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  • Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences  (95)
  • 2015-2019  (95)
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  • Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences  (95)
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  • 2015-2019  (95)
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  • 1
    Online Resource
    Online Resource
    Experimental result of back-streaming white neutron beam characterization at Chinese spallation neutron source
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2019
    In:  Acta Physica Sinica Vol. 68, No. 8 ( 2019), p. 080101-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 68, No. 8 ( 2019), p. 080101-
    Abstract: The Chinese spallation neutron source was completed in May 2018 and then subsequently commissioned. The Back-streaming white neutron beam line can be used in neutron nuclear data measurement, neutron physics research, and nuclear technology. In these experiments, it is necessary to know the neutron energy spectrum, the neutron flux, and the neutron beam profile of the neutron beam. In this paper, we present the preliminary measurements of these parameters. The neutron energy spectrum and neutron flux are measured by the time-of-flight method with a fission chamber equipped with 〈sup〉235〈/sup〉U and 〈sup〉238〈/sup〉U samples and a 〈sup〉6〈/sup〉Li-Si detector. The neutron beam profile is measured by a scintillator-CMOS detection system. The preliminary experimental measurements of the beam line are obtained. Among them, the energy spectrum measurement range of white neutrons is from eV to more than 100 MeV, which also gives an uncertainty analysis; the neutron fluence rate gives the full power value of the two experimental halls; the collimated white neutron beam spot is given under a diameter of 60 mm. The future plan is also given. The results of these experimental parameters can serve as the foundation for the future nuclear data measurement and detector calibration experiments of the beam line.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.68.20182191
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2019
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  • 2
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    Online Resource
    Erratum: Experimental result of back-streaming white neutron beam characterization at Chinese spallation neutron source
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2019
    In:  Acta Physica Sinica Vol. 68, No. 10 ( 2019), p. 109901-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 68, No. 10 ( 2019), p. 109901-
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.68.109901
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2019
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  • 3
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    Online Resource
    Tailoring structure and property of Ge-As-S chalcogenide glass
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2016
    In:  Acta Physica Sinica Vol. 65, No. 12 ( 2016), p. 127801-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 65, No. 12 ( 2016), p. 127801-
    Abstract: Chalcogenide glass has been considered to be a promising optical material for infrared (IR) transmission and nonlinear optics because of its favorable physical properties such as wide IR transparent windows, high linear and nonlinear refractive indices, and tunable photosensitivity. In many optical designs and practical applications, the refractive index (n) and optical bandgap (Eg) are two important parameters. Aiming to evaluate the composition dependence of the n and Eg in Ge-As-S chalcogenide glasses, a series of glasses with different stoichiometric characteristics are synthesized in quartz tubes under vacuum by the melt quenching technique. The structure, n and Eg of the glass are investigated by Raman spectroscopy, ellipsometry, and diffused reflectance spectroscopy, respectively.To eliminate thermal effects on the measured Raman spectra, the data are corrected by the Bose-Einstein thermal factor. Raman spectrum analyses indicate that Ge-As-S glass has a continuous network structure with interconnected [GeS4] tetrahedra and [AsS3] pyramids forming the backbone. When S amount is excess, S chains or S8 rings emerge. When S amount is deficient, As4S4/As4S3 molecules are formed, and even a large number of As-As/Ge-Ge homopolar bonds appear in the structure. The n values at different wavelengths are obtained by fitting the ellipsometry data with the Sellmeier dispersion model. The values of molar refractivity (Ri) of Ge, As and S elements are evaluated by using the measured n and density (d) of the investigated glass. The optimal values of Ri at 2-10 m for each element are RGe=9.83-10.42 cm3/mol, RAs=11.72-11.87 cm3/mol, and RS=7.78-7.86 cm3/mol, respectively; and the values decrease with increasing wavelength. The n of Ge-As-S glass is well quantitatively correlated to the d and the Ri of constituent elements, so that its value can be predicted or tailored within 1% deviation. A method to determine reliable Eg of a glass is proposed based on diffuse reflectance spectrum (DRS) of glass powders. To determine Eg of a glass, the absorption coefficient () is required to be as low as ～104 cm-1. For a 