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Готові списки джерел за темами / Dipole trapping

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Добірка наукової літератури з теми "Dipole trapping"

Автор: Grafiati

Опубліковано: 10 березня 2023

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Статті в журналах з теми "Dipole trapping"

1

Al-Marzoug, S. M. "Scattering of a discrete soliton by impurity in dipolar Bose–Einstein condensates." International Journal of Modern Physics B 28, no. 30 (December 4, 2014): 1450214. http://dx.doi.org/10.1142/s0217979214502142.

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Scattering of a discrete soliton by a single impurity in dipolar Bose–Einstein condensate is investigated numerically. The results show that the increase of the strength of dipolar interactions leads to repeated reflection, transmission and trapping regions due to energy exchange between the center of mass motion and the internal modes of the impurity. However, increasing the strength of the attractive nonlocal dipole–dipole interaction will result in different scattering windows. While the dipole–dipole interaction can significantly expand the trapping region of the system, nevertheless transmission resonances through the impurity are still observed.

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2

Webster, S. A., G. Hechenblaikner, S. A. Hopkins, J. Arlt, and C. J. Foot. "Dipole force trapping of caesium atoms." Journal of Physics B: Atomic, Molecular and Optical Physics 33, no. 19 (September 15, 2000): 4149–55. http://dx.doi.org/10.1088/0953-4075/33/19/323.

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3

Williams, J. F., J. B. Wang, and C. J. Carter. "A Monte Carlo Study of Radiation Trapping Effects." Australian Journal of Physics 50, no. 3 (1997): 645. http://dx.doi.org/10.1071/p96099.

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A Monte Carlo simulation of radiative transfer in an atomic beam is carried out to investigate the effects of radiation trapping on electron–atom collision experiments. The collisionally excited atom is represented by a simple electric dipole, for which the emission intensity distribution is well known. The spatial distribution, frequency and free path of this and the sequential dipoles were determined by a computer random generator according to the probabilities given by quantum theory. By altering the atomic number density at the target site, the pressure dependence of the observed atomic lifetime, the angular intensity distribution and polarisation of the radiation field is studied.

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4

Sripakdee, Chatchawal. "The Investigation of WGM Effective Potential from Micro PANDA Ring Resonator." Applied Mechanics and Materials 866 (June 2017): 337–40. http://dx.doi.org/10.4028/www.scientific.net/amm.866.337.

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In this work, the whispering gallery mode effective potential generated by micro PANDA ring resonator for a two level system of atom – electric field coupling is investigated and presented. The depth of trapping potential is proportional to electric intensity and damping rate of transition of dipole polarization. The trial harmonics potential well is established by using dipole potential under ac Stark effect. The optimum intensity and lifetime for each WGM trapping wavelengths under the effect of thermal noise is reported.

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5

Goldstein, E., P. Pax, K. J. Schernthanner, B. Taylor, and P. Meystre. "Influence of the dipole-dipole interaction on velocity-selective coherent population trapping." Applied Physics B Laser and Optics 60, no. 2-3 (1995): 161–67. http://dx.doi.org/10.1007/bf01135858.

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6

DAVYDOVA, T. A., and V. M. LASHKIN. "Drift-wave trapping by drift vortices." Journal of Plasma Physics 58, no. 1 (July 1997): 11–18. http://dx.doi.org/10.1017/s002237789700562x.

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The possibility for a drift dipole vortex to trap free drift waves is demonstrated. Drift perturbations can be trapped near the centre of the vortex or at its sides. The localization domain and eigenfrequencies of trapped modes are obtained.

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7

Hu, Fang-Qi, and Ju-Kui Xue. "Breathing dynamics of a trapped impurity in a dipolar Bose gas." Modern Physics Letters B 28, no. 22 (August 30, 2014): 1450185. http://dx.doi.org/10.1142/s0217984914501851.

