The Experts below are selected from a list of 142149 Experts worldwide ranked by ideXlab platform
Shu-lin Cong - One of the best experts on this subject based on the ideXlab platform.
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Study of Molecular Orientation steered by few-cycle terahertz pulse
Chemical Physics, 2020Co-Authors: Shuo Chai, Peng-fei Cui, Shu-lin CongAbstract:Abstract A theoretical scheme used for controlling Molecular Orientation with few-cycle terahertz pulse is proposed, taking the NaI molecule as an example. The time-dependent quantum wave packet theory method is used to accurately solve the time-dependent Schrodinger equation including rotational degrees of freedom and vibrational degrees of freedom. By optimizing the parameters of few-cycle terahertz pulse, the maximal Orientation, 0.824, is achieved. By modualting the carrier envelope phase (CEP) of few-cycle terahertz pulse, the enhancement and suppression of Molecular Orientation can be effectively controlled. Moreover, the Molecular Orientation degrees are dependent on the center frequency and the intensity of electric field of the few-cycle terahertz pulse. The numerical computation result shows that the Orientation of the NaI molecule can be effectively steered by using our scheme.
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Field-Free Molecular Orientation Induced by a Single-Cycle THz Laser Pulse Train
Communications in Computational Physics, 2016Co-Authors: Xiao-miao Zhang, Shu-lin CongAbstract:We investigate theoretically the field-free Orientation of CO molecules induced by a single-cycle THz laser pulse train. It is shown that the Molecular Orientation can be obviously enhanced by applying the pulse train. The laser intensity and pulse number have some effects on the Molecular Orientation. The high degree of field-free Molecular Orientation |⟨cos θ ⟩| max =0.9246 is obtained at temperature T =0 K. The variations of the maximum Orientation degree with the experimentally available pulse number and peak intensity are given. Temperature T has a considerable influence on the field-free Molecular Orientation. The maximal field-free Molecular Orientation at T =0, 10, 20 and 30 K for N =14 and E 0 =1.8 MV/cm are |⟨cos θ ⟩| max =0.9188, 0.7338, 0.6055 and 0.5154 in order, and the corresponding effective duration times of Molecular Orientation are Δ t =0.759, 0.432, 0.297 and 0.117 ps.
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Field-free Molecular Orientation by two-color shaped laser pulse together with time-delayed THz laser pulse
Laser Physics Letters, 2013Co-Authors: Jian Li, Jie Yu, Shu-lin CongAbstract:We theoretically investigate field-free Molecular Orientation by using an off-resonant two-color shaped laser pulse with a slow turn-on and rapid turn-off and a time-delayed THz laser pulse. It is shown that the Molecular Orientation can be greatly enhanced by applying this scheme compared to the two-color shaped or THz laser pulse alone. We discuss the effects of the rise time and the electric field amplitude of the two-color shaped laser pulse on Molecular Orientation, and demonstrate that effective Molecular Orientation can be achieved by a moderate intensity laser pulse with a short rise time. Furthermore, by changing the delay time between the two-color shaped laser pulse and the THz laser pulse and the carrier envelope phase of the THz laser pulse, the Molecular Orientation can be enhanced or lowered to some degree.
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FIELD-FREE Molecular Orientation IN DISSIPATIVE MEDIA BY A COMBINATION OF FEMTOSECOND AND THz LASER PULSES
Journal of Theoretical and Computational Chemistry, 2013Co-Authors: Yong Liu, Shu-lin CongAbstract:We present a theoretical scheme for achieving the field-free Molecular Orientation in dissipative media by a combination of femtosecond and THz laser pulses. Numerical calculations are performed by solving the quantum Liouville equation based on multilevel Bloch model. The Molecular Orientation degree is sensitive to the carrier-envelope phase of the THz pulse and the delay time between the two pulses. The Orientation and the rotational population of CO molecules in dissipative environment are computed at different pressures and temperatures. The influence of pure decoherence on the Molecular Orientation is also discussed.
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Field-free Molecular Orientation with chirped laser pulse
The European Physical Journal D, 2012Co-Authors: Jian Yang, Maodu Chen, Shu-lin CongAbstract:We demonstrate theoretically that an efficient field-free Molecular Orientation driven by the positively chirped laser pulse whose frequency is in the terahertz regime can be achieved, taking the LiH molecule for example. Exact numerical calculations are performed by solving the time-dependent Schrodinger equation including the vibrational and rotational degrees of freedom. The maximal Orientation degree of the LiH molecule | ⟨ cosθ ⟩ | max = 0.85 under the action of chirped laser pulse with the peak intensity of 4.78 × 108 W/cm2 at T = 0 K, which is larger than | ⟨ cosθ ⟩ | max=0.75 driven by the half-cycle laser pulse with the same intensity. The Molecular Orientation degree decreases with the increase of temperature.