1-mm-thick bulk glass, the detection limit of a spectrophotometer is typically 100 cm-1. To obtain a reasonable Eg, the sample thickness used for the measurement must be less than 10 m. Such a thin glass sample is difficult to prepare. In comparison, DRS of glass powers measured using a spectrophotometer is able to provide valid absorption data in a 104 cm-1 range required for Eg determination. In this proposed method, the Kubelka-Munk function F(R), which is proportional to of the glass, is calculated from the measured DRS on the glass powders. The F(R) is calibrated by using the DRS of a glass (e.g. As2S3) with a known Eg. Using the same F(R) absorbance value, Eg of the Ge-As-S glass is determined based on DRS of powders measured under the same condition. The Eg of Ge-As-S glass is broadly correlated to the average bond energy of the glass. The glass containing more S atoms tends to show a higher average bond energy, and therefore exhibits a larger Eg.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.65.127801
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2016
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  • 4
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    Online Resource
    Refractive index and thermo-optic coefficient of Ge-Sb-Se chalcogenide glass
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2019
    In:  Acta Physica Sinica Vol. 68, No. 1 ( 2019), p. 017801-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 68, No. 1 ( 2019), p. 017801-
    Abstract: Ge-Sb-Se chalcogenide glass is environmentally friendly, and has wide infrared transmitting window, high optical nonlinearity, as well as good mechanical property. These make it a good material for infrared transmission and nonlinear optics. In optical designs, the refractive index (〈i〉n〈/i〉) and thermo-optic coefficient (〈i〉ζ〈/i〉) of the glass are key technical parameters. In order to predict and tailor the 〈i〉n〈/i〉 and 〈i〉ζ〈/i〉 of Ge-Sb-Se glass, compositions with different chemical and topological features are prepared, their 〈i〉n〈/i〉, 〈i〉ζ〈/i〉, density (〈i〉d〈/i〉) and volume expansion coefficient (〈i〉β〈/i〉) are measured, and the composition dependence of the parameters is systematically investigated. The chemical feature of the glass is quantified by the percentage deviation of the composition from the stoichiometric ratio and denoted as 〈i〉dSe〈/i〉. The topological feature is represented by the mean coordination number 〈〈i〉r〈/i〉〉 of each atom in the composition. It is shown that the 〈i〉n〈/i〉 of Ge-Sb-Se glass increases with 〈i〉d〈/i〉 increasing; the 〈i〉ζ〈/i〉 decreases almost linearly with 〈i〉β〈/i〉 increasing; and the 〈i〉β〈/i〉 decreases with 〈i〉dSe〈/i〉 decreasing or 〈〈i〉r〈/i〉〉 increasing. When the Ge content is fixed, the 〈i〉d〈/i〉 increases with 〈i〉dSe〈/i〉 decreasing or 〈〈i〉r〈/i〉〉 increasing; when the Sb concentration is fixed, the 〈i〉d〈/i〉 has a minimum value at 〈i〉dSe〈/i〉=0. Based on the measured 〈i〉d〈/i〉 and 〈i〉n〈/i〉, the molar refractivity (〈i〉R〈/i〉〈sub〉i〈/sub〉) of Ge, Sb and Se elements in a spectral range of 2-12 μm are calculated. The obtained value of 〈i〉R〈/i〉〈sub〉Ge〈/sub〉 is in a range of 10.16-10.50 cm〈sup〉3〈/sup〉/mol, 〈i〉R〈/i〉〈sub〉Sd〈/sub〉 in a range of 16.71-17.08 cm〈sup〉3〈/sup〉/mol, and 〈i〉R〈/i〉〈sub〉Se〈/sub〉 in a range of 11.15-11.21 cm〈sup〉3〈/sup〉/mol. When the 〈i〉R〈/i〉〈sub〉i〈/sub〉 and 〈i〉d〈/i〉 are used to compute 〈i〉n〈/i〉 of any composition, the discrepancy between the calculated value and the measured one is less than 1%. According to the measured 〈i〉ζ〈/i〉 and 〈i〉β〈/i〉, the thermal coefficients of the molar refractivity (〈i〉φ〈/i〉〈sub〉i〈/sub〉) of Ge, Sb, and Se elements in a wavelength region of 2-12 μm are computed. The optimal value of 〈i〉φ〈/i〉〈sub〉Ge〈/sub〉 is in a range of 21.1-22.6 ppm/K, 〈i〉φ〈/i〉〈sub〉Sb〈/sub〉 in a range of 7.2-8.4 ppm/K, and 〈i〉φ〈/i〉〈sub〉Se〈/sub〉 in a range of 90.2-94.2 ppm/K. When the 〈i〉φ〈/i〉〈sub〉i〈/sub〉 and 〈i〉β〈/i〉 are used to compute 〈i〉ζ〈/i〉 of any composition, the discrepancy between the calculated value and the measured value is less than 6 ppm/K.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.68.20181869
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2019
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  • 5
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    The study on high 〈i〉n〈/i〉 Rydberg state of La II
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2019
    In:  Acta Physica Sinica Vol. 68, No. 4 ( 2019), p. 043201-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 68, No. 4 ( 2019), p. 043201-
