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Journal of the Optical Society of America B

Electrostatic surface storage ring for cold polar molecules

Lianzhong Deng, Yong Xia, Jianping Yin

Published Apr 26, 2010• 8 citations
Publisher

Abstract

An electrostatic storage ring for cold polar molecules formed on the surface of a dielectric substrate is proposed. We study the electric field distribution in free space generated by an insulator-embedded charged conductor ring and a bias field and analyze the behavior of weak-field-seeking CH3F molecules of state |J, K M|=|1,−1⟩ in the electrostatic storage ring. Results from Monte Carlo simulations of CH3F molecules being loaded into and confined in the storage ring are presented along with potential applications of the scheme in a variety of research areas using cold molecules.

DOI
10.1364/josab.27.000a88

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An electrostatic storage ring for cold polar molecules formed on the surface of a dielectric substrate is proposed. We study the electric field distribution in free space generated by an insulator-embedded charged conductor ring and a bias field and analyze the behavior of weak-field-seeking CH3F molecules of state |J, K M|=|1,−1⟩ in the electrostatic storage ring. Results from Monte Carlo simulations of CH3F molecules being loaded into and confined in the storage ring are presented along with potential applications of the scheme in a variety of research areas using cold molecules.
In order to meet the demands for laser manipulations and detection of cold molecules, we propose an optically accessible and controllable electrostatic surface storage ring for cold polar molecules on a chip, which is one based on extension and application of the three-wire surface guiding scheme [J. Opt. Soc. Am. B25, 1214 (2008)]. To our knowledge, this is the first real surface storage ring scheme. The spatial distribution of the electrostatic fields generated by two insulator-embedded charged rings and a grounded conductor plate is numerically calculated. Relationships between the height of the trap center above the surface and the setup parameters are analyzed in detail. Using OH radical molecules as a tester, the range of molecular velocities that the storage ring can confine is investigated. The dynamical process of weak-field-seeking OH molecules of state |J,KM〉=|3/2,−9/4〉 being loaded into and confined in the storage ring is studied using Monte Carlo simulations. Dependencies of translational temperature of molecules and their trapping efficiency in the storage ring on parameters of the setup and the initial molecular beam are examined. By incorporating a bunching function into our scheme, the number of round trips a trapped molecular packet makes can be improved by almost three times before getting spread out to fill the whole storage ring, as confirmed by numerical simulations.
We propose a simple scheme for trapping cold polar molecules in low-field seeking states on the surface of a chip by using a grounded metal plate and two finite-length charged wires that half embanked in an insulating substrate, calculate the electric field distributions generated by our charged-wire layout in free space and the corresponding Stark potentials for ND3 molecules, and analyze the dependence of the trapping center position on the geometric parameters. Moreover, the loading and trapping processes of cold ND3 molecules are studied by using the Monte Carlo method. Our study shows that the loading efficiency of the trap scheme can reach 11.5%, and the corresponding temperature of the trapped cold molecules is about 26.4 mK.
We propose a simple scheme for trapping cold polar molecules in low-field seeking states on the surface of a chip by using a grounded metal plate and two finite-length charged wires that half embanked in an insulating suhstrate, calculate the electric field distributions generated by our charged-wire layout in free space and the corresponding Stark potentials for ND3 molecules, and analyze the dependence of the trapping center position on the geometric parameters. Moreover, the loading and trapping processes of cold ND3 molecules are studied by using the Monte Carlo method. Our study shows that the loading efficiency of the trap scheme can reach 11.5%, and the corresponding temperature of the trapped cold molecules is about 26.4 inK.
We propose a scheme to guide and funnel cold polar molecules above the surface of an insulating substrate (i.e., a molecular chip) using an electrostatic field generated by the combination of three parallel charged wires. We calculate the spatial distributions of the electric fields from the above charged-wire layout and their Stark potential for cold CO molecules, and analyze the relationships between the electric field and the geometric parameters of our charged-wire system. Also, we calculate and study the straight and bent guiding efficiency of cold polar molecules (including the guiding efficiency in our molecular funnel) by Monte Carlo simulation. Our study shows that the proposed charged-wire scheme can be used to realize the controllable surface guiding of cold polar molecules in the weak-field-seeking state on a chip, and form various integrated molecular optical elements, even to generate a continous wave cold molecular beam on a chip. In addition, our theoretically calculated results are in good agreement with ones of Monte Carlo simulation, and the guiding efficiency in our molecular funnel can be higher than 90%.
We propose an optically accessible electrostatic trap scheme to confine cold polar molecules by using two charged spherical electrodes, and we calculate the corresponding electric field distribution and the Stark trapping potential for ND3 molecules. We also propose a desirable scheme to realize an efficient loading of cold polar molecules in weak-field-seeking states, and our simulated results show that the maximal loading efficiency can reach ∼14%. In addition, we briefly discuss some potential applications of our proposed trap scheme in the studies of optical-potential evaporative cooling and electrostatic surface traps for cold polar molecules.
We propose a novel scheme to trap cold polar molecules on the surface of an insulating substrate (i.e. a chip) by using an inhomogeneous electrostatic field, which is generated by the combination of a circular charged wire (a ring electrode) and a grounded metal plate. The spatial distributions of the electrostatic field from the above charged wire layout and its Stark potentials for CO molecules are calculated. Our study shows that when the voltage applied to the wire is U = 15 kV, a ring radius is R = 5 mm, the thickness of the insulating substrate is b = 5 mm, and a wire radius is r = 1 mm, the maximum efficient trapping potential (i.e., as equivalent temperature) for CO molecules is greater than 141.7 mK, which is high enough to trap cold polar molecules with a temperature of 50 mK in the low-field-seeking states.