Bulletin of the American Physical Society
13th Annual Meeting of the Northwest Section of the APS
Volume 56, Number 10
Thursday–Saturday, October 20–22, 2011; Corvallis, Oregon
Session C3: Atomic, Molecular and Optical Physics |
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Chair: Barry Sanders, University of Calgary, and Shannon Mayer, University of Portland Room: LaSells Stewart Center Agriculture Science Room |
Friday, October 21, 2011 1:30PM - 2:06PM |
C3.00001: Towards ultracold RbCa molecules Invited Speaker: Ultracold heteronuclear molecules have received much attention lately because of their potential applications in high-precision spectroscopy, studies of fundamental symmetries and quantum information processing. So far the focus has been on alkaline/alkaline dimers since their constituent atoms have been studied extensively. Recently, several groups have begun work on more challenging alkaline/alkaline-earth or alkaline/rare-earth combinations. In addition to a permanent electric dipole moment, which makes the alkaline/alkaline dimers such an intriguing system, alkaline/alkaline-earth molecules also possess a permanent magnetic dipole moment, thus allowing the manipulation with electric and magnetic fields. In addition, the molecular ground state of an alkaline/alkaline-earth dimer has a non-vanishing spin. Interesting collision dynamics, for example the suppression of collisions in carefully tailored external fields, have been predicted. At Willamette University, we will trap ultracold gases of rubidium and calcium together to form the molecular dimer RbCa via photoassociation of the constituent atoms. In this talk we will discuss the current state of the experiment and our future plans.\\[4pt] In collaboration with Hayley Whitson, Garrett Potter, and Kristen Norton, Willamette University. [Preview Abstract] |
Friday, October 21, 2011 2:06PM - 2:42PM |
C3.00002: Diamond Nanophotonics and Quantum Optics Invited Speaker: The diamond nitrogen-vacancy (NV) center is an optically active impurity whose ``atom-like'' properties make it a promising solid state qubit, in which well-defined optical transitions are used to control the quantum state of single NV electron and nuclear spins. These properties have led to impressive demonstrations of quantum information storage in single NV nuclear spins, entanglement between NV electron spins and single photons, and implementations of high resolution optical magnetometers using single NVs. A missing ingredient for implementing quantum information processing architectures with NVs is creating scalable coherent coupling between them. Nanophotonic circuits, in which waveguides function as a ``quantum bus'' between NVs embedded in optical microcavities, offer a chip-based solution to this hurdle. In my talk I will review recent advances in realizing nanophotonic devices in diamond based materials. I will present results demonstrating Purcell enhanced coupling between optical nanocavities and NVs in single crystal diamond, and will discuss opportunities and challenges which lay ahead for diamond quantum optics. [Preview Abstract] |
Friday, October 21, 2011 2:42PM - 2:54PM |
C3.00003: Terahertz Spectroscopy of Ni-Ti Alloy Thin Films Michael Paul, Andy Jameson, Joe Tomaino, Josh Kevek, Meghan Hemphill Johnston, Justin Ong, Milo Koretsky, Ethan Minot, Yun-Shik Lee We investigate the carrier dynamics in nickel-titanium (Ni-Ti) alloy thin films using THz transmission spectroscopy. Ni-Ti alloys have peculiar mechanical properties, in particular, shape memory effects. Electrical conductivity can be a good measure to characterize the phase transitions. We fabricated 60$\sim $80-nm Ni-Ti alloy films of various Ti concentrations (0-100{\%}). The films were deposited on Si substrates by Ar plasma sputtering. Analyzing the relative power transmission and transmitted waveforms, we obtained the alloy film resistivity of several different Ti concentrations. DC resistivity measurements were made via 4-point probe for comparison. Results show sharp changes in resistivity near the Ti fractions of 22{\%}, 44{\%}, and 62{\%} by weight. Previous studies of the Ni-Ti system have shown that the alloy undergoes a phase transition at each of these compositions. [Preview Abstract] |
Friday, October 21, 2011 2:54PM - 3:06PM |
C3.00004: Terahertz imaging and spectroscopy of large area single-layer graphene Joe Tomaino, Andy Jameson, Josh Kevek, Michael Paul, A.M. van der Zande, R.A. Barton, P.L. McEuen, Ethan Minot, Yun-Shik Lee We demonstrate terahertz (THz) imaging and spectroscopy of a 15x15-mm square single-layer graphene film on Si using broadband THz pulses. The THz images clearly map out the THz carrier dynamics of the graphene-on-Si sample, allowing us to measure sheet conductivity with sub-mm resolution without fabricating electrodes. The THz carrier dynamics are dominated by intraband transitions and the THz-induced electron motion is characterized by a flat spectral response. A theoretical analysis based on the Fresnel coefficients for a metallic thin film shows that the local sheet conductivity varies across the sample from 1.7e-3 to 2.4e-3 inverse ohms. [Preview Abstract] |
Friday, October 21, 2011 3:06PM - 3:18PM |
C3.00005: Viewing the Northwest Coast and Lakes from Space: HICO and MERIS 2011 Nicholas Tufillaro Northwest surface water quality --- lakes, reservoir, and the coastal ocean --- are observed with two imaging spectrometers in earth orbit. The first is MERIS, a filter spectrometer with 15 bands in the visible and near-IR, and a 30 meter ground pixel size. The second is HICO, and experimental grating spectrometer on the international space station with approximately 100 spectral bands and ground pixel size of 100 meters. We examine Northwest waters in an effort to estimate water quality parameters such as sediment loads and transport, and algal concentrations. In particular, we illustrate how remote sensing, and site specific in-situ measurements, can be combined to build simple detectors for events like harmful algal blooms. Come see beautiful pictures and spectra of the Klamath lake, Crater lake, and the Columbia river from 2011. [Preview Abstract] |
Friday, October 21, 2011 3:18PM - 3:30PM |
C3.00006: Parameter identification from scalar time series generated by a chaotic Malkus-Lorenz water wheel Lucas Illing We show how a simple experimental implementation of the Malkus-Lorenz water wheel exhibits both chaotic and periodic behavior in agreement with predictions from the Lorenz model. We then use the angular velocity data of the wheel to address the general problem of how to estimate unknown model-parameters from scalar outputs of chaotic systems. We discuss and compare two estimators: one is based on a novel globally convergent adaptive observer, the second is an extended Kalman filter. [Preview Abstract] |
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