    Abstract: We analyze ionic spectrum of lanthanum via intermediate state (Xe)〈inline-formula〉〈tex-math id="M191"〉\begin{document}$ 5d6d \; ^3F_2 $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M191.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M191.png"/〉〈/alternatives〉〈/inline-formula〉 in the energy region 89872-91783 cm〈sup〉–1〈/sup〉, and the spectrum is obtained using five-laser resonance excitation in combination with a method of sequential ionization by a pulsed electric field and a constant electric field, and has been recalibrate in this work. Both of one strong and one weak autoionization Rydberg series converging to the La〈sup〉2+〈/sup〉 state are determined. Meanwhile, the two autoionization Rydberg series are assigned by relativistic multichannel theory (RMCT) within the framework of multi-channel quantum defect theory (MQDT). More specifically, the strong autoionization Rydberg series is assigned to 〈inline-formula〉〈tex-math id="M192"〉\begin{document}$ 5dnp\left(\dfrac{5}{2},\dfrac{1}{2}\right)_3 $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M192.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M192.png"/〉〈/alternatives〉〈/inline-formula〉 and/or 〈inline-formula〉〈tex-math id="M193"〉\begin{document}$ 5dnp\left(\dfrac{5}{2},\dfrac{1}{2}\right)_2 $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M193.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M193.png"/〉〈/alternatives〉〈/inline-formula〉, and the weak autoionization Rydberg series is assigned to 〈inline-formula〉〈tex-math id="M194"〉\begin{document}$ 5dnf\left(\dfrac{5}{2},\dfrac{5}{2}\right)_3 $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M194.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M194.png"/〉〈/alternatives〉〈/inline-formula〉 and/or 〈inline-formula〉〈tex-math id="M195"〉\begin{document}$ 5dnf\left(\dfrac{5}{2},\dfrac{5}{2}\right)_2 $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M195.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M195.png"/〉〈/alternatives〉〈/inline-formula〉. We focus on the behavior of quantum defect with excitation energy for high 〈inline-formula〉〈tex-math id="M196"〉\begin{document}$ n $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M196.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M196.png"/〉〈/alternatives〉〈/inline-formula〉 Rydberg states, which are sensitive to the existence of a external field. We find the breakdown of quantum defect regular behavior for a specific Rydberg series and autoionization Rydberg series of La〈sup〉+〈/sup〉 as the effective quantum number 〈inline-formula〉〈tex-math id="M197"〉\begin{document}$ n^\star〉67 $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M197.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M197.png"/〉〈/alternatives〉〈/inline-formula〉. Due to that our calculations, which are obtained by relativistic multichannel theory and included configuration interactions, are in basically agreement with that for experimental low 〈inline-formula〉〈tex-math id="M198"〉\begin{document}$ n $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M198.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M198.png"/〉〈/alternatives〉〈/inline-formula〉 (〈inline-formula〉〈tex-math id="M199"〉\begin{document}$ n^\star〈67 $\end{document}〈/tex-math〉〈alternatives〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M199.jpg"/〉〈graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="4-20181980_M199.png"/〉〈/alternatives〉〈/inline-formula〉) Rydberg states as well as small stray electric fields, we suggest that plasma formed by photoionization of La atoms in the second excitation step may be responsible for the breakdown of quantum defect regular behavior.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.68.20181980
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2019
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  • 6
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    Online Resource
    Propagation evolution of the off-axis ellipse vector beam
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2015
    In:  Acta Physica Sinica Vol. 64, No. 2 ( 2015), p. 024204-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 64, No. 2 ( 2015), p. 024204-
    Abstract: The propagation characteristics of the off-axis ellipse vector beam (OEVB) are studied in this paper. The analytic expressions of the electric field and the intensity after OEVB propagating in free-space are derived. Numerical results indicate that the intensity distribution of OEVB is asymmetric and the intensity distribution after propagating is determined by propagation distance, dislocation displacement and ellipticity. In addition to expanding, the intensity distribution of OEVB tends to steady-state distribution finally and the dark core of vector beam disappears gradually during propagation. The major axis and minor axis of the ellipse intensity distribution in the steady-state are exchanged with each other as compared with in the initial plane. The results can help us to understand the dynamic propagation characteristics of the ellipse vector beam under the off-axis situation, and they can also guide the calibration of the ellipse vector beam in practice.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.64.024204
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2015
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  • 7
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    Online Resource
    Spontaneous emission field excited by an atom near the μ-negative metamaterials slab
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2015
    In:  Acta Physica Sinica Vol. 64, No. 1 ( 2015), p. 014206-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 64, No. 1 ( 2015), p. 014206-