Shian Zhang - One of the best experts on this subject based on the ideXlab platform.
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Selective excitation and control of the Molecular Orientation by a phase shaped laser pulse
RSC Advances, 2016Co-Authors: Yunxia Huang, Shian ZhangAbstract:We demonstrate that the selective excitation and further control of Molecular Orientation can be realized by a dual-color shaped laser pulse with V-style spectral phase modulation. Due to the instructive or destructive interference between the odd and even rotational wave-packet contributions, selective excitation of the Molecular Orientation is realized in the half rotational periods by the V-style phase modulated femtosecond laser pulse, and the positive and negative Molecular Orientations can be freely switched by varying the carrier-envelope phase of the shaped laser pulse. Moreover, by varying the modulation position of the V-style phase-shaped femtosecond laser pulse, the maximum degrees of the positive and negative Molecular Orientation in the half rotational periods can be continuously manipulated. Our scheme can provide a new method for the manipulation of the Molecular Orientation induced by the phase shaped laser pulse, and also has significant applications in the control of the Molecular rotational wave-packet.
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Controlling field-free Molecular Orientation with combined single- and dual-color laser pulses
Physical Review A, 2011Co-Authors: Shian Zhang, Tianqing Jia, Zugeng Wang, Zhenrong SunAbstract:We propose a scheme to achieve the field-free Molecular Orientation around the half rotational periods with the combination of single- and dual-color laser pulses. We show that the Molecular Orientation can be obtained and controlled by precisely controlling the time delay between the two laser pulses. Furthermore, we discuss the effect of the laser intensity and pulse duration of the single-color laser pulse on the Molecular Orientation created by the dual-color laser pulse, and show that the Molecular Orientation depends on the change in the alignment degree between the odd and even rotational wave-packet contributions created by the single-color laser pulse.
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Field-free Molecular Orientation by a multicolor laser field
Physical Review A, 2011Co-Authors: Shian Zhang, Junhui Shi, Hui Zhang, Tianqing Jia, Zugeng Wang, Zhenrong SunAbstract:We theoretically study the field-free Molecular Orientation by a multicolor laser field with a superposition of the fundamental wave and its harmonics. It is shown that the Molecular Orientation will be up to a maximum value pumped by the four-color laser field at the same laser intensity, and the Molecular Orientation direction and its degree can be controlled by varying the carrier-envelope phase of the four-color laser field. It is also indicated that the Molecular Orientation induced by a four-color laser field can be tremendously enhanced by applying another in-phase or out-phase four-color laser field at the beginning of the rotational wave-packet rephasing or the end of the rotational wave-packet dephasing.
Varun Vohra - One of the best experts on this subject based on the ideXlab platform.
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efficient inverted polymer solar cells employing favourable Molecular Orientation
Nature Photonics, 2015Co-Authors: Tomoyuki Koganezawa, Varun Vohra, Kazuaki Kawashima, Takeshi Kakara, Itaru Osaka, Kazuo Takimiya, Hideyuki MurataAbstract:Molecular Orientation in polymer solar cells is shown to play an important role in device performance.
Hideyuki Murata - One of the best experts on this subject based on the ideXlab platform.
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efficient inverted polymer solar cells employing favourable Molecular Orientation
Nature Photonics, 2015Co-Authors: Tomoyuki Koganezawa, Varun Vohra, Kazuaki Kawashima, Takeshi Kakara, Itaru Osaka, Kazuo Takimiya, Hideyuki MurataAbstract:Molecular Orientation in polymer solar cells is shown to play an important role in device performance.
Kazuaki Kawashima - One of the best experts on this subject based on the ideXlab platform.
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efficient inverted polymer solar cells employing favourable Molecular Orientation
Nature Photonics, 2015Co-Authors: Tomoyuki Koganezawa, Varun Vohra, Kazuaki Kawashima, Takeshi Kakara, Itaru Osaka, Kazuo Takimiya, Hideyuki MurataAbstract:Molecular Orientation in polymer solar cells is shown to play an important role in device performance.
