Deflection of Neutral Molecules using the Nonresonant Dipole Force

Stapelfeldt, Henrik; Sakai, Hirofumi; Constant, Éric; Corkum, P. B.

doi:10.1103/physrevlett.79.2787

Cited by 190 publications

(158 citation statements)

References 17 publications

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“…Although our arguments are rather general, we follow for certainty a deflection scheme that brings to mind the experiment by Stapelfeldt et al [1] who used a strong IR laser to deflect a CS 2 molecular beam, and then addressed a portion of the deflected molecules (at a preselected place and time) by an additional short and narrow ionizing pulse. Consider deflection (in z direction) of a linear molecule moving in x direction with velocity v x and interacting with a focused nonresonant laser beam that propagates along the y axis (Fig.…”

Section: Deflection Of Field-free Aligned Moleculesmentioning

confidence: 99%

“…To illustrate the performance of the procedure at real experimental conditions [1,4], we consider the deflection of CS 2 molecules at T = 5K (see Fig. 1), and plot the distribution of A at the peak of the deflecting field.…”

Section: Classical Treatment: Strong Deflecting Fieldmentioning

confidence: 99%

“…By controlling molecular translational degrees of freedom with laser fields [5][6][7][8][9][10], novel elements of molecular optics can be realized, including molecular lens [1,2] and molecular prism [3]. The mechanism of molecular interaction with a nonuniform laser field is rather clear: the field induces molecular polarization, interacts with it, and deflects the molecules along the intensity gradient.…”

Section: Introductionmentioning

confidence: 99%

“…Optical dipole forces acting on molecules in nonresonant laser fields is a hot subject of many recent experimental studies [1][2][3][4]. By controlling molecular translational degrees of freedom with laser fields [5][6][7][8][9][10], novel elements of molecular optics can be realized, including molecular lens [1,2] and molecular prism [3].…”

Section: Introductionmentioning

confidence: 99%

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Controlling molecular scattering by laser-induced field-free alignment

Gershnabel

Averbukh

2010

Phys. Rev. A

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We consider deflection of polarizable molecules by inhomogeneous optical fields, and analyze the role of molecular orientation and rotation in the scattering process. It is shown that molecular rotation induces spectacular rainbow-like features in the distribution of the scattering angle. Moreover, by preshaping molecular angular distribution with the help of short and strong femtosecond laser pulses, one may efficiently control the scattering process, manipulate the average deflection angle and its distribution, and reduce substantially the angular dispersion of the deflected molecules. We provide quantum and classical treatment of the deflection process. The effects of strong deflecting field on the scattering of rotating molecules are considered by the means of the adiabatic invariants formalism. This new control scheme opens new ways for many applications involving molecular focusing, guiding and trapping by optical and static fields.

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Section: Deflection Of Field-free Aligned Moleculesmentioning

confidence: 99%

Section: Classical Treatment: Strong Deflecting Fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Controlling molecular scattering by laser-induced field-free alignment

Gershnabel

Averbukh

2010

Phys. Rev. A

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“…The ability to control the alignment of molecules may have important purpose in stereodynamics [1], surface catalysis [2], trapping molecules [3], molecular focusing [4], and nanoscale design [5,6]. Experimentally, several methods have been used to control the orientations of molecules [7,8,9,10,11].…”

mentioning

confidence: 99%

Orientations of two coupled molecules

Liao

Chen

Chuu

2004

Chemical Physics Letters

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Orientation states of two coupled polar molecules controlled by laser pulses are studied theoretically. By varying the period of a series of periodically applied laser pulse, transition from regular to chaotic behavior may occur. Schmidt decomposition is used to measure the degree of entanglement. It is found that the entanglement can be enhanced by increasing the strength of laser pulse.PACS [5,6]. Experimentally, several methods have been used to control the orientations of molecules [7,8,9,10,11]. For example, by turning on a picosecond laser pulse adiabatically, the pendular stateshybrid of field-free molecular eigenstates [12,13,14] -can be created. A femtosecond laser pulse, like impulsive excitation, is found to be able to generate a field-free orientation [15,16].Since entangled states are fundamental for quantum information processing [17,18], many research works have been proposed to generate entanglement in quantumoptic and atomic systems [19,20]. In this Letter we propose a novel way to generate entanglement between two coupled identical polar molecules separated in a distance of tens of nanometers. Both molecules are irradiated by ultra-short pulses of laser light. Our study shows the entanglement induced by the dipole interaction can be enhanced by controlling the inter-molecule distance and the field strength of laser pulse.Consider now two identical polar molecules (separated by a distance of R ). There exists dipole-dipole interaction between these two molecules. Ultrashort halfcycle laser pulses are applied to both molecules [21]. The Hamiltonian of the system can be written aswhere L 2 j andh 2 2I (= B) are the angular momentum operator and rotational constant, respectively./R 3 is the dipole interaction between two molecules, where µ 1 and µ 2 are the dipole moments. For simplicity, the dipole moments of two molecules are assumed to be identical, i.e. µ 1 = µ 2 = µ. The field-molecule coupling can be expressed as H l = −µE (t) cos θ cos (ωt) − µE (t) cos θ ′ cos (ωt) ,where θ and θ ′ are the angles between the dipole moments and laser field. The laser profile is assumed to be Gaussian shape, i.e. E (t) = E 0 e − (t−to) 2 σ 2, where E 0 is the field strength, t 0 is the center of peak, and σ is the pulse duration. With these assumptions, the time-dependent Schrödinger equation can be solved by expanding the wave function in terms of a series of field-free spherical harmonic functions (2) where (θ, φ) and θ ′ , φ ′ are the coordinates of first and second molecule respectively. c lml ′ m ′ (t) are the timedependent coefficients corresponding to the quantum numbers (l, m; l ′ , m ′ ) and can be determined by solving the Schrödinger equations numerically. In above equation, total wavefunction has no spatial dependence since we keep inter-molecule separation R as a fixed parameter. One might argue that variation of R is inevitable because of the effects of laser fields or inter-molecule vibrations. However, recent experiments have shown that it is possible to resolve two individual molecules separ...

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References

2018

Molecules in Electromagnetic Fields

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Deflection of Neutral Molecules using the Nonresonant Dipole Force

Cited by 190 publications

References 17 publications

Controlling molecular scattering by laser-induced field-free alignment

Controlling molecular scattering by laser-induced field-free alignment

Orientations of two coupled molecules

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