    Abstract: This paper discusses the spontaneous emission field of a two-level atom near a μ-negative metamaterial(MNG) slab, in which the surface modes are excited. the μ-negative metamaterial is a kind of artificial-microstructured materials possessing effective negative permeability and positive permittivity. According to Maxwell's equations and boundary conditions, the MNG slab supports only TE-polarized surface modes.We analyze the properties of the surface mode, i.e.the number of the surface mode and its symmetry or antisymmetry profiles, supported by the MNG slab with different permeability and thickness, and then study the influence of these characteristics on the spatial distribution of the spontaneous emission field in detail. Results show that the distance between the atom and the slab can affect the ratio of surface mode to the total atomic emission field. When the surface mode plays the dominate role, the spontaneous emission field of the atom on the nearest surface of MNG slab are directionally propagating along y-axis if the atomic dipole is along x-axis due to the TE-polarized surface mode. The atomic emission field on the other surface depends on the symmetry of the surface modes and their percentage. If the symmetric and antisymmetric surface modes coexist, the field intensity on the right surface is weakened or even disappears completely, but if there exists only symmetric or antisymmetric surface mode, the field intensity on the right surface is nearly identical with that on the left surface. These phenomena are significantly different from the case of atoms near a metal slab or a dielectric slab. Our results are useful for the controllable atomic emission and have potential application to the single-photon source.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.64.014206
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2015
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  • 8
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    Effect of Ni2O3 doping on the properties of single domain GdBCO bulk superconductors fabricated by a new modified top-seeding infiltration and growth process
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2015
    In:  Acta Physica Sinica Vol. 64, No. 7 ( 2015), p. 077401-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 64, No. 7 ( 2015), p. 077401-
    Abstract: Single-domain GdBCO bulk superconductor (20 mm in diameter) has been fabricated by a top-seeding infiltration and growth (TSIG) mathod, it has a new solid phase of [(1-x)(Gd2O3+1.2BaCuO2) + x Ni2O3] (where x =0, 0.02, 0.06, 0.10, 0.14, 0.18, 0.30, 0.50 wt%). Effect of Ni2O3 additions on the growth morphology, microstructure, critical temperature Tc, magnetic levitation force, and trapped flux of single-domain GdBCO bulks have been investigated. Results show that the single-domain GdBCO bulk can be gained when x is in the range of 0-0.50 wt%; and the Gd211 particles are not affected by the Ni2O3 doping in the samples. The Tc of the samples decrease from 92.5 K (x=0 wt%) to 86.5 K (x=0.50 wt%) when x increases from 0 to 0.50 wt%, which is caused by the substitution of Ni3+ for Cu2 +. Both of the levitation force and trapped field of the samples increase first and then decrease with the increase of x; the largest levitation force of 34.2 N is obtained for the samples with x=0.14 wt%, and the largest trapped field of 0.354 T is obtained for the samples with x=0.10 wt%. The change of the levitation force and trapped field of the samples is closely related to the doping content x. As is known, the doping of Ni2O3 can result in substitution of Ni3+ for Cu2+ at its site in GdBCO crystals, which can reduce the critical temperature Tc of the samples; although Tc and the physical properties of the samples is reduced with the increase in the doping amount of Ni2O3, but at the same time, the substitutions of Ni3 + for Cu2 + in GdBCO crystals can produce local lattice distortions, which can act as magnetic flux pinning centers to improve the properties of the samples. The highest Tc is obtained in the samples without any Ni2O3 additions (x=0), but the magnetic flux pinning force of the samples is weak, so both of the levitation force and trapped field of the samples are relatively lower. When the doping content x ≤ 0.14 wt%, although the Tc is reduced slightly, it still has a value higher than 90 K; and the magnetic flux pinning force in the samples, due to the substitutions of Ni3+ for Cu2 +, would increase with the increase of doping content x, and result in an enhancement of levitation force and trapped field. When the doping content x is greater than 0.14 wt%, the magnetic flux pinning force of the samples is still increasing with the increase of x, but the Tc of the sample is significantly reduced and even less than 90 K, and finally result in an decrease of levitation force and trapped field. Only when the doping amount of Ni2O3 is appropriate, both of Tc and magnetic flux pinning force are of a relative optimal value, and lead to an enhancement of levitation force and trapped field.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.64.077401
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2015
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  • 9
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    Characteristics of the spontaneous emission field and spectrum of a two-level atom in a dynamic photonic crystal
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2016
    In:  Acta Physica Sinica Vol. 65, No. 19 ( 2016), p. 194204-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 65, No. 19 ( 2016), p. 194204-
