Magnetic Trapping of Molecules via Optical Loading and Magnetic Slowing

Lu, Hsin-I; Kozyryev, Ivan; Hemmerling, Boerge; Piskorski, Julia; Doyle, John M.

doi:10.1103/physrevlett.112.113006

Cited by 65 publications

(66 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, no one has yet used a Stark decelerator to decelerate these intense buffer-gas beams. Thus far, experimental approaches for decelerating such beams has been limited to direct laser slowing [8] and combining magnetic potentials with optical pumping [9].…”

Section: Introductionmentioning

confidence: 99%

Method for traveling-wave deceleration of buffer-gas beams of CH

et al. 2014

View full text Add to dashboard Cite

Cryogenic buffer-gas beams are a promising method for producing bright sources of cold molecular radicals for cold collision and chemical reaction experiments. In order to use these beams in studies of reactions with controlled collision energies, or in trapping experiments, one needs a method of controlling the forward velocity of the beam. A Stark decelerator can be an effective tool for controlling the mean speed of molecules produced by supersonic jets, but efficient deceleration of buffer-gas beams presents new challenges due to longer pulse lengths. Traveling-wave decelerators are uniquely suited to meet these challenges because of their ability to confine molecules in three dimensions during deceleration and their versatility afforded by the analog control of the electrodes. We have created ground state CH(X 2 Π) radicals in a cryogenic buffer-gas cell with the potential to produce a cold molecular beam of 10 11 mol./pulse. We present a general protocol for Stark deceleration of beams with a large position and velocity spread for use with a traveling-wave decelerator. Our method involves confining molecules transversely with a hexapole for an optimized distance before deceleration. This rotates the phase-space distribution of the molecular packet so that the packet is matched to the time varying phase-space acceptance of the decelerator. We demonstrate with simulations that this method can decelerate a significant fraction of the molecules in successive wells of a traveling-wave decelerator to produce energy-tuned beams for cold and controlled molecule experiments.

show abstract

Section: Introductionmentioning

confidence: 99%

Method for traveling-wave deceleration of buffer-gas beams of CH

et al. 2014

View full text Add to dashboard Cite

show abstract

“…In order to extract entropy from the molecules, we propose to use a continuous-wave (cw) laser to cool the slowed molecules via a single spontaneous emission event. Such single-photon cooling was first demonstrated in 1991 by Cornell, Monroe, and Wieman [45], and has been studied extensively in various forms [23,[46][47][48][49][50][51]. The scheme we describe here can be thought of as the momentum-space equivalent of these position-space ideas, and position-sensitive versions (such as that recently demonstrated for CaF molecules [23]) can be applied with this scheme to complete the phase-space compression in both directions.…”

Section: Phase-space Compressionmentioning

confidence: 99%

“…5, providing a simplification of the apparatus required to produce cold molecules. We did not numerically simulate the addition of a position-selective optical pumping laser or trap (which has been demonstrated recently with molecules [23]), but we find that the velocity compression alone increased the peak six-dimensional phase-space density by a factor of 16. The average stopping distance for the cooled molecules is 0.4 cm.…”

Section: Application To Strontium Monohydridementioning

confidence: 99%

“…This relationship demonstrates the connection between the deceleration force and the final effective temperature in this scheme. After their longitudinal momentum space density has been compressed, molecules can be subjected to a similar single-photon cooling step in position space through position-sensitive optical pumping into a trap [23,45,50,52]. In principle, each molecule needs to spontaneously emit only two photons during the entire process from beam to trap, demonstrating the large capacity each spontaneously emitted photon has for carrying away entropy.…”

Section: Phase-space Compressionmentioning

confidence: 99%

“…We then discuss how this deceleration technique (as well as most others that have been demonstrated) can be augmented by a single-photon velocity-cooling process that cools the decelerating molecules into a continuous source of cold, trappable molecules. A few-photon trap loading step such as demonstrated by Lu et al [23] may also be added subsequently to compress the position distribution. Molecules that have been slowed or trapped can then potentially be cooled to the ultracold regime through sympathetic [24], evaporative [25], or Doppler cooling.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Continuous all-optical deceleration and single-photon cooling of molecular beams

et al. 2014

View full text Add to dashboard Cite

Ultracold molecular gases are promising as an avenue to rich many-body physics, quantum chemistry, quantum information, and precision measurements. This richness, which flows from the complex internal structure of molecules, makes the creation of ultracold molecular gases using traditional methods (laser plus evaporative cooling) a challenge, in particular due to the spontaneous decay of molecules into dark states. We propose a way to circumvent this key bottleneck using an alloptical method for decelerating molecules using stimulated absorption and emission with a single ultrafast laser. We further describe single-photon cooling of the decelerating molecules that exploits their high dark state pumping rates, turning the principal obstacle to molecular laser cooling into an advantage. Cooling and deceleration may be applied simultaneously and continuously to load molecules into a trap. We discuss implementation details including multi-level numerical simulations of strontium monohydride (SrH). These techniques are applicable to a large number of molecular species and atoms with the only requirement being an electric dipole transition that can be accessed with an ultrafast laser.

show abstract

A Reversed Inverse Faraday Effect

Mou,

Yang,

Gallas

et al. 2023

Adv Materials Technologies

View full text Add to dashboard Cite

The inverse Faraday effect is a magneto‐optical process allowing the magnetization of matter by an optical excitation carrying a non‐zero spin. In particular, a right circular polarization generates a magnetization in the direction of light propagation and a left circular polarization in the opposite direction to this propagation. Herein, it demonstrates that by manipulating the spin density of light, i.e., its polarization, in a plasmonic nanostructure, a reversed inverse Faraday effect is generated. A right circular polarization will generate a magnetization in the opposite direction of the light propagation, a left circular polarization in the direction of propagation. Also, it demonstrates that this new physical phenomenon is chiral, generating a strong magnetic field only for one helicity of the light, the opposite helicity producing this effect only for the mirror structure. This new optical concept opens the way to the generation of magnetic fields with unpolarized light, finding application in the ultrafast manipulation of magnetic domains and processes, such as spin precession, spin currents, and waves, magnetic skyrmion or magnetic circular dichroism, with direct applications in data storage and processing technologies.

show abstract

Magnetic Trapping of Molecules via Optical Loading and Magnetic Slowing

Cited by 65 publications

References 42 publications

Method for traveling-wave deceleration of buffer-gas beams of CH

Method for traveling-wave deceleration of buffer-gas beams of CH

Continuous all-optical deceleration and single-photon cooling of molecular beams

A Reversed Inverse Faraday Effect

Contact Info

Product

Resources

About