The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Martial Ducloy - One of the best experts on this subject based on the ideXlab platform.
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Spontaneous emission rate of an excited atom placed near a nanofiber
Physical Review A, 2004Co-Authors: Vasily Klimov, Martial DucloyAbstract:The spontaneous decay rate of an excited atom placed near a dielectric cylinder is investigated. Special attention is paid to the case when the cylinder radius is small in comparison with Radiation Wavelength (nanofiber or photonic wire). In this case, the analytical expressions of the transition rates for different orientations of a dipole are derived. It is shown that the main contribution to decay rates is due to the quasistatic interaction of the atom dipole momentum with the nanofiber, and the contributions of guided modes are exponentially small. On the contrary, in the case when the radius of the fiber is only slightly less than the Radiation Wavelength, the influence of guided modes can be substantial. The results obtained are compared with the case of a dielectric nanospheroid and an ideally conducting wire.
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Spontaneous emission rate of an excited atom placed near a nanofiber
Optics Communications, 2002Co-Authors: Vasily Klimov, Martial DucloyAbstract:The spontaneous decay rates of an excited atom placed near a dielectric cylinder are investigated. A special attention is paid to the case when the cylinder radius is small in comparison with Radiation Wavelength (nanofiber or photonic wire). In this case, the analytical expressions of the transition rates for different orientations of dipole are derived. It is shown that the main contribution to decay rates is due to quasistatic interaction of atom dipole momentum with nanofiber and the contributions of guided modes are exponentially small. On the contrary, in the case when the radius of fiber is only slightly less than Radiation Wavelength, the influence of guided modes can be substantial. The results obtained are compared with the case of dielectric nanospheroid and ideally conducting wire.
Robert Warnock - One of the best experts on this subject based on the ideXlab platform.
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bursts of coherent synchrotron Radiation in electron storage rings a dynamical model
Physical Review Letters, 2002Co-Authors: M Venturini, Robert WarnockAbstract:Evidence of coherent synchrotron Radiation has been reported recently at the electron storage rings of several light source facilities. The main features of the observations are (i) a Radiation Wavelength short compared to the nominal bunch length, and (ii) a coherent signal showing recurrent bursts of duration much shorter than the Radiation damping time, but with spacing equal to a substantial fraction of the damping time. We present a model of beam longitudinal dynamics that reproduces these features.
Martin Kittler - One of the best experts on this subject based on the ideXlab platform.
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Light induced solid-phase crystallization of Si nanolayers in Si/SiO2 multiple quantum wells
Journal of Applied Physics, 2010Co-Authors: Teimuraz Mchedlidze, T. Arguirov, Simona Kouteva-arguirova, Martin KittlerAbstract:The process of light-induced crystallization (LIC) of nanometer-thick amorphous silicon (a-Si) layers in Si/SiO2 multiquantum wells (MQW) was investigated using Raman spectroscopy. In the present investigations, a laser was employed as the light source. An analysis of obtained and previously published results suggests strong influence of Radiation Wavelength on the outcome of the process. Namely, for certain ranges of Wavelengths and Radiation fluxes the crystallization proceeds through the light-induced solid phase crystallization (LISPC) process. An optimal set of Radiation Wavelength and flux values allows formation of fully crystallized and almost strain-free layers of nanocrystalline silicon (Si-nc). The difference in the absorption coefficients between a-Si and Si-nc was considered responsible for the obtained results. A mechanism explaining the Wavelength and the Radiation flux dependence was proposed. Understanding of the mechanism of LISPC in MQW structures would allow improving the LIC processes...
Vasily Klimov - One of the best experts on this subject based on the ideXlab platform.
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Spontaneous emission rate of an excited atom placed near a nanofiber
Physical Review A, 2004Co-Authors: Vasily Klimov, Martial DucloyAbstract:The spontaneous decay rate of an excited atom placed near a dielectric cylinder is investigated. Special attention is paid to the case when the cylinder radius is small in comparison with Radiation Wavelength (nanofiber or photonic wire). In this case, the analytical expressions of the transition rates for different orientations of a dipole are derived. It is shown that the main contribution to decay rates is due to the quasistatic interaction of the atom dipole momentum with the nanofiber, and the contributions of guided modes are exponentially small. On the contrary, in the case when the radius of the fiber is only slightly less than the Radiation Wavelength, the influence of guided modes can be substantial. The results obtained are compared with the case of a dielectric nanospheroid and an ideally conducting wire.
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Spontaneous emission rate of an excited atom placed near a nanofiber
Optics Communications, 2002Co-Authors: Vasily Klimov, Martial DucloyAbstract:The spontaneous decay rates of an excited atom placed near a dielectric cylinder are investigated. A special attention is paid to the case when the cylinder radius is small in comparison with Radiation Wavelength (nanofiber or photonic wire). In this case, the analytical expressions of the transition rates for different orientations of dipole are derived. It is shown that the main contribution to decay rates is due to quasistatic interaction of atom dipole momentum with nanofiber and the contributions of guided modes are exponentially small. On the contrary, in the case when the radius of fiber is only slightly less than Radiation Wavelength, the influence of guided modes can be substantial. The results obtained are compared with the case of dielectric nanospheroid and ideally conducting wire.
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Increase of spontaneous quadrupole transition rate in the vicinity of a dielectric microsphere
Optics Communications, 1996Co-Authors: Vasily Klimov, Vladilen S. LetokhovAbstract:It is shown that the spontaneous quadrupole transition probability in the vicinity of a microsphere may increase by several orders of magnitude and become commensurate with the dipole transition probability, provided the radius of curvature of the sphere is much smaller than the Radiation Wavelength.
M Venturini - One of the best experts on this subject based on the ideXlab platform.
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bursts of coherent synchrotron Radiation in electron storage rings a dynamical model
Physical Review Letters, 2002Co-Authors: M Venturini, Robert WarnockAbstract:Evidence of coherent synchrotron Radiation has been reported recently at the electron storage rings of several light source facilities. The main features of the observations are (i) a Radiation Wavelength short compared to the nominal bunch length, and (ii) a coherent signal showing recurrent bursts of duration much shorter than the Radiation damping time, but with spacing equal to a substantial fraction of the damping time. We present a model of beam longitudinal dynamics that reproduces these features.
