Bulletin of the American Physical Society
2021 Annual Meeting of the APS Four Corners Section
Volume 66, Number 11
Friday–Saturday, October 8–9, 2021; Virtual; Mountain Daylight Time
Session J04: AMO and Quantum Information III |
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Chair: T.-C. Shen, Utah State University |
Saturday, October 9, 2021 10:45AM - 11:09AM |
J04.00001: Attosecond all-optical light field sampling. Invited Speaker: Mohammed Hassan The light field sampling is crucial in attosecond time-resolved spectroscopic measurements. The sampling of a light field ---triggers the ultrafast dynamics in time-resolved spectroscopic measurements---allows for a direct connection between the driver field and the measured dynamics trace as it evolves in time. Currently, the available light field metrology approaches (i.e., attosecond streaking and Attoclock) are based on the generation of the attosecond XUV pulses. These methodologies require a fully equipped XUV beamline included the generation of XUV pulses by High Harmonic Generation (HHG), attosecond XUV pulse isolation, and a sophisticated and complex laser pump-XUV probe setup. Such a beamline is costly and technically complicated. Hence, the ultrafast research field calls for a new direct and simple approach for light field characterization. Here, we exploited this light field-driven electronic response and the related reflectivity modulation in dielectric to demonstrate an all-optical light field sampling methodology with attosecond resolution. This approach can be used under any experimental conditions, thus enabling the direct connection between the sub-femtosecond triggering field and the measured dynamics in potential time-resolved measurements, providing more insight into the physics of ultrafast dynamics in matter. Also, this simple field sampling metrology promises a profound advancement in ultrafast and attosecond science fields. [Preview Abstract] |
Saturday, October 9, 2021 11:09AM - 11:21AM |
J04.00002: Macroscopic High Harmonic Generation with Gouy and Gaussian Phase Distributions Bejan Ghomashi, Ran Reiff, Andreas Becker We study the effects of the Gouy and Gaussian phase distributions on phase matching in macroscopic high harmonic generation (HHG) for different locations of a gas jet with respect to the focus of a laser pulse. The macroscopic HHG signal is computed by first interpolating results of \emph{ab initio} simulations of the time-dependent Schrodinger equation at the microscopic level over both intensity and carrier envelope phase. Then, we approximate the macroscopic build-up assuming point-like field emitters. We develop several measures to qualitatively discuss the strength and width of the harmonic line and the relevance of off-harmonic radiation. [Preview Abstract] |
Saturday, October 9, 2021 11:21AM - 11:33AM |
J04.00003: Imaging interfacial thermal transport of WSe2/SiO2 via ultrafast infrared nano-thermometry Peter A. Chabal, Samuel C. Johnson, Shiqian Hu, Jun Nishida, Baowen Li, Markus B. Raschke Interfacial energy transport is of high importance in technological advances, e.g., semiconducting nanoelectronics, 2D material nanocomposites, and energy transmission and conservation devices. For materials of little spectral overlap and length scales smaller than the phonon mean path, like semiconductors on silicon with a thermal oxide, the energy transfer resistance is dominated by the interface. However, these fundamental interfacial processes are poorly understood due to limitations of conventional spectroscopy techniques by spatial resolution, interfacial sensitivity, or ultrafast temporal resolution. Here, we implement ultrafast $s$-SNOM, with its evanescent signal spatially confined to the nanoscale to resolve ultrafast dynamics at the interface that is discriminated from the conventionally bulk dominated response. We perform pump modulated pump-probe nano-spectroscopy and -imaging, for a monolayer to bulk transition metal dichalcogenide (TMD) on SiO2, resolving thermal dynamics on the 10 ps timescale through substrate phonon softening to measure interfacial transport. We supplement this with molecular dynamic simulations to quantify relationships between maximum temperature, TMD layer number, and thermal boundary conductance (TBC). The interfacial phonon scattering at high temperatures and the finite size effects of monolayer WSe2 both limit the thermal conductivity in relation to bulk WSe2. This approach can be applied to optimize interfacial thermal management. [Preview Abstract] |
Saturday, October 9, 2021 11:33AM - 11:45AM |
J04.00004: Scattering of light from periodic conducting structures Wesley Mills, Christian Lange, T.-C. Shen Light scattered from periodic structures generates numerous fascinating phenomena from the diffraction patterns to the black patches on some butterfly wings. The simple scalar wave formulation based on Huygens principle can account for many diffraction and radiation patterns at far field. However, when the structure dimensions are smaller than the wavelength, light polarization and structure details become important, the vector formulation based on Maxwell's equations is necessary. We will present an analytic calculation and a numerical simulation on light scattering from two-dimensional conducting grids to model the reflectance from butterfly wings and broadband absorption structures made from carbon nanotube forests. [Preview Abstract] |
Saturday, October 9, 2021 11:45AM - 11:57AM |
J04.00005: Recent Progress in Imaging of Barium Atoms in Solid Xenon Mari Todd, David Fairbank, Jennifer Stanley, William Fairbank Interest in neutrinoless double beta decay searches has increased in recent decades to probe whether the neutrino is its own anti-particle or not. Recent searches in enriched liquid Xenon have occurred in the EXO-200 experiment, with plans to achieve greater sensitivity in a ton-scale detector in the nEXO experiment. In liquid 136Xe, double beta decay leaves behind a daughter barium atom. If this daughter can be identified and tagged, the only remaining background in the detector will be 2$\nu \beta \beta $ decay. To this end, images of single barium atoms in solid xenon in one matrix site have been achieved. [1]. Imaging of single Ba atoms in the other three matrix sites is more challenging due to greater photobleaching that limits the number of photons emitted by one atom. Recent evidence of fluorescence recovery from photobleaching upon annealing and reduced photobleaching at higher temperature show promise for improved single Ba atom imaging in these matrix sites. [1] Chambers et al. Nature [Preview Abstract] |
Saturday, October 9, 2021 11:57AM - 12:09PM |
J04.00006: Sample Preparation for Lensless Strain Imaging at Twin Grain Boundaries Landon Schnebly, Richard Sandberg, McKayla Townsend, Hyrum Taylor, Naomi Jensen, Nick Porter, Matt Wilkin, Anastasios Pateras, Anthony Rollett, Yueheng Zhang, Ross Harder, Wonsuk Cha, Barbara Frosik We seek to use Bragg coherent diffraction imaging (BCDI) to study how metals begin to damage at the nanometer scale. BCDI has previously been shown to have near wavelength-limited resolution. We use BCDI data from coherent x-rays scattered from crystalline metal samples at Argonne National Laboratory's Advanced Photon Source. We then use a program, Cohere, to create 3D strain maps of single metal grains during past beam times. We wish to eventually develop a method allowing joint reconstruction of multiple Bragg peaks. This would allow us to better study how defects in a polycrystalline metal are transmitted through a grain boundary under strain. The constraints necessary for 3D complex image retrieval via an iterative phase-retrieval technique will be explained with the aid of computer simulations utilizing fast Fourier transforms. Because a priori information results in more quickly converging iterative solution, twin grain boundaries were identified as prime sites for testing our technique. To identify samples with the necessary properties, we used scanning electron microscopy. The analysis and preparation of samples for our beamline experiments will be discussed. [Preview Abstract] |
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