Bulletin of the American Physical Society
Joint Fall 2010 Meeting of the Texas Sections of the APS, AAPT, Zone 13 of SPS and the National Society of Hispanic Physicists
Volume 55, Number 11
Thursday–Saturday, October 21–23, 2010; San Antonio, Texas
Session FA1: Atomic, Molecular, and Optical Physics II |
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Chair: Andrey Chabanov, University of Texas at San Antonio Room: University Center III Travis Room, 2nd floor |
Friday, October 22, 2010 3:00PM - 3:12PM |
FA1.00001: Whispering-Gallery Modes in Quantum Dot-Embedded Microspheres Hope Beier, Kenith Meissner Optical resonances, known as Whispering Gallery Modes (WGMs), from quantum dot embedded polystyrene microspheres offer potential for remote detection of molecules adsorbed onto or bound to the microsphere surface. The total internal reflection of the quantum dot (QD) emission light within the high index polystyrene microsphere produce narrow spectral peaks that shift position with variations in the local refractive index sampled by the evanescent tail of the WGMs. QD-embedded microsphere response has demonstrated increased sensitivity over theoretical predictions for a homogeneous microsphere. By considering the embedded QDs as a high index outer layer, the positions, Q-factor, and sensitivity of the WGMs were modeled. This model, along with estimates of the QD-layer index and penetration depth, was used to relate the locations and sensitivities of the modes to our experimental results with strong agreement between the two. [Preview Abstract] |
Friday, October 22, 2010 3:12PM - 3:24PM |
FA1.00002: Experimental and Numerical Studies of Thermal Lensing in Optical Materials Samantha Franklin A common issue found in near-IR laser applications with multi kW beams is thermo-optical effects due to small levels of absorption of the optical material used in the beam train elements. To validate current beam propagation codes for this application, a closed-aperture Z-scan experiment was performed. Commercially available NG11 and NG4 (Schott glass) absorptive neutral density filters were used as the sample with optical densities ranging from 0.1-0.5. They were exposed with a 532 nm beam at 100mW power for 1 s at different z-positions in the optical path. The experimental parameters were entered into the computer model and the irradiance vs. position (in meters) of the computer model output data was compared to the graph of normalized irradiance vs. z-position (in meters) of the Z-scan experiment. Experimentally measured values were compared to calculations from the laser propagation model; the results of this comparison showed that the modeling program is a proper measuring tool in the outcome of a thermal lensing experiment. Public Release Code: AFRL-RH-AB-2010-0043 PA{\#} 10-350 [Preview Abstract] |
Friday, October 22, 2010 3:24PM - 3:36PM |
FA1.00003: Controllable optical switch by a Bose-Einstein condensate in an optical cavity Shuai Yang, Mohammad Al-Amri, Jorg Evers, M. Suhail Zubairy The optical bistability of the combination of the optical cavities and ultra cold atomic ensembles is investigated. We find that the transverse pumping field can be used to control the bistable behavior of the intra cavity photons induced by the input pumping along the cavity axis. This phenomenon can be used as a controllable optical switch. [Preview Abstract] |
Friday, October 22, 2010 3:36PM - 3:48PM |
FA1.00004: High Energy Scattering from all Isotopormers of H2 Steven Alexander, R.L. Coldwell Using variational Monte Carlo and simple, explicitly-correlated fully-nonadiabatic wavefunctions for the lowest rovibrational state of all the H2 isotopomers, we have computed cross sections for the elastic and inelastic scattering of fast electrons and X-rays. Our results are in good agreement with the calculations of Kolos, Monkhorst and Szalewicz (J. Chem. Phys. 77, 1323 (1982)). [Preview Abstract] |
Friday, October 22, 2010 3:48PM - 4:00PM |
FA1.00005: Optimizing coherent anti-Stokes Raman scattering by genetic algorithm controlled pulse shaping Wenlong Yang, Alexei Sokolov The hybrid coherent anti-Stokes Raman scattering (CARS) has been successful applied to fast chemical sensitive detections. As the development of femto-second pulse shaping techniques, it is of great interest to find the optimum pulse shapes for CARS. The optimum pulse shapes should minimize the non-resonant four wave mixing (NRFWM) background and maximize the CARS signal. A genetic algorithm (GA) is developed to make a heuristic searching for optimized pulse shapes, which give the best signal the background ratio. The GA is shown to be able to rediscover the hybrid CARS scheme and find optimized pulse shapes for customized applications by itself. [Preview Abstract] |