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With the consideration of impurity-bosons coupling and dipole–dipole interactions (DDI), we study the breathing dynamics of a harmonically trapped impurity interacting with a separately trapped background of dipolar Bose gas. By using the variational approach, the breathing equations, the breathing frequencies and the effective potentials governing the breathing dynamics of the impurity in dipolar gas are obtained. The effects of DDI, impurity-bosons interaction and external trapping potentials on breathing dynamics of impurity are discussed. We find that, because of the anisotropic and long-range characters of DDI, the effects of DDI, impurity-bosons interaction and external trapping potentials on breathing dynamics of impurity are strongly coupled. DDI has significant modification on dynamics, which depends on the external trapping potentials. For spherically symmetric external trapping, DDI makes the impurity more cigar-shaped along axial direction and the breathing oscillation in radial direction is suppressed by DDI. However, the effect of DDI on the breathing dynamics is weakened for cigar-shaped external trapping. Interestingly, for strong external pancake-shaped trapping, the symmetries of the breathing dynamics with respect to attractive and repulsive impurity-bosons coupling recover. Especially, for some critical value of impurity-bosons coupling, the breathing dynamics undergo a sudden quench.

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8

Dubau-Assibat, Nathalie, Antoine Baceiredo, and Guy Bertrand. "Lawesson's Reagent: An Efficient 1,3-Dipole Trapping Agent." Journal of Organic Chemistry 60, no. 12 (June 1995): 3904–6. http://dx.doi.org/10.1021/jo00117a050.

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9

Aldossary, O. M. "Bottle atom trapping configuration by optical dipole forces." Journal of King Saud University - Science 26, no. 1 (January 2014): 29–35. http://dx.doi.org/10.1016/j.jksus.2013.08.002.

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10

Lee, Jong-Hoon, Junghwan Kim, Geunjin Kim, Dongguen Shin, Song Yi Jeong, Jinho Lee, Soonil Hong, et al. "Introducing paired electric dipole layers for efficient and reproducible perovskite solar cells." Energy & Environmental Science 11, no. 7 (2018): 1742–51. http://dx.doi.org/10.1039/c8ee00162f.

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Дисертації з теми "Dipole trapping"

1

Harsono, Andrian. "Dipole trapping and manipulation of ultra-cold atoms." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437007.

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2

Levonian, David (David S. ). "A Cavity-stabilized diode laser for dipole trapping of ytterbium." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/105998.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2015.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 99-103).
Bad-cavity lasers using a gain medium with a narrower linewidth than the laser cavity have the potential to achieve very narrow linewidths and extremely long coherence times. Such lasers could serve as active frequency standards or enable very-long-baseline interferometric telescopes at optical frequencies. The 6s6p³P₀ to 6s²¹S₀ ground state transition in ¹⁷¹Yb is a promising candidate for the gain medium of a bad-cavity laser due to its 44 mHz linewidth. For ytterbium to be used efficiently as a gain medium, its inhomogeneous broadening must be suppressed to a level lower than the linewidth of its gain transition. In this thesis, I design, implement, and characterize an optical lattice trap for ytterbium atoms. The trap consists of a diode laser which is frequency stabilized to an adjustable-length cavity where the ytterbium atoms are trapped. The length of this cavity is then locked by comparison of the laser frequency to a stable reference cavity. The resulting standing wave has high enough intensity that the recoil energy of the gain transition is smaller than the energy spacing between motional modes of the trapped atoms. This situation is known as the Lamb-Dicke regime and means that there is an absence of recoil broadening. The large spacing between motional modes of the trap also enables sideband resolved cooling of the atoms, which allows cooling to temperatures of 3 [mu]K, near the ground state of the trapping potential. Additionally, if the wavelength of the optical lattice is chosen to be at the magic wavelength for ytterbium, where the relative AC Stark shift for the two levels of the gain transition is zero to first order, there is no broadening due to varying intensity in the trap. Since the Doppler effect, recoil broadening and the AC Stark shift are the main sources of inhomogeneous broadening, this trapping scheme is expected to suppress inhomogeneous broadening to a level of 1 Hz.
by David Levonian.
M. Eng.

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3

Van, Dongen Janelle. "Simultaneous cooling and trapping of 6Li and 85/87Rb." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/351.

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This thesis provides a summary of the laser system constructed in the Quantum Degenerate Gases Laboratory for laser cooling and trapping of 85/87Rband 6Li as well as of experiments that have been pursued in our lab to date. The first chapter provides an overview of the experimental focus of the QDG lab. The second and third chapters provide the fundamental theory behind laser cooling and trapping. The fourth chapter provides details of the laser system. The fifth chapter describes an experiment performed on the subject of dual-injection, performed in collaboration with Dr. James Booth of the British Columbia Institute of Technology (BCIT) involving the dual-injection of a single slave amplifier. The last chapter describes the progress made on the experimental setup needed for the study of Feshbach resonances between 85/87Rb and 6Li and the photoassociative formation of molecules.

