Laser-field-free three-dimensional molecular orientation

Takei, Daisuke; Mun, Je Hoi; Minemoto, Shinichirou; Sakai, Hirofumi

doi:10.1103/physreva.94.013401

Cited by 40 publications

(31 citation statements)

References 36 publications

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“…This can be realized by standard pulse-stretching in a pair of diffraction gratings [44]. Furthermore, it should be possible to convert the strong alignment to field-free alignment, lasting several picoseconds, by truncating the alignment pulse at its peak with the plasma shutter technique [45,46] or with spectral filtering [47].…”

Section: Discussionmentioning

confidence: 99%

Strongly aligned molecules inside helium droplets in the near-adiabatic regime

Shepperson

Chatterley

Søndergaard

et al. 2017

The Journal of Chemical Physics

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Iodine (I 2 ) molecules embedded in He nanodroplets are aligned by a 160 ps long laser pulse. The highest degree of alignment, occurring at the peak of the pulse and quantified by cos 2 θ2D , is measured as a function of the laser intensity. The results are well described by cos 2 θ2D calculated for a gas of isolated molecules each with an effective rotational constant of 0.6 times the gas-phase value, and at a temperature of 0.4 K. Theoretical analysis using the angulon quasiparticle to describe rotating molecules in superfluid helium rationalizes why the alignment mechanism is similar to that of isolated molecules with an effective rotational constant. A major advantage of molecules in He droplets is that their 0.4 K temperature leads to stronger alignment than what can generally be achieved for gas phase molecules -here demonstrated by a direct comparison of the droplet results to measurements on a ∼ 1 K supersonic beam of isolated molecules. This point is further illustrated for more complex system by measurements on 1,4-diiodobenzene and 1,4-dibromobenzene. For all three molecular species studied the highest values of cos 2 θ2D achieved in He droplets exceed 0.96.

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Section: Discussionmentioning

confidence: 99%

Strongly aligned molecules inside helium droplets in the near-adiabatic regime

Shepperson

Chatterley

Søndergaard

et al. 2017

The Journal of Chemical Physics

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“…If no static field is used, a rapid turn-off of the laser field allows to get orientation under field-free conditions. At low temperature, a very high degree of orientation can be obtained using such control strategies and a molecular quantum-state selection [32,33,34,35]. Control schemes in the sudden regime, where the duration of the control field is short with respect to the rotational period, have been also developed [36,37,38,39,40,12,41,42,43,44,45,46,47,48,49,50,51,52].…”

Section: Introductionmentioning

confidence: 99%

“…The description and the control of molecular orientation are not currently at the same degree of improvement, in particular from the experimental point of view. Molecular orientation was achieved in the adiabatic regime [30,31,32,33,34,35]. If no static field is used, a rapid turn-off of the laser field allows to get orientation under field-free conditions.…”

Section: Introductionmentioning

confidence: 99%

Observation of the field-free orientation of a symmetric-top molecule by terahertz laser pulses at high temperature

et al. 2016

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We investigate experimentally and numerically the field-free orientation of the symmetric top molecule of methyl-iodide at high temperature using a terahertz radiation generated by a plasma induced by a two-color laser beam. The degree of orientation is measured from the free-induction decay emitted by the sample. The observed experimental signal is reproduced with a good accuracy by numerical simulations.

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“…Three-dimensional control of the rotational dynamics of complex molecules poses a significant challenge in the context of alignment/orientation of molecules. In the past, combination of DC field and long sharply truncated optical pulse was proposed for orientation of asymmetric-top molecules under laser-field-free conditions 147,148 and more recently, pulsed laser fields with twisted polarization were shown to be effective for partial enantio-selective orientation of chiral molecules [65][66][67] (see Sec. 3.1).…”

Section: Three-dimensional Orientation Of Asymmetric-top Moleculesmentioning

confidence: 99%

Spatiotemporal rotational dynamics of laser-driven molecules

Lin

Tutunnikov

et al. 2020

Adv. Photon.

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Molecular alignment and orientation by laser fields has attracted significant attention in recent years, mostly due to new capabilities to manipulate the molecular spatial arrangement. Molecules can now be efficiently prepared for ionization, structural imaging, orbital tomography, and more, enabling, for example, shooting of dynamic molecular movies. Furthermore, molecular alignment and orientation processes give rise to fundamental quantum and classical phenomena like quantum revivals, Anderson localization, and rotational echoes, just to mention a few. We review recent progress on the visualization, coherent control, and applications of the rich dynamics of molecular rotational wave packets driven by laser pulses of various intensities, durations, and polarizations. In particular, we focus on the molecular unidirectional rotation and its visualization, the orientation of chiral molecules, and the three-dimensional orientation of asymmetric-top molecules. Rotational echoes are discussed as an example of nontrivial dynamics and detection of prepared molecular states.

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Laser-field-free three-dimensional molecular orientation

Cited by 40 publications

References 36 publications

Strongly aligned molecules inside helium droplets in the near-adiabatic regime

Strongly aligned molecules inside helium droplets in the near-adiabatic regime

Observation of the field-free orientation of a symmetric-top molecule by terahertz laser pulses at high temperature

Spatiotemporal rotational dynamics of laser-driven molecules

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