Friday, October 22, 2010 4:00PM - 4:12PM |
FA1.00006: Surface Plasmon Polariton Propagation, Interference and Diffraction Jacob Ajimo, Charles Reagan, Ayrton Bernussi, Luis Grave de Peralta Interest in plasmonics calls for in depth characterization of surface plasmon polaritons. We present a series of experiments done to investigate the propagation, interference and diffraction of surface plasmon polaritons. Leakage radiation microscopy was used to image the in plane propagation of surface plasmon polaritons resulting in demonstration of a plasmonic quantum eraser. Fundamental aspects on the propagation of the SPPs based on experimental results will be presented. Experimental and simulation results on the use of dielectric loaded surface plasmon polariton waveguides will be discussed. [Preview Abstract] |
Friday, October 22, 2010 4:12PM - 4:24PM |
FA1.00007: Carrier-Envelope Phase Effects in Multi-Photon Procesess Pankaj Jha, Yuri Rostovtsev, Hebin Li, Vladimir Sautenkov, Marlan Scully We present an experimental and theoretical study of the carrier- envelope phase (CEP) effects in multi-photon excitation process between two bound atomic states interacting with intense pulses consisting of many cycles (up to 15 cycles) of the field. Radio frequency pulses with Rabi frequency of the order of the atomic transition frequency are used to transfer population among the ground state hyperfine levels in rubidium atoms. We have found that, for long pulses consisting two frequencies, the CEP of the pulses strongly affects that transfer. Extending the CEP control to longer pulses creates interesting possibilities to generate pulses with accuracy that is better than a period of laser oscillation. [Preview Abstract] |
Friday, October 22, 2010 4:24PM - 4:36PM |
FA1.00008: Speckle Statistics of Localized Waves in Random Media Abe Pena, Andrey Chabanov, Jing Wang, Azriel Genack The onset of single-channel transport in multi-channel disordered systems due to Anderson localization is observed in speckle pattern statistics. These statistics have been gathered with microwave radiation transmitted through an ensemble of quasi-1D random dielectric samples of length two times the localization length. In a single-channel regime, the transmission speckle pattern exhibits a ``perfect memory'' effect: A shift in the direction and/or polarization of the incoming wave leaves nearly unchanged the positions and relative brightness's of speckles, while leading to large fluctuations of total transmission. The probability distribution of single-channel microwave transmittance (conductance) as determined from the measurements of speckle intensity statistics is compared to those predicted for localized waves. [Preview Abstract] |
Friday, October 22, 2010 4:36PM - 4:48PM |
FA1.00009: Coherent control of Casimir force in chiral medium Jabir Hakami, Qingqing Sun, Suhail Zubairy Chirality has been previously reported as a way to obtain repulsive Casimir forces [PRL 103, 103602 (2009)]. Here we propose the coherent control of the Casimir force between two identical atomic chiral media. We apply a magnetic field to split the detuning as well as the refractive indexes for the two circular polarizations, which leads to chirality. Changing the strength of this magnetic field gives us different Casimir forces, and possibly a switch between attractive and repulsive forces. [Preview Abstract] |
Friday, October 22, 2010 4:48PM - 5:00PM |
FA1.00010: Spectroscopic Ellipsometry of Gadolinium Gallium Oxide thin films Kaleb Gilbert, Kunal Bhatnagar, Steve Jackson, Ravindranath Droopad, Wilhelmus Geerts, Toni Sauncy The dielectric parameters of Gadolinium Gallium Oxide (GGO) multilayer structures have been investigated with spectroscopic ellipsometry and modeled with a simplified modeling technique. The GGO thin films are of varying thickness and the simple four parameter model was effective in determining consistent values for the dielectric constants of this important high k dielectric material. Ellipsometric data was collected in a specific acquisition configuration related to the tilt of the elliptically polarized light upon reflection from the GGO sample. The model is further confirmed by the determination of film thickness values within an acceptable range when compared with those reported by the sample grower. [Preview Abstract] |
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