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4

Gatto, Alexandro [Verfasser]. "Trapping fermionic potassium atoms in a quasi-electrostatic optical dipole potential / Alexandro Gatto." Bonn : Universitäts- und Landesbibliothek Bonn, 2012. http://d-nb.info/104408149X/34.

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5

Webster, Stephen. "Prospects for Bose-Einstein condensation in caesium : cold collisions and dipole-force trapping." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325563.

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6

Blackhurst, Tyler D. "Numerical Investigation of Internal Wave-Vortex Dipole Interactions." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3133.

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Three-dimensional linear ray theory is used to investigate internal waves interacting with a Lamb-Chaplygin pancake vortex dipole. These interactions involve waves propagating in the same (co-propagating) and opposite (counter-propagating) horizontal directions as the dipole translation. Co-propagating internal waves in the vertical symmetry plane between the vortices of the dipole can approach critical levels where the wave energy is absorbed by the dipole or where the waves are overturned and possibly break. As wave breaking cannot be simulated with this linear model, changes in wave steepness are calculated to aid in estimating the onset of breaking. Counter-propagating internal waves in the vertical symmetry plane can experience horizontal and vertical reflections, including turning points similar to waves in two-dimensional steady shear. Wave capture is also a possible effect of either type of interaction, depending on initial wave properties and positioning relative to the vortex dipole. Away from the vertical symmetry plane, a spanwise converging (focusing) and diverging (defocusing) of wave energy is observed in co- and counter-propagating interactions as symmetric off-center rays interact with the dipole's individual vortices. Some off-center rays experience multiple horizontal refractions similar to wave trapping.

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7

Kalita, Mukut R. "Search for a Permanent Electric Dipole Moment of ²²⁵Ra." UKnowledge, 2015. http://uknowledge.uky.edu/physastron_etds/34.

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The observation of a permanent electric dipole moment (EDM) in a non-degenerate system would indicate the violation of discrete symmetries of Time reversal (T) or combined application of Charge (C) and Parity (P) symmetry violation through the CPT theorem. The diamagnetic 225Ra atom with nuclear spin I=1/2 is a favorable candidate for an EDM search. Experimental sensitivity to its EDM is enhanced due to its high atomic mass and the increased Schiff moment of its octupole deformed nucleus. An experimental setup is developed where laser cooled neutral radium atoms are collected in a magneto-optical trap (MOT). The collected atoms are transported 1 meter with a far off-resonant optical dipole trap (ODT) and then the atoms are transferred to a second standing-wave ODT in an experimental chamber. The atoms are then optically polarized and allowed to Larmor precess in parallel and antiparallel electric and magnetic fields. The difference between the Larmor precession frequency for parallel and antiparallel fields is experimentally determined to measure the EDM. This thesis is about the first measurement of the EDM of the 225Ra atom where an upper limit of |d(225Ra)|<5.0*10-22 e cm (95\% confidence) is reached.

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8

Krasselt, Cornelius. "Dynamik der Photo-Lumineszenz-Unterbrechung von Halbleiter-Nanokristallen in elektrischen Feldern." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-172910.

