity, low cost, high integration and miniaturization demand of the resonant micro-optical gyro(R-MOG), and in order to achieve a resonant micro-optical-mechano-electrical integrative gyro having high sensitivity, a microsphere optical resonator key sensitive element for producting a cavity with high quality value (Q value) and large diameter in the field of integrated optical micro resonator is proposed, for making a resonant micro optical gyro. Microsphere optical resonator is made by means of water-hydrogen flame melting, and the SiO2 microspherical cavity is formed under the natural cooling and contraction surface tension. Microsphere optical resonator with its diameter D ranging from 300 μm to 2200 μm is fabricated by melting method with hydrogen flame as a heat source through controlling the hydrogen flame’s area by regulating the flow of hydrogen gas. The resonator serves as the key unit of the resonant optical gyro sensitive parts, its Q value and diameter D have direct effect on the performance of the resonant angular velocity sensor. Affect parameters on the performance of the microsphere optical resonator with different diameters is tested and processed to obtain the result. The corresponding relationship among Q value, DQ product, resonant micro-optical gyro’s sensitivity and microspherical cavity diameter D is analyzed, and the reason for them is given. With the increase of microspherical cavity diameter D, the Q value and DQ product reduce after rising first, while the gyro sensitivity goes to rise and fall. Based on the microsphere optical resonator DQ product optimization research, the resonant micro-optical gyro’s key sensitive unit with best parameters is obtained. When the microspherical cavity diameter D varies from 600 to 200 μm, the gyro sensitivity can meet the condition that δΩ D is 1260 μm, the Q value of microsphere optical resonator is 7.18×107 and the corresponding optimal limited sensitivity of the resonant micro-optical gyro is almost 10°/h, and this result adequately meets the requirement of business level gyro applications. This work can serve as an experimental foundation in the research of new type resonant micro optical gyro at chip level, high accuracy and low cost, and will also provide a technical reference for further study of high integrated and high precision resonant micro optical gyro.
    Materialart: Online-Ressource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.64.154206
    Sprache: Unbekannt
    Verlag: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publikationsdatum: 2015
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  • 7
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    A STUDY ON La-DOPED PbWO4 SCINTILLATING CRYSTAL
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2000
    In:  Acta Physica Sinica Vol. 49, No. 10 ( 2000), p. 2007-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 49, No. 10 ( 2000), p. 2007-
    Kurzfassung: The changes of defects in PbWO4 crystal caused by La dopant have been studied by means of positron annihilation lifetime and X-ray photoelectron spec trum (XPS).The results show that La dopant enhance the concentration of lead vac ancy (ＶPb) which can be described as the positron capture center in PbWO4 crystal,and lead vacancy will furthermore introduce low-valent oxygen center.We discuss the mechanism of La doped in PbWO4,and consi der that oxygen vacancy is restrained by doping of La,while lead vacancy density is increased by La dopant.
