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Search Publications by: Jabez J McClelland (Fed)

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Displaying 51 - 75 of 144

Sub-Doppler Laser Cooling and Magnetic Trapping of Erbium

November 27, 2007
Author(s)
Andrew J. Berglund, Simone Lee, Jabez J. McClelland
We investigate cooling mechanisms in magneto-optically and magnetically trapped erbium. We find efficient sub-Doppler cooling in our trap, which can persist even in large magnetic fields due to the near degeneracy of two Lande g factors. Furthermore, a

Laser Cooled Atoms as a Focused Ion Beam Source

December 21, 2006
Author(s)
James L. Hanssen, Jabez J. McClelland, E Dakin, M Jacka
The evolving field of nanofabrication demands that more precise fabrication and evaluation tools be developed. We describe a method for creating a high quality focused ion beam with enhanced capabilities using an ion source based on laser-cooled neutral

Using Laser-Cooled Atoms as a Focused Ion Beam Source

December 1, 2006
Author(s)
James L. Hanssen, E Dakin, Jabez J. McClelland, M Jacka
The authors describe a new method for creating a high quality focused ion beam using laser-cooled neutral atoms in a magneto-optical trap as an ion source. They show that this new technique can provide spot resolutions and brightness values that are better

Natural Linewidth of the 401-nm Laser-Cooling Transition in Er I

June 20, 2006
Author(s)
Jabez J. McClelland
A measurement of the natural linewidth of the 401 nm 4f 126s 2 ( 3H 6) {rarr} 4f 12( 3H)6s6p ( 1P o 1) (6,1) 7 o transition in Er I is presented. Using laser-induced fluorescence in an atomic beam, a linewidth of (36.0 {plus or minus} 1.2) MHz is observed

Laser Cooling Without Repumping: A Magneto-Optical Trap for Erbium Atoms

April 14, 2006
Author(s)
Jabez J. McClelland, James L. Hanssen
We report on a novel mechanism that allows for laser cooling of atoms that do not have a closed cycling transition. This mechanism is observed in a magneto-optical trap for erbium, an atom with a very complex energy level structure with multiple pathways

Laser Cooling of Erbium Atoms

May 21, 2005
Author(s)
Jabez J. McClelland, H Y. Ban, Marcus Jacka, James L. Hanssen, Joseph Reader
We have identified five closed, or nearly-closed, J ? J + 1 transitions in atomic erbium at wavelengths of 401 nm, 583 nm, 631 nm, 841 nm, and 1299 nm. These transitions can be reached by common tunable single-frequency laser systems, and are thus in

Laser Cooling Transitions in Atomic Erbium

April 18, 2005
Author(s)
H Ban, M Jacka, James L. Hanssen, Joseph Reader, Jabez J. McClelland
We discuss laser cooling opportunities in atomic erbium, identifying five J rarr} J + 1 transitions from the 4f 126s 2 3H 6 ground state that are accessible to common visible and near-infrared continuous-wave tunable lasers. We present lifetime

Nanotechnology with Atom Optics

November 1, 2004
Author(s)
Jabez J. McClelland, Shannon B. Hill, M Pichler, Robert Celotta
A brief review of atom optics is presented, with emphasis on how it can be applied in the field of nanotechnology. Two specific examples are discussed: laser-focused atomic deposition and deterministic production of single atoms. Results are summarized for

A chromium surface magneto-optical trap for magnetic microtrap studies

May 1, 2004
Author(s)
M Pichler, S Hill, Jabez J. McClelland
A surface magneto-optical trap for chromium atoms is demonstrated as a first step toward loading atoms into microscopic magnetic traps. Characteristics of the trap and transfer to microscopic magnetic traps will be discussed.

A Fast, Deterministic Source of Single Cr Atoms

June 1, 2003
Author(s)
Jabez J. McClelland, Shannon B. Hill
We produce single Cr atoms on demand by feedback control of loading and loss from a magneto-optical trap. We observe single-atom occupation probabilities of over 98% and efficient ejection at rates up to 10 Hz.