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Diese Arbeit untersucht die Photo-Lumineszenz (PL)-Unterbrechung (Blinken) einzelner in Polymer-Nanopartikeln eingebetteter CdSe/CdS Halbleiter-Nanokristalle (Quantenpunkte) im Einfluss elektrischer Gleich- und Wechselfelder mittels Weitfeld-Mikroskopie. Hierbei emittieren die einzelnen Quantenpunkte trotz kontinuierlicher Anregung mit einer zwischen hellen An- und dunklen Aus-Zuständen variierenden PL-Intensität. Die Ergebnisse zeigen, dass die Dynamik dieses Blinkens durch Wechselfelder stark beeinflusst wird und von deren Feldstärke, teilweise auch deren Feldfrequenz abhängt. Für zunehmende Feldstärken lässt sich ein schnellerer Wechsel zwischen An- und Aus-Zuständen (erhöhte Blinkfrequenz) beobachten, der von einer reduzierten Häufigkeit langer An- und Aus-Ereignisse begleitet wird. Der Verlauf der An-Zeit-Verteilungen bei kleinen Zeiten wird zunehmend (monoton) flacher, während die Verteilungen der Aus-Zeiten zunächst ebenfalls einem analogen Trend folgen, ab einer bestimmten und von der Feldfrequenz abhängenden Feldstärke jedoch wieder steiler verlaufen. Ein solcher Monotonie-Wechsel in der Blinkdynamik im Fall einer gleichbleibenden Variation einer äußeren Bedingung wurde bei Halbleiter-Nanokristallen so erstmalig beobachtet. Für Gleichfelder zeigen sich hingegen nahezu keine Auswirkungen. Lediglich die An-Zeit-Verteilungen sowie die Blinkfrequenz im Fall hoher Feldstärken werden modifiziert. Die Ergebnisse werden im Kontext verschiedener aktueller Modelle zur PL-Unterbrechung wie dem trapping-Modell, dem self-trapping-Mechanismus oder dem Modell multipler Rekombinationszentren diskutiert und diese entsprechend erweitert. Dabei stehen die dielektrischen Eigenschaften und die Relaxationsdynamik der lokalen Quantenpunkt-Umgebung im Mittelpunkt, deren Reaktion auf die externen Felder durch eine zeitabhängige Ausrichtung permanenter Dipole beschrieben werden kann.

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9

Kondo, Jorge Douglas Massayuki. "Estudo de colisões entre átomos de Rydberg ultrafrios em amostras atômicas aprisionadas numa armadilha óptica de dipolo." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-03022015-171234/.

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Neste trabalho, estudamos colisões entre átomos de Rydberg ultrafrios em uma amostra atômica de alta densidade aprisionada em uma armadilha óptica de dipolo (AOD) tipo QUEST (Quasi Electrostatic Trap). Nossos objetivos incluíam testar a manifestação de fenômenos de muitos corpos bem como estudar efeitos de anisotropia nos processos colisionais envolvendo dois corpos. Para isso, escolhemos o processo colisional descrito por 5/2+5/2(+2)3/2+(2)7/2 no intervalo de 37 ≤ ≤47. O processo foi estudado na ausência e presença de campo elétrico estático, originando as ressonâncias Förster. Os resultados mostram que mesmo em alta densidade atômica o processo de dois corpos domina a interação, apesar da clara manifestação do bloqueio dipolar. Após modificações na montagem experimental, estudamos um dos picos da ressonância Förster 375/2+375/2393/2+357/2 em função da direção e amplitude em relação ao eixo longitudinal da AOD. Discutimos os resultados e os desafios futuros do experimento.
In this paper, we study collisions between ultracold Rydberg atoms in a high density atomic sample trapped in an optical dipole trap (ODT), type QUEST (Quasi Electrostatic Trap). Our goals included testing the manifestation of many-body phenomena and to study anisotropy effects in collisional processes involving two Rydberg atoms. In order to do this, we have chosen the collision process described by 5/2+5/2(+2)3/2+(2)7/2 in the range of 37 ≤ ≤47. The process was studied in the presence and absence of a dc static electric field, also known as Förster resonances. The results show that even at high atomic density, two-body interaction dominates de process, despite the clear manifestation of Rydberg blockade. After several improvements in our experimental setup, we have studied also a Förster resonance peak 375/2+375/2393/2+357/2 as a function of the magnitude of the dc static electric field as well as the angle between this field and the longitudinal axis of the ODT. We discuss the results and future challenges of the experiment.

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10

Xiao, Hau-Yl, and 蕭豪毅. "Trapping Cold Atoms with an Optical Dipole Trap." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/14163296521974752188.

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Книги з теми "Dipole trapping"

1

Evans, D. R. Non-dipolar magnetic field models and patterns of radio emission: Uranus and Neptune compared : final report. [Washington, DC: National Aeronautics and Space Administration, 1994.

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2

United States. National Aeronautics and Space Administration., ed. Non-dipolar magnetic field models and patterns of radio emission: Uranus and Neptune compared : final report. [Washington, DC: National Aeronautics and Space Administration, 1994.

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3

United States. National Aeronautics and Space Administration., ed. Non-dipolar magnetic field models and patterns of radio emission: Uranus and Neptune compared : final report. [Washington, DC: National Aeronautics and Space Administration, 1994.

