[en] This author introduces the result of a years approach on optimum design of low power high voltage generator that is preferred to use as an unit within the stable high voltage supplier to bias photomultipliers. The optimization is upon the comparison of the spike disturbing interference generating, limit of power transferred, transformer fabrication art, simplicity and key components supply between push-pull bi-direction drive and switch drive DC/DC converter type high voltage generator. Also a practice design under this policy is given as a sample. This approach is valuable as it would benefit the instrumentation widely

[en] The authors introduce a three step method to optimally bias a photomultiplier obtaining the best performance in single photo-electron counting. Instead of employing an activated spectroscopy which is not easy to repeat condition, the single electron emitting noise was observed to characterize photo multipliers behavior relating to single photo-electron counting. Three parameters were used to detail single electron spectrum shape being advanced than other reported way. This method test the influence of three settings that would affect the spectrum shape

[en] We have analysed the effects of dissipations on the single-photon transport in a coupled cavity array, with one of the cavities uncoupled and coupled to a two-level atom, respectively. A new approach analysing the dissipative properties of the coupled cavity arrays is first presented. We show that the coupling to a bath renormalizes the localized mode and the interaction between cavities. This permits us to redescribe the system via an effective Hamiltonian without having to mention the coordinates of the bath and then the single-photon transmission and reflection amplitudes are solved exactly. The theoretical results are in qualitatively good agreement with the experiments (Notomi et al 2008 Nature Photon. 2 741). It is shown that the dissipations of the cavity and of the atom affect distinctively the transmission of photons in the coupled cavity arrays. When the atom and the cavity are in tune, a incomplete reflect near the resonance area is mostly caused by the two-level atom dissipation, while for the large detuned cases, the reduced transmission appears to be mainly controlled by the cavity dissipation. A parameter to scale the quality of the dissipative arrays is also presented. (paper)

[en] We theoretically investigate the single-photon router using two dipole-dipole interaction (DDI) atoms embedded in a multichannel coupled cavity arrays (CCAs). When the atoms are symmetrically coupled to the cavity, the DDI influences both the height and position of the two peaks and gives rise to a shift in the position of the resonance. It is also shown that the effects of DDI are similar to the positive detuning. On the other hand, for the atom-cavity asymmetric coupling case, it is found that, Fano-line shapes are revealed evidently in the scattering spectra by adjusting the interatomic DDI. Moreover, Fano resonance can also be controlled by modulating the atom-cavity coupling strength and the detuning in the presence of DDI. Finally, in the incident channel the total reflection of the single photon is obtained based on the coherent resonance and the existence of the photonic bound states. Based on these characteristics, it is a feasible scheme to generate a Fano-typed router and it could be useful for designing the single-photon devices. Graphical abstract:

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[en] Using the master equation approach to a V-type three-level atom inside a high-finesse single-mode cavity in the strong coupling condition, we demonstrate the approximation of eliminating populations of atomic excited states, which is widely used in the field of the atom—cavity systems [Hechenblaikner G, Gangl M, Horak P and Ritsch H 1998 Phys. Rev. A 58 3030]; Liu L W, Tan T and Xu Y 2008 J. Mod. Opt. 56 968; Cho J, Angelakis D G and Bose S 2008 Phys. Rev. A 78 062338. This is reflected in the deviation of the population δ, of which the value is 10⁻³ ∼ 10⁻². We further find the deviation of the dipole force and demonstrate that the deviation of atomic population will not notably affect the dipole force of the atom in the strong coupling condition. A relevant experimental case is also presented. (atomic and molecular physics)

[en] A theoretical study is carried out for the modification and implication of the effect on the Ξ-type three level atom in a high-finesse optical cavity driven by light field including spontaneous emission and the cavity decay. Analytic expressions for the dipole force, the friction force, the optical potentials and the friction coefficient are obtained. Then the numerical and graphical methods are used to investigate the friction coefficient with the controlling parameters. It is shown that the friction coefficient is strongly dependent on the controlling parameters. The cooling rate can increase by one order of magnitude more than that of a two-level atomic system. The reason can be given using the dressed states and the Sisyphus cooling mechanism, which would stimulate further experimental investigations. (electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics)

[en] We have studied theoretically and numerically the enhanced cooling of a V-type three-level atom in a high-finesse optical cavity and shown that the cooling rate can be increased by one order of magnitude over that of a two-level atom, and the momentum amplitude tends to a stationary state much smaller than that of a two-level atom. We have further shown that the cooling rate can be significantly improved by using feedback and a time-dependent pump. (atomic and molecular physics)

[en] This article demonstrates the feasibility of an alternative strategy for producing temperature sensitive molecularly imprinted microspheres (MIMs) for solid-phase dispersion extraction of malachite green, crystal violet and their leuko metabolites. Thermo-sensitive MIMs can change their structure following temperature stimulation. This allows capture and release of target molecules to be controlled by temperature. The fabrication technique provides surface molecular imprinting in acetonitrile using vinyl modified silica microspheres as solid supports, methacrylic acid and N-isopropyl acrylamide as the functional monomers, ethyleneglycol dimethacrylate as the cross-linker, and malachite green as the template. After elution of the template, the MIMs can be used for fairly group-selective solid phase dispersion extraction of malachite green, crystal violet, leucomalachite green, and leucocrystal violet from homogenized fish samples at a certain temperature. Following centrifugal separation of the microspheres, the analytes were eluted with a 95:5 mixture of acetonitrile and formic acid, and then quantified by ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) with isotope internal calibration. The detection limits for malachite green, crystal violet and their metabolites typically are 30 ng·kg⁻¹. Positive samples were identified by UHPLC-MS/MS in the positive ionization mode with multiple reaction monitoring. The method was applied to the determination of the dyes and the respective leuko dyes in fish samples, and accuracy and precision were validated by comparative analysis of the samples by using aluminum neutral columns. (author)

[en] The mean-field dynamics of undistinguishable two-species Bose Josephson junction coupled to a single mode highfinesse optical cavity is investigated. From the Hamiltonian, the phase portrait and the stationary points are given. It is shown that the role of the interspecies interaction equals the intraspecies interaction under suitable conditions. As the interspecies interaction increases, the trapped atoms will start tunneling between the two wells unnaturally for some special cases

[en] Based on the quasi-boson approach, a model of a Λ-type three-level atom coupled to a X-shaped coupled cavity arrays (CCAs) is used to study the transport properties of a single-photon in the dissipative case, and a classical field is introduced to motivate the one transition of the Λ-type three-level atom (ΛTLA). The analytical expressions of transmission and transfer rate are obtained. Our results show that the cavity dissipation will obviously weaken the single-photon transfer rate where the incident energy of the single photon is resonant with the excited energy of the atom. Whether the cavity dissipation exists or not, the single photon can be almost confined in the incident channel at large detuning, and we can regulate the intensity of the classical field to control the total transmission of the single-photon. Graphical abstract: .