    Materialart: Online-Ressource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.49.2007
    Sprache: Unbekannt
    Verlag: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publikationsdatum: 2000
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  • 8
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    Entanglement of quantum node based on hybrid system of diamond nitrogen-vacancy center spin ensembles and superconducting quantum circuits
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2018
    In:  Acta Physica Sinica Vol. 67, No. 7 ( 2018), p. 070302-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 67, No. 7 ( 2018), p. 070302-
    Kurzfassung: Quantum entanglement is a kernel of quantum computation and quantum communication. We introduce a theoretical scheme to achieve the entanglement between two separated quantum nodes in a hybrid system. The proposed hybrid system based on diamond nitrogen-vacancy (NV) center spin ensemble is coherently coupled to a superconducting quantum circuit consisting of two quantum nodes and a quantum channel. Each node in our setup is composed of an NV center spin ensemble magnetically coupled to a superconducting coplanar resonator. The NV center spin ensemble composed of N identical and non-interacting NV spins, is placed in the magnetic field antinode of the superconducting coplanar resonator where the coupling is maximized. An array of superconducting quantum interference devices (SQUIDs) is inserted in the central conductor of resonator to make its frequency tunable with the magnetic flux threading through the SQUID loops. This flux is generated by passing current through an on-chip wire, so that the resonator can be brought in resonance with the NV center spins without changing their Zeeman splitting. Quantum qubits encoded into two separate nodes are connected by a vacuum superconducting coplanar resonator that is used as a quantum channel. This setup can potentially take the best elements of each individual system:NV center spin ensemble with longer coherence time capable of preparing, storing and releasing photonic quantum information, and the superconducting quantum circuits are easy to manipulate externally and can perform quantum logic gates to control quantum information rapidly. In order to realize the entanglement between two separated quantum nodes, firstly, we make a canonical transformation and obtain the Hamiltonian of the system that is reduced to two NV center spin ensembles resonantly coupled to a single mode of the superconducting coplanar resonator. Then we put forward the hybrid NV center spin-photon qubit encoding. In this hybrid encoding, the NV center spin and photon degrees of freedom enter on an equal footing into the definition of the qubit, in which case, quantum channel will switch on when three superconducting coplanar resonators are in resonance with each other, and all the manipulations can perform simply by tuning the frequencies of the superconducting coplanar resonators. Under the precise control of the evolution time, high fidelity entanglement between two separated quantum nodes is achieved. We show that this proposal can provide high fidelity quantum entanglement under realistic conditions, both in the resonant and the dispersive interaction cases. This hybrid quantum system will exhibit long coherence time and possess features like easy fabrication, integratability, and potential scalability. Furthermore, the quantum node composed of an NV center spin ensemble magnetically coupled to a superconducting coplanar resonator can be respectively integrated, which has practical applications in the realization of quantum information transmission and quantum entanglement among multiple quantum nodes.
    Materialart: Online-Ressource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.67.20172634
    Sprache: Unbekannt
    Verlag: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publikationsdatum: 2018
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  • 9
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    Structural properties of ZnO: In thin films prepared by sol-gel spin-coating technique
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2006
    In:  Acta Physica Sinica Vol. 55, No. 2 ( 2006), p. 748-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 55, No. 2 ( 2006), p. 748-
    Kurzfassung: ZnO∶In thin films with thickness varying in the 210—240nm range were prepared on quartz substrates by sol_gel spin_coating technique. The structural properties of these thin films (In/Zn=0, 1, 2, 3 and 5at%) were studied by grazing incidence X_ray diffraction, conventional X_ray diffraction, Fourier transform infrared spectroscopy, atomic force microscopy and photoluminescence. It is found that the ZnO∶In thin films are composed of the unstressed bulk layer packed up by large grains with (002) plane and the surface layer by small grains with (002) and (103) planes, and a proper In doping concentration can improve structural properties of ZnO thin films. The analytic results were further proved by grazing incidence X_ray diffraction at different incidence angles (α=1, 2, 3 and 5°).
    Materialart: Online-Ressource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.55.748
    Sprache: Unbekannt
    Verlag: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publikationsdatum: 2006
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  • 10
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    Statistical power consumption of RC interconnect tree with process fluctuation
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2011
    In:  Acta Physica Sinica Vol. 60, No. 3 ( 2011), p. 036601-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 60, No. 3 ( 2011), p. 036601-
    Kurzfassung: In order to effectively analyze the statistical power consumption of RC interconnect tree with process fluctuation, a method of constructing interconnect parasitic parameters and driving point admittance moments is first presented in this paper. Then, the expressions of mean and standard deviations of interconnect power consumption are obtained. The calculation results indicate that the errors of mean and standard deviations are less than 4.36 % and 6.68 % respectively compared with those calculated by the widely used Monte Carlo method. Results show that the proposed method has a good accuracy and high efficiency.
    Materialart: Online-Ressource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.60.036601
    Sprache: Unbekannt
    Verlag: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publikationsdatum: 2011
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