Bulletin of the American Physical Society
Mid-Atlantic Section 2022 Meeting
Volume 67, Number 20
Friday–Sunday, December 2–4, 2022; University Park, PA, Pennsylvania State University
Session G04: AMO, and Laser Physics |
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Chair: Abhinava Chatterjee, Pennsylvania State Univeristy Room: Pennsylvania State University Osmond 106 |
Sunday, December 4, 2022 9:00AM - 9:35AM |
G04.00001: Room-temperature strong coupling in plasmonic nanocavities Invited Speaker: Matthew A Pelton Coupling optical and vibrational transitions in molecular or solid-state systems to a single mode of an optical cavity has the potential to enable nonlinear-optical applications and control of chemical pathways. These applications arise both in the strong-coupling regime and in the high-cooperativity regimes, which both require coupling strengths to be large compared to decoherence rates of the emitter and of the cavity photons. In photonic cavities, the diffraction limit places a minimum on the mode volume and thus a maximum on the coupling strength; strong coupling in these cavities therefore generally requires operation at cryogenic temperatures when small numbers of emitters are involved. Using plasmonic nanocavities overcomes this restriction, enabling high cooperativity and strong coupling at room temperature with a single quantum dot, ultrastrong coupling in the infrared with a microscopic volume of material, and second-harmonic generation from strongly-coupled states. |
Sunday, December 4, 2022 9:35AM - 9:47AM |
G04.00002: Rydberg Raman Ramsey EIT Robert J Behary, Irina B Novikova, Eugeniy E Mikhailov, Alex Gill, Aaron Buikema Rydberg states of atoms are interesting because of their high electric susceptibility that enable their potential application in sensitive electric field sensors. Electromagnetically induced transparency (EIT) – a two-photon transmission peak induced by interaction of two counter-propagating optical fields at 780 nm and 480 nm – provides easy optical readout, as the change in optical transmission is determined by the applied electric field. However, the sensitivity of such optical detectors is limited by the spectral width of the EIT peak, which in the thermal vapor is limited by the two-photon Doppler broadening to approx 5 MHz. Here we theoretically investigate the possibility to reduce the sensor response by reducing the resonance width using a Ramsey interrogation. Two spatially separated EIT channels create a Ramsey sequence where the atomic Rydberg coherence is prepared in the first region, evolves with no applied optical fields as atoms cross the region between the two channels , and then is probed in the second channel. We show that the linewidth of such Raman-Ramsey fringe can be theoretically reduced to 50 kHz with room temperature Rydberg atoms. This theoretical work suggests a potential solution to have a narrow EIT feature with reduced power broadening that can be potentially beneficial for boosting the sensitivity of EIT-based Rydberg electrometers. |
Sunday, December 4, 2022 9:47AM - 9:59AM |
G04.00003: Imaging charged particle beams with atomic magnetometers Nicolas C DeStefano, Irina B Novikova, Eugeniy E Mikhailov, Seth Aubin, Todd D Averett, Saeed Pegahan, Shukui Zhang, Alexandre Camsonne, Gunn Park We develop a non-invasive approach to image charged particle current density and obtain its profile in 2 (and eventually 3) dimensions by analyzing the electron beam effect on the quantum state of surrounding alkali vapor. Specifically, we can measure the magnetic field of the moving electrons through nonlinear magneto-optical polarization rotation produced by the Rb atoms. By imaging the components of the optical field's polarization via cameras, we successfully detected characteristic signatures of the electron beam and extracted basic electron beam characteristics, such as its position, width, and current density. Potentially, such approach can produce a three-dimensional image of the beam by illuminating the interaction region from two orthogonal directions. While the immediate motivation for the project is its implementation as a high energy particle beam diagnostic tool for use at the Thomas Jefferson National Accelerator Facility, this approach to charged particle detection may have broad range of applications in nuclear and accelerator physics. |
Sunday, December 4, 2022 9:59AM - 10:11AM |
G04.00004: Inverse Design of a Polarization Demultiplexer Photonic Circuit William G Eshbaugh Single quantum dots are excellent candidates for on-chip production of entangled photon pairs. |
Sunday, December 4, 2022 10:11AM - 10:23AM |