Atoms on Demand: Fast, Deterministic Production of Single Cr Atoms

May 5, 2003
Author(s)
S Hill, Jabez J. McClelland
We have realized a method for producing single Cr atoms on demand by suppressing the stochastic nature of the loading and loss processes of a magneto-optic trap. We observe single-atom trap occupation probabilities as high as (98.7 plus or minus} 0.1)% and

Accuracy of Nanoscale Pitch Standards Fabricated by Laser-Focused Atomic Deposition

March 1, 2003
Author(s)
Jabez J. McClelland, W Anderson, C Bradley, M Walkiewicz, R Deslattes, E Jurdik, Robert Celotta
The pitch accuracy of a grating formed by laser-focused atomic deposition is evaluated from the point of view of fabricating nanoscale pitch standard artifacts. The average pitch obtained by the process, nominally half the laser wavelength, is simply

Laser-Focused Nanofabrication: Beating of Two Atomic Resonances

June 10, 2002
Author(s)
E Jurdik, K van, J Hohlfeld, T Rasing, Jabez J. McClelland
We deposit a laser-collimated chromium beam onto a substrate through a laser standing-wave (SW) tuned above the atomic resonance at either of the two 52Cr transitions 7S 3rarr} 7P° 3 at 427.600 nm or 7S 3rarr} 7P° 4 at 425.553 nm. In both these cases the

Laser-Focused Atomic Deposition - Nanofabrication via Atom Optics

May 15, 2000
Author(s)
Jabez J. McClelland, Robert Celotta
In conventional molecular-beam epitaxy, atoms from a diffuse source randomly impinge upon a surface, accumulating in atomic layers or islands. We have recently demonstrated an enhancement of this process, in which the trajectories of the atoms are

Magneto-Optical Trapping of Chromium Atoms

May 1, 2000
Author(s)
C Bradley, Jabez J. McClelland, W Anderson, Robert Celotta
We have constructed a magneto-optical trap for chromium atoms. Using trapping light at 425 nm and two repumping lasers tuned to intercombination transitions, over 10 6 atoms were trapped and average densities of over 10 16 m -3 were obtained. Non

Nanofabrication via Atom Optics

January 1, 2000
Author(s)
Jabez J. McClelland
A review is given of the field of nanofabrication via atom optics. Discussion is presented of the fundamentals of atom manipulation and atom optics, with emphasis on the aspects that are, or might be, useful for nanofabrication. The current status of

Surface Growth in Laser-Focused Atomic Deposition

July 15, 1999
Author(s)
E Jurdik, T Rasing, K van, C Bradley, Jabez J. McClelland
We present calculations of surface growth in laser-focused nanostructure fabrication. We show that theoretical predictions of the structure profile s shape depend sensitively on the model used to describe the growth, and also on the parameters chosen

Patterning of Octadecylsiloxane Self-assembled Monolayers on Si(100) using Ar( 3 P 0 ,2) Atoms

May 1, 1999
Author(s)
Shannon B. Hill, C Haich, F Dunning, G Walters, Jabez J. McClelland, Robert Celotta, H Craighead, J Han, D Tannenbaum
We report the use of metastable (Ar 3P 0,2) atoms and a physical mask to pattern octadecylsiloxane self-assembled monolayers grown directly onsilicon surfaces. The damage to the monolayer is confirmed using lateral force microscopy, changes in

Patterning of Hydrogen-Passivated Si(100) using Ar( 3 P 0,2 ) Metastable Atoms

April 12, 1999
Author(s)
S Hill, C Haich, F Dunning, G Walters, Jabez J. McClelland, Robert Celotta, H Craighead
Patterning of silicon by exposing a hydrogen-passivated Si(100) surface to Ar( 3P 0,2) metastable atoms through a fine grid in the presence of a small backgroundpressure of oxygen is described. Metastable atom impact leads to the formation of a uniform

Minimizing Feature Width in Atom-Optically Fabricated Chromium Nanostructures

March 1, 1999
Author(s)
W Anderson, C Bradley, Jabez J. McClelland, Robert Celotta
We present a study of factors that influence the feature width of nanostructures formed by atom-optical direct-write lithography. In this process, chromium atoms travel through a standing-wave laser light field and are deposited on a surface. Due to the

Nanofabrication via Atom Optics

February 23, 1999
Author(s)
C Bradley, W Anderson, Jabez J. McClelland, Robert Celotta
Owing to the continuing reduction in the scale of microelectronic and micromagnetic technology, new microfabrication methods are constantly being explored. This is particularly true in the case of nanostructure fabrication. Here, the phenomenon of optical

Fabrication and Domain Imaging of Iron Magnetic Nanowire Arrays

May 1, 1998
Author(s)
D Tulchinsky, Michael H. Kelley, Jabez J. McClelland, R Gupta, Robert Celotta
Arrays of magnetic nanowires are fabricated by using a corrugated surface, produced by chromium atoms laser-focused in a one-dimensional standing wave, as a shadow mask for an iron evaporator. The deposited iron forms a periodic array consisting of
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