    Abstract: The spontaneous emission field and spectrum of a two-level atom, located in an isotropic photonic crystal with dynamic band edges, are investigated by means of numeric calculation. The investigation is expected to help comprehend the characteristics of the atomic spontaneous emission in the dynamic photonic crystal, and provide a possible way to control dynamically the spontaneous emission in photonic crystal. The expression of the spontaneous radiation field is obtained without using the far-zone approximation and the Weisskopf-Wigner approximation, and expected to be applicable in other relevant researches. In the investigation, the spontaneous radiation field and spectrum are calculated when the band edge frequency is unmodulated, or modulated by a step function or triangle function. In the unmodulated situation, the radiation field intensity tends to a constant which is equal to the intensity of the localized field component. The radiation field pulse presents a wave packet behavior as propagation distance increases. The components of the radiation field correspond one-to-one to the peaks in the spontaneous radiation spectrum. When the band edge frequency is modulated by step function, the radiation field intensity tends to a steady-state value after the modulation has happened. And the steady-state intensity is affected by the time when the modulation happens. The components of the non-localized field and the frequency of the localized field after modulation depend on the atomic transition frequency and the band edge frequency, and are identical to those in the unmodulated situation with the same parameters. When the band edge frequency is modulated by a triangle function, the field intensity presents a decaying quasi-periodic oscillation after a long enough time. The modulation frequency determines the frequency of the oscillation, and influences the decay rate. The radiation energy becomes sharp peaks around a set of the discrete frequencies which are evenly spaced with the modulation frequency. The central frequency of these frequencies depends on the atomic transition frequency and the value range of the band edge frequency. The modulation initial phase affects the intensity of the radiation field emitted in an initial period of time.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.65.194204
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2016
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  • 10
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    Spontaneous emission from a V-type three-level atom in a dynamic photonic crystal
    Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences ; 2017
    In:  Acta Physica Sinica Vol. 66, No. 1 ( 2017), p. 014202-
    Details
    In: Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 66, No. 1 ( 2017), p. 014202-
    Abstract: The spontaneous emission from a V-type three-level atom embedded in an isotropic photonic crystal with dynamic photonic band edge is studied. We consider the situation where the atom interacts with all possible radiation modes, and calculate numerically the evolution of atomic population without using Markov approximation. The calculation method can be used in related researches. In the present paper, we mainly discuss the effects of modulation parameters and the quantum interference on spontaneous emission when the band edge is modulated with step function or triangle function. We hope that the results can contribute to the applications in the dynamic photonic crystal environment in controlling the spontaneous emission via the quantum interference. The results show that in the step-modulated situation, the number of the photon-atom bound dressed states after the modulation has happened depends on atomic transition frequencies and the band edge frequency at that time, and is identical to the one in the unmodulated situation with the same parameters. The long-time evolution of the atomic population is affected by the time when the modulation happens. Depending on the system initial state, after the modulation has happened, the quantum interference can weaken the probability amplitude components corresponding to the photon-atom bound dressed states, and cause the upper-level population to decay quickly from a great value to a value near zero; or on the contrary, it can strengthen the bound dressed states, and make the upper levels retain a high population. In the modulated situation with trigonometric functions, after long enough time, the total upper-level population presents a decaying quasi-periodic oscillation behaviour. And the evolution of the total upper-level population tends to synchronize with the modulation, so the frequency of the quasi-periodic oscillation is approximately equal to the modulation frequency. But, the quantum interference can destroy the synchronization under some conditions. The decay rate of the total upper-level population is affected by the modulation frequency, and also by the initial state of the system and the angle between two dipole moment because of the quantum interference.
    Type of Medium: Online Resource
    ISSN: 1000-3290 , 1000-3290
    URL: Journal
    URL: Article
    DOI: 10.7498/aps
    DOI: 10.7498/aps.66.014202
    Language: Unknown
    Publisher: Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
    Publication Date: 2017
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