G04.00005: Organic Photovoltaics: A Promising Solution to Climate Change Alyssa L Miller, Alyssa L Miller, Hafiz K Sheriff, Stephen R Forrest, Kurt Andresen Organic photovoltaics (OPVs) present a promising solution to the climate change challenge. Given their light weight, flexibility and potential ease of fabrication, these devices can be applied to almost any surface that is illuminated by sunlight for onsite energy harvesting. In this talk, we will report on summer research that covered the design and fabrication of a special class of OPVs called semi-transparent OPVs (ST-OPVs) and how they can be integrated within windows of buildings to support cities. We will discuss the design and fabrication of the opaque OPV from which these ST-OPVs derive, and the optical designs that can be employed to enhance the performance of ST-OPVs. Finally, the stability of these devices and their current limitations to commercialization will be considered. |
Sunday, December 4, 2022 10:23AM - 10:35AM |
G04.00006: Pseudo-APT symmetry with Four-Wave Mixing in hot Rubidium atoms Ziqi Niu, Irina B Novikova, Jianming Wen, Shengwang Du, Mengxin Du, Chuanwei Zhang In the last decades physicists are increasingly interested in properties of systems with non-Hermitian Hamiltonian H symmetric under Parity-Time(PT) transformation (such that [H,PT]=0). Such systems can undergo a transition from having real to imaginary eigenvalues at a singular point of the parameter space, referred to as an Exceptional Point (EP). Since minimal changes in the system near EP yield dramatic alterations in the output, such behavior enables, in principle, extremely sensitive sensors. Later it was shown that analogous behavior is expected for an anti-Parity-Time (APT) symmetric system, for which {H,PT}=0, but without intrinsic losses, making it attractive for quantum sensing. Here we investigate the prospective of implementing an APT symmetric system via nonlinear four-wave mixing interaction in a thermal Rb vapor, widely used for two-mode squeezing and entanglement generation. We theoretically demonstrate that the propagation of two conjugate optical fields in a double-Λ scheme under realistic experimental conditions can be equivalent to the anti-PT Hamiltonian. We also experimentally characterize classical and quantum properties of the two twin outputs around EP. Our experimental observations show good agreement with the numerical simulations. |
Sunday, December 4, 2022 10:35AM - 10:47AM |
G04.00007: Single-pixel Imaging with Full Wavefront Reconstruction via Homodyne Detection Charris A Gabaldon, Savannah Cuozzo, Pratik J Barge, Ziqi Niu, Hwang Lee, Lior Cohen, Irina B Novikova, Eugeniy E Mikhailov We reconstruct full wavefronts of various objects using spatial recovery in single pixel imaging (SPI) with homodyne detection. To accomplish that we place a set of masks on the local oscillator (LO) and record the interference fringe between the LO and the probe (after its interaction with the object) for each mask by varying their relative phase. This allows the recovery of amplitude and phase of reconstruction coefficients for every applied mask. A priori information pertaining to the object and illuminating field are not required as this method is general and can work with weak, varied probe light. This method may be particularly beneficial for the imaging of biological samples that are often translucent. Unlike similar reconstruction methods, there is no need for complex post-processing algorithms, changing focal lengths, or physically redistributing the reference beam or object. |
Sunday, December 4, 2022 10:47AM - 10:59AM |
G04.00008: Reproducible engines and interfaces on heterogeneous compute resources for structural analysis of deformed systems Rohit Goswami We present updates to d-SEAMS: Deferred Structural Elucidation Analysis For Molecular Simulations; a high performance library with a backend in C++ and a Lua frontend. d-SEAMS was initially developed with an eye for ice nucleation studies and continues to have a strong focus on ring structure determination and the analysis of coverage metrics for identifying phase transitions. Recent studies have expanded its usage into the realm of clathrate studies, which involved a restructuring of the internal data structures. To better integrate with heterogeneous computing resources offered with Python bindings, the newer code structure has been augmented to have Python bindings. These enable further workflows which were previously complicated for users to design and run. Following the strategy and design of larger codebases like PyTorch, d-SEAMS v2 provides granular access to the primitives and has helper functions to adapt external codes like ASE for generalization. We discuss the newer design, along with the algorithmic updates through a series of documented systems which are being considered for publication elsewhere. A new plugin framework is also designed to allow easier access from external codes as well. This release takes the engine and system closer to the original goal of being an umbrella software with specialized "glue-code" bindings for both reproducible results (by storing the YAML configurations) and also interactive usage (through Python or Lua bindings). |
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