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Contribution of interband effects caused by long-wavelength transverse optical phonons to electron-phonon coupling in doped polar insulators
Contribution of interband effects electron-phonon coupling doped polar insulators
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2010/11/22
We estimate the contribution of the long-wavelength el–TO–ph interaction and discuss the effect it has on electron pairing in doped polar systems like SrTiO3 and PbTe. The analytical and numerical res...
Enhanced Two-Photon Absorption in a Hollow-Core Photonic Bandgap Fiber
Enhanced Two-Photon Absorption Hollow-Core Photonic Bandgap Fiber
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2010/11/12
We show that two-photon absorption (TPA) in Rubidium atoms can be greatly enhanced by the use of a hollow-core photonic bandgap fiber. We investigate off-resonant, degenerate Doppler-free TPA on the ...
Theoretical Study of the Soft Optic Mode Scattering in a Relaxor Ferroelectric: the Strong Effect of the Depolarizing Fields
Theoretical Study of the Soft Optic Mode Scattering Relaxor Ferroelectric Depolarizing Fields
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2010/11/19
We analyze scattering of the transverse optic modes by spherically symmetric Polarized Nano Regions (PNR) in the paraelectric phase of relaxor ferroelectrics. Calculations have done in the frame of me...
Goos-Haenchen and Imbert-Fedorov shifts of a nondiffracting Bessel beam
Goos-Haenchen Imbert-Fedorov shifts nondiffracting Bessel beam
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2010/11/16
Goos-Haenchen and Imbert-Fedorov shifts are diffractive corrections to geometrical optics that have been extensively studied for a Gaussian beam that is reflected or transmitted by a dielectric inter...
Light Stop Searches at the LHC in Events with two b-Jets and Missing Energy
Light Stop Searches LHC in Events with two b-Jets Missing Energy
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2011/1/6
We propose a new method to discover light top squarks (stops) in the co–annihilation region at
the Large Hadron Collider (LHC). The bino–like neutralino is the lightest supersymmetric particle (LSP) ...
Optical activity tensor for radiating atomic and molecular systems
Optical activity tensor radiating atomic molecular systems
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2010/10/27
The optical activity tensor (OAT) is explicitly derived. It is shown that to evaluate a large
number of effects related to optical activity of some atomic/molecular system at arbitrary frequency ! of...
Angular momentum conversion of elliptically polarized beams focused by high numerical-aperture phase Fresnel zone plates
Angular momentum conversion elliptically polarized beams focused high numerical-aperture phase Fresnel zone plates
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2013/7/3
Based on the vectorial Debye theory, we in-vestigate the tight focusing of elliptically polarized light beams by high numerical-aperture (NA) phase Fresnel zone
plates (FZP). The conversion of the sp...
拉盖尔高斯涡旋光束的传输
涡旋光束袁 传输袁 光斑尺寸袁 相位分布
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2013/7/3
针对拉盖尔高斯涡旋光束袁 推导了其传输后目标平面上光电场的解析表达式袁 理论研究表明袁 传输一段距离后袁 对于拉盖尔高斯光束的光斑大小的描述袁 高斯光斑尺寸已经不再适用援 如果采用光强最亮处的半径来表示目标平面上的光斑大小则比较方便援 除了传输中的衍射导致光束展宽以外袁 横截面上光束的相位分布也发生了独特的变化援 等相位线由原来的射线转化为弧线袁 拓扑电荷数为正时袁 弧线朝顺时针方向弯曲袁 拓扑电...
新型锥透镜产生局域空心光束
新型锥透镜 bottle beam 轴棱锥 Bessel光
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2013/7/3
首次提出产生局域空心光束的另一类新型锥透镜模型援 讨论了凹凸两种模型袁 分别是在传统轴棱锥的底部磨削和胶合圆台结构形成援 研究结果表明平面波正入射新型凹锥透镜可产生单个正入射新型凸锥透镜可形成具有周期性的通过几何光学分析了产生的原理袁 计算了月的相关参数援 由衍射积分理论分析和模拟了新型锥透镜后的光强分布特性袁 所得分析结果与几何光学分析基本符合援。
Tight focusing of partially coherent, partially polarized vortex beams
tight focusing partially coherent partially polarized vortex
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2013/7/3
We study the tight focusing properties of partially coherent, partially polarized vortex beams through a high numerical aperture (NA) objective. The influence of the degree of polarization,the topolog...
Measuring the orbital angular momentum of elliptical vortex beams by using a slit hexagon aperture
Orbital angular momentum Elliptical vortex beam Hexagon aperture
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2013/7/3
The far- fi eld diffraction pattern of an elliptical vortex beam by a slit hexagon aperture is investigated theoretically and experimentally. It is found that the number of the dark spots or stripes i...
We show that the propagation of photons through a four-port beam-splitter is sensitively con-
trolled by the indistinguishability of the photons. Enhancement or suppression of output events
depend n...
Entanglement of light-shift compensated atomic spin waves with telecom light
Entanglement light-shift compensated atomic spin waves telecom light
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2010/10/20
Entanglement of a 795 nm light polarization qubit and an atomic Rb spin wave qubit for a storage time of 0.1 s is observed by measuring the violation of Bell’s inequality (S = 2.65±0.12). Long qubit s...
轴棱锥聚焦涡旋光束获得高阶贝塞尔光束
涡旋光束 轴棱锥 高阶贝塞尔光束 无衍射光束
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2013/7/3
采用轴棱锥聚焦涡旋光束,获得了高阶贝塞尔(Bessel)光束。首先,从理论模拟了涡旋光束经过轴棱锥聚焦后所获得的聚焦光强分布,结果表明,涡旋光束经过轴棱锥聚焦后可获得高阶贝塞尔光束。并且所获得的高阶贝塞尔光束的阶数与涡旋光束的拓扑电荷数相同。进而,从实验获得高阶贝塞尔光束,并且采用不同锥角的轴棱锥对涡旋光束进行聚焦,研究轴棱锥的锥角对高阶贝塞尔光束的影响,结果表明,在轴棱锥相应的最大准直距离内所得...
Quantum chaos of a mixed, open system of kicked cold atoms
Quantum chaos mixed open system
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2010/10/20
We suggest and demonstrate an all-optical experimental setup to observe and engineer entanglement oscillations of a pair of polarization qubits in a non-Markovian channel. We generate entangled photon...