The Experts below are selected from a list of 35520 Experts worldwide ranked by ideXlab platform
Tran Quang - One of the best experts on this subject based on the ideXlab platform.
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coherent control of Spontaneous Emission near a photonic band edge a single atom optical memory device
Physical Review Letters, 1997Co-Authors: Tran Quang, Sajeev John, Mesfin Woldeyohannes, G S AgarwalAbstract:We demonstrate coherent control of Spontaneous Emission from a three-level atom with one resonant frequency near the edge of a photonic band gap. As a result of quantum interference and photon localization, Spontaneous Emission can be totally suppressed or strongly enhanced depending on the relative phase between the control and pump laser fields. The fractionalized steady state inversion of the atom depends sensitively on the initial conditions, suggesting the possibility of a phase-sensitive, optical memory device on the atomic scale.
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Spontaneous Emission near the edge of a photonic band gap
Physical Review A, 1994Co-Authors: Sajeev John, Tran QuangAbstract:We study Spontaneous Emission near the edge of a photonic band gap. Instead of a simple exponential decay in the vacuum, Spontaneous Emission displays an oscillatory behavior. A single photon-atom bound dressed state exhibits a fractional steady-state atomic population on the excited state. For a three-level atom we evaluate the spectral splitting and subnatural linewidth of Spontaneous Emission. In the presence of N-1 unexcited atoms we show that the collective time scale factor is equal to ${\mathit{N}}^{\mathrm{\ensuremath{\varphi}}}$, where \ensuremath{\varphi}=2/3 for an isotropic band gap and \ensuremath{\varphi}=1 or 2 for anisotropic two-dimensional or three-dimensional band edges, respectively.
Yoshihisa Yamamoto - One of the best experts on this subject based on the ideXlab platform.
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Spontaneous Emission coupling factor and mode characteristics of planar dielectric microcavity lasers
Physical Review A, 1993Co-Authors: Gunnar Bjork, H Heitmann, Yoshihisa YamamotoAbstract:The Spontaneous-Emission coupling factor β for planar microcavities without lateral confinement is measured and calculated for gain media with finite Spontaneous-Emission linewidth. It is shown that in order to maximize β, the Spontaneous-Emission linewidth of the gain medium must be smaller or equal to the cold-cavity linewidth. It is also shown that the planar-cavity geometry will give rise to spatial modes, and in order to maximize β one should pump only an area corresponding to one spatial mode. If the pumped area is larger than the lateral extent of a cavity mode, then the mode will grow laterally when pumped above threshold
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Spontaneous Emission coupling factor and mode characteristics of planar dielectric microcavity lasers
Physical Review A, 1993Co-Authors: Gunnar Bjork, H Heitmann, Yoshihisa YamamotoAbstract:The Spontaneous-Emission coupling factor \ensuremath{\beta} for planar microcavities without lateral confinement is measured and calculated for gain media with finite Spontaneous-Emission linewidth. It is shown that in order to maximize \ensuremath{\beta}, the Spontaneous-Emission linewidth of the gain medium must be smaller or equal to the cold-cavity linewidth. It is also shown that the planar-cavity geometry will give rise to spatial modes, and in order to maximize \ensuremath{\beta} one should pump only an area corresponding to one spatial mode. If the pumped area is larger than the lateral extent of a cavity mode, then the mode will grow laterally when pumped above threshold.
G S Agarwal - One of the best experts on this subject based on the ideXlab platform.
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coherent control of Spontaneous Emission near a photonic band edge a single atom optical memory device
Physical Review Letters, 1997Co-Authors: Tran Quang, Sajeev John, Mesfin Woldeyohannes, G S AgarwalAbstract:We demonstrate coherent control of Spontaneous Emission from a three-level atom with one resonant frequency near the edge of a photonic band gap. As a result of quantum interference and photon localization, Spontaneous Emission can be totally suppressed or strongly enhanced depending on the relative phase between the control and pump laser fields. The fractionalized steady state inversion of the atom depends sensitively on the initial conditions, suggesting the possibility of a phase-sensitive, optical memory device on the atomic scale.
Sajeev John - One of the best experts on this subject based on the ideXlab platform.
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coherent control of Spontaneous Emission near a photonic band edge a single atom optical memory device
Physical Review Letters, 1997Co-Authors: Tran Quang, Sajeev John, Mesfin Woldeyohannes, G S AgarwalAbstract:We demonstrate coherent control of Spontaneous Emission from a three-level atom with one resonant frequency near the edge of a photonic band gap. As a result of quantum interference and photon localization, Spontaneous Emission can be totally suppressed or strongly enhanced depending on the relative phase between the control and pump laser fields. The fractionalized steady state inversion of the atom depends sensitively on the initial conditions, suggesting the possibility of a phase-sensitive, optical memory device on the atomic scale.
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Spontaneous Emission near the edge of a photonic band gap
Physical Review A, 1994Co-Authors: Sajeev John, Tran QuangAbstract:We study Spontaneous Emission near the edge of a photonic band gap. Instead of a simple exponential decay in the vacuum, Spontaneous Emission displays an oscillatory behavior. A single photon-atom bound dressed state exhibits a fractional steady-state atomic population on the excited state. For a three-level atom we evaluate the spectral splitting and subnatural linewidth of Spontaneous Emission. In the presence of N-1 unexcited atoms we show that the collective time scale factor is equal to ${\mathit{N}}^{\mathrm{\ensuremath{\varphi}}}$, where \ensuremath{\varphi}=2/3 for an isotropic band gap and \ensuremath{\varphi}=1 or 2 for anisotropic two-dimensional or three-dimensional band edges, respectively.
Yanlin Song - One of the best experts on this subject based on the ideXlab platform.
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strong photonic band gap effect on the Spontaneous Emission in 3d lead halide perovskite photonic crystals
ChemPhysChem, 2018Co-Authors: Xue Zhou, Mingzhu Li, Kang Wang, H Li, Yanan Li, Chang Li, Yong Sheng Zhao, Yanlin SongAbstract:Stimulated Emission in perovskite-embedded polymer opal structures is investigated. A polymer opal structure is filled with a perovskite, and perovskite photonic crystals are prepared. The Spontaneous Emission of the perovskite embedded in the polymer opal structures exhibits clear signatures of amplified Spontaneous Emission (ASE) via gain modulation. The difference in refractive-index contrast between the perovskite and the polymer opal is large enough for retaining photonic-crystals properties. The photonic band gap has a strong effect on the fluorescence Emission intensity and lifetime. The stimulated Emission spectrum exhibits a narrow ASE rather than a wide fluorescence peak in the thin film.
