Bulletin of the American Physical Society
2019 Annual Meeting of the APS Four Corners Section
Volume 64, Number 16
Friday–Saturday, October 11–12, 2019; Prescott, Arizona
Session B03: Atomic, Molecular, and Optical Physics I |
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Chair: Dylan Yost, Colorado State University Room: AC1 115 |
Friday, October 11, 2019 10:30AM - 10:54AM |
B03.00001: Using Machine Learning to Design Integrated Photonics Circuits Invited Speaker: Ryan Camacho In this talk I will describe some novel machine learning techniques for designing optical devices and circuits. As an example, I will show an artificial neural network (ANN) design framework for devices that can be used as building blocks in integrated photonic circuits. Once trained, the ANNs decrease the computational cost relative to traditional design methodologies by more than 4 orders of magnitude. To illustrate the power of our new design paradigm, I will present forward and inverse design tools enabled by the ANN and demonstrate parameter extraction from fabricated devices. [Preview Abstract] |
Friday, October 11, 2019 10:54AM - 11:06AM |
B03.00002: Etaloning Laser Interference Analysis Spectrometry (ELIAS) J. Nicholas Porter, Jarom Jackson, Dallin Durfee We have developed a robust, inexpensive wavelength meter that passes monochromatic, collimated light through a series of etalon-like structures, collects the resulting interference pattern with a webcam, then uses it to calculate the light's wavelength to within a few picometers. [Preview Abstract] |
Friday, October 11, 2019 11:06AM - 11:18AM |
B03.00003: Optical Study of CdTe Quantum Dots for use in Temperature Sensors James Erikson Quantum dots are molecules made to a specific size in order to preserve quantum properties, allowing their use in myriad applications. We are investigating CdTe quantum dots with an energy gap tuned to 2 eV for potential use as a non-invasive temperature sensor. We are working to develop a model for the temperature dependence of the lifetime of stimulated photoluminescence. Lifetime is measured using time correlated single photon counting over a wide range of temperatures. Our attempts to find a mathematical model to describe the dependence have met with little success, however through the application of machine learning algorithms we are able to accurately determine temperatures with an uncertainty of approximately 1 K. [Preview Abstract] |
Friday, October 11, 2019 11:18AM - 11:30AM |
B03.00004: Progress in Imaging of Barium Atoms in Solid Xenon at CSU James Todd, David Fairbank, Chris Chambers, 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 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, imaging techniques of barium in solid xenon (SXe) are being developed and improved at Colorado State University that utilize scanning a focused laser beam over the Ba and SXe deposit. Images of individual barium atoms in different SXe matrix sites will be presented, and progress toward imaging of individual Ba$+$ ions in SXe will be reported. [Preview Abstract] |
Friday, October 11, 2019 11:30AM - 11:42AM |
B03.00005: Casimir torque on chains of nanoparticles Stephen Sanders, Wilton J. M. Kort-Kamp, Diego A. R. Dalvit, Alejandro Manjavacas The fluctuations of the electromagnetic field give rise to interesting phenomena such as Casimir interactions, which can lead to very strong noncontact forces and torques in the nanoscale. Although these interactions produce friction and stiction that may affect the moving parts of nanoscale devices, they also constitute an opportunity to achieve an efficient transfer of momentum at the nanoscale. To that end, here, we explore the dynamics of a chain of rotating nanoparticles mediated by the Casimir torque. We derive an analytical expression describing the angular momentum transfer and show that for angular velocities that are currently achievable, the dynamics of an arbitrary chain can be determined from a set of natural modes and their corresponding decay rates. Exploiting this methodology we study different examples of exotic rotational dynamics. Our results show that Casimir interactions can mediate an efficient transfer of angular momentum at the nanoscale and, therefore, have important implications for the design of nanomechanical devices. [Preview Abstract] |
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