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4

Trenkwalder, Andreas. Design of a Resonator Dipole Trap: A Report About the Design of a Resonator Enhanced Optical Dipole Trap Aimed for Trapping a Mixture of Fermionic Species. VDM Verlag Dr. Mueller E.K., 2008.

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5

Wolf, E. L. More about the Atmosphere, Molecules, and their Interaction with Radiation. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198769804.003.0007.

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Electric dipole radiation is possible from certain molecules (but not with diatomics like oxygen and nitrogen) to make them active in intercepting and re-radiating electromagnetic waves in the atmosphere. Molecules of the greenhouse gas variety include carbon dioxide, ozone and water, as discussed in this chapter. Molecular contributions to the greenhouse heat-trapping effect are described, including sophisticated satellite measurements. The role of molecular absorption in altering the ground-level solar spectrum absorbed by solar farms is summarized. In this chapter we provide a molecular basis for the absorption and emission from the atmosphere, first discussed in Chapter 3. This gives a better understanding of the solar spectrum as seen on Earth, that feeds photovoltaic devices as well as heating the Earth’s surface, that in turn creates winds and waves that can be harvested.

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Частини книг з теми "Dipole trapping"

1

"Spinor Condensates in Optical Dipole Traps." In Optical Trapping and Manipulation of Neutral Particles Using Lasers, 291–93. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812774897_0018.

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2

"Trapping of Single Atoms in an Off-Resonance Optical Dipole Trap." In Optical Trapping and Manipulation of Neutral Particles Using Lasers, 333–36. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812774897_0022.

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3

Shimoda, Koichi. "Trapping and Cooling of Neutral Atoms with the Dipole Force of a Laser Beam." In Laser Spectroscopy, 16–19. Elsevier, 1989. http://dx.doi.org/10.1016/b978-0-12-251930-7.50009-1.

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4

"Relationships Among Ferroelectric Fatigue, Electronic Charge Trapping, Defect-Dipoles, and Oxygen Vacancies in Perovskite Oxides." In Science and Technology of Integrated Ferroelectrics, 519–28. CRC Press, 2001. http://dx.doi.org/10.1201/9781482283365-46.

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5

Raspertova, Ilona, and Rostyslav Lampeka. "NITRONE AS LIGANDS: STRUCTURE, PROPERTIES AND FUNCTIONALITY." In Development of scientific, technological and innovation space in Ukraine and EU countries. Publishing House “Baltija Publishing”, 2021. http://dx.doi.org/10.30525/978-9934-26-151-0-36.

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This paper aims to analyze and systematize aspects of coordination chemistry of nitrones and the field of application of coordination compounds based of nitrones. Nitrones as a class of organic compounds have been known for a long time. They are used in organic synthesis as starting materials for acyclic compounds and as «spin trapping agents» for studying various processes in biological systems. A significant amount of nitrone derivatives has pharmacological activity and is a part of some drugs. The high electron density on the oxygen atom of the nitronе group promotes the formation of coordination compounds. This property of nitrones is widely used to influence their reactivity. Nitrones can also be potential corrosion inhibitors due to their ability to form stable complexes. But the coordination chemistry of this class of compounds remains poorly studied. The literature describes coordination compounds of metals with aliphatic, six-membered aromatic and some heterocyclic compounds. Analysis of the literature showed that nitronе-based coordination compounds attract considerable attention with their useful properties, in particular: they can affect the passage of 1,3-dipolar cycloaddition reactions, act as catalysts in Heck, Kumada and ketone hydrogenation reactions, show antitumor activity against HepG2 cells. The wide range of applications of coordination compounds of nitrones and their small number indicate the ability to generate a significant number of new compounds with new properties.

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Тези доповідей конференцій з теми "Dipole trapping"

1

Watts, Molly, Gadi Afek, Sarah Dickson, Fernando Monteiro, Luke Mozarsky, Juan Recoaro, Benjamin Siegel, Yu-Han Tseng, Jiaxiang Wang, and David C. Moore. "Controlling electric dipole moments in levitated optomechanics." In Optical Trapping and Optical Micromanipulation XIX, edited by Kishan Dholakia and Gabriel C. Spalding. SPIE, 2022. http://dx.doi.org/10.1117/12.2634071.

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2

Bradac, C., M. L. Juan, B. Besga, G. Molina-Terriza, and T. Volz. "Observation of Atomic Dipole Forces in Optically Trapped Nanodiamonds Containing NV Centres, in a Liquid Environment." In Optical Trapping Applications. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/ota.2015.ott1d.6.

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3

Antipov, Sergey, and Sergei Nagaitsev. "Electron cloud trapping in combined function dipole magnets." In 38th International Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.282.0773.

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4

Zhang, Weihua, and Olivier J. F. Martin. "Optical trapping and sensing with plasmonic dipole antennas." In SPIE NanoScience + Engineering, edited by Mark I. Stockman. SPIE, 2010. http://dx.doi.org/10.1117/12.864225.

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5

Chu, Steven. "Laser cooling and trapping." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.tujj1.

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The purpose of this tutorial is to introduce the listener to the rapidly developing field of laser cooling and trapping. Doppler cooling is first discussed followed by the new mechanism of cooling based on ground-state energy level shifts in light fields with polarization gradients. Next, the basic concepts of magnetic traps, optical dipole force traps (optical tweezers), and the magnetooptic trap are considered. Selected uses of these traps and cooling techniques are given to elucidate the broad utility of these techniques.

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6

Lee, Heun-Jin, Charles Adams, Nir Davidson, Brent Young, Martin Weitz, Mark Kasevich, Steven Chu, D. J. Wineland, C. E. Wieman, and S. J. Smith. "Dipole Trapping, Cooling in Traps, and Long Coherence Times." In ATOMIC PHYSICS 14: Fourteenth International Conference on Atomic Physics. AIP, 1994. http://dx.doi.org/10.1063/1.2946010.

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7

Brandt, L., C. Muldoon, E. Brainis, and A. Kuhn. "Towards a scalable dipole-trapping scheme for neutral atoms." In 2008 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2008. http://dx.doi.org/10.1109/cleo.2008.4551977.

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8

Gould, P. L., A. L. Migdall, H. J. Metcalf, and W. D. Phillips. "Dipole laser trap for neutral atoms." In International Laser Science Conference. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.wf3.

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We describe a relatively large volume dipole laser trap for the confinement of sodium atoms. Two counterpropagating beams, tuned below resonance, with foci separated by approximately one con focal parameter, provide radial confinement via the dipole force and axial confinement by balancing the radiation pressures of the two beams.1 Identical circular polarization for both beams prevents optical pumping and serves to maintain a two-state system. Alternation of the two beams2 is necessary to avoid the effects of standing-wave heating. Additionally, the trapping cycle is alternated with a Doppler cooling cycle2 to achieve low temperatures and long confinement times. Trapping beams of 100 mW focused to 50-μm spot radii and detuned ~2 GHz below the F = 2 to F′= 3 transition of the D2 line provide a well depth of 50 mK and a confinement volume of 10-4 cm3. Analysis of atomic motion and escape mechanisms as well as progress toward the experimental realization of this trap is presented.

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García, Luis D., Lawrence C. Cheung, James C. Mikkelsen, Juan G. Santiago, Anthony F. Bernhardt, and Vincent Malba. "A Sub-Millimeter Solenoid Device for Trapping Paramagnetic Microbeads." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/mems-23880.

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Abstract We present the design and preliminary evaluation of a paramagnetic microsphere trapping and separation device consisting of a copper solenoid wrapped around a 1.3 mm diameter glass capillary. The magnetization and subsequent dipole-dipole interaction of paramagnetic spheres under an applied magnetic field results in the formation of bead chains that persist and grow under the applied field, but quickly disperse upon field removal. The chaining of paramagnetic spheres is important to the design of magnetic-based separation devices because the viscous-drag-limited velocities of chains are typically several times larger than that of individual particles. We have performed a set of experiments designed to evaluate the performance of a sub-millimeter solenoid device including measurements of the temperature versus field strength of the device, observations of the controlled chain formation process, and preliminary observations regarding the maximum flow rate over which the bead chains can be held in place by magnetic forces. These results are applicable to the design and characterization of magnetically induced microsphere trapping and separation systems which use pressure driven flow.

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10

Scielzo, N. D. "Progress Towards Laser Trapping of 225Ra for an Electric Dipole Moment Measurement." In PARTICLES AND NUCLEI: Seventeenth Internatinal Conference on Particles and Nuclei. AIP, 2006. http://dx.doi.org/10.1063/1.2220382.

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