Bulletin of the American Physical Society
Four Corners Section 2022 Meeting
Volume 67, Number 14
Friday–Saturday, October 14–15, 2022; Albuquerque, New Mexico
Session J03: Atomic, Molecular, and Optical Physics II |
Hide Abstracts |
Chair: Dylan Yost, Colorado State University Room: UNM PAIS 1160 |
Saturday, October 15, 2022 8:30AM - 8:42AM |
J03.00001: Investigation of inversion interferometry for superresolving point sources in optical microscopy Sujeet Pani, Sajjad A Khan, Diane S. Lidke, Keith A. Lidke, Francisco E Becerra Modal imaging can provide unprecedented resolution for imaging point sources such as single-molecule fluorescent tags used to study biological samples. Theoretical work show that modal imaging can approach quantum limits of optical resolution of thermal point sources as quantified by Quantum Cramer Rao Bound [1], albeit assuming highly idealized measurements described by complex quantum operators. To utilize the potential of quantum measurements for superresolution microscopy it is imperative to understand the critical parameters in optical systems for realizing such quantum measurements under realistic conditions. Our efforts focus on understanding these critical parameters and developing an optical system for superresolving two incoherent point sources (i.e. fluorophore tags) for studying biological samples. We use a Mach-Zehnder interferometer with optical field inversion to realize image inversion interferometry, in principle allowing for near quantum-optimal measurement for imaging point sources. In our work, we combine inversion interferometry with florescence microscopy to image fluorescent beads acting as point sources. We investigate the performance of this technique and characterize the effects of aberrations and source bandwidth in the interference visibility. We plan to use this setup to realize superresolving measurements of single-molecule fluorescence and finally, protein dynamics in biological samples. |
Saturday, October 15, 2022 8:42AM - 8:54AM |
J03.00002: High-speed isotropic-resolution axially swept light-sheet microscopy Md Nasful Huda Prince, Tonmoy Chakraborty Light-sheet fluorescence microscopy (LSFM) is a rapidly evolving imaging technology which is revolutionizing biomedical imaging due to its faster imaging speed and gentler illumination scheme. Lately, a variant of LSFM, called Axially swept light-sheet microscope (ASLM) has emerged as a promising technique: not only does it offer isotropic (XYZ) sub-micron resolution in tissues, it can also be scaled to acquire large field-of-view. However, ASLM suffers from two fundamental problems: lower detection signal and low achievable frame-rate which limit the choice of ASLM in several cases. Recently, we showed that simultaneous scanning two stacked light-sheets not only increased the imaging speed but also doubled ASLM's signal performance. Here we push this idea further and propose a simple construction of dual-focus ASLM that offers better control of the focus position which ultimately pushes the imaging speed of ASLM from 10 frames-per-second (FPS) to 40 FPS. |
Saturday, October 15, 2022 8:54AM - 9:06AM |
J03.00003: Comparison of Soft and Hard Mask Etch Templates for Subtractive Processing of High-Q SiN Microresonators Lala Rukh, Gabriel M Colacion, Tara Drake Optical frequency combs created in chip-scale photonic resonators (microcombs) have a wide range of applications in optical metrology, ranging, and frequency synthesis. Silicon nitride (SiN) microring resonators, popular for microcomb platforms, can be printed directly on silicon wafer substrates, which allows for geometric dispersion control and planar integration with other CMOS-compatible processes. However, SiN is resistant to most etching recipes, and it can be difficult to subtractively pattern SiN devices, where waveguides are lithographically printed onto a mask and transferred to a thick SiN layer via etching. It is typically necessary to increase either mask thickness or etch selectivity for such processes. Here, we present a comparison of two subtractive processes for the fabrication of silicon nitride waveguide resonators, one using a polymer-based photoresist “soft” mask and the other using a metallic “hard” mask. This work will focus on advantages and drawbacks of using both techniques and compare the optical performance of the fabricated waveguides. This work illustrates two reliable methods for the fabrication of high-Q on-chip resonators and lays the foundation for future fabrication of nonlinear photonic devices. |
Saturday, October 15, 2022 9:06AM - 9:18AM |
J03.00004: Bleaching of Emissions From Xenon Trapped Barium Connor D Taylor, Jennifer Stanley, Joe Soderstrom, William Fairbank, Mari Yvaine When light is shined on barium atoms trapped in a solid xenon matrix, the light they emit only lasts for a finite time. This process is called bleaching, and is not well understood. We are investigating emissions produced by single barium atoms in solid xenon as a posible future means of discriminating background events from those of interest for nEXO's neutrinoless double beta decay search1. Bleaching limits the duration of fluorescence from a single barium atom, and thus the strength of single atom signals in a scanned image. Thus, it is important to understand the properties of bleaching to overcome it. In recent experiments we have found that annealing in the dark shows consistent recovery of lost signal from bleached barium samples in xenon cavities. In some cases, after annealing, we see an increase in signal from Ba atoms in a 7-vacancy site, and a decrease in signal from Ba atoms in a 4-vacancy site. Changes like this indicate barium atom transitions between vacancy sites. |
Saturday, October 15, 2022 9:18AM - 9:30AM |
J03.00005: Barium tagging for Enhanced Double Beta Decay search for Majorana Neutrinos William M M Fairbank, Jennifer Stanley, Joe Soderstrom, Connor Taylor, Mari Yvaine Neutrinoless double beta decay is forbidden by the Standard Model of elementary particles. The nEXO collaboration aims to observe 136Xe neutrinoless double beta decay to 136Ba, which would confirm that the neutrino is a Majorana particle. The use of single atom imaging to identify the daughter barium could enhance nEXO's sensitivity in the future. Capturing the Ba atom in a solid xenon matrix is part of the technique being developed. Ba daughters trapped in a xenon ice matrix would then be detected and counted by single atom imaging. |
Saturday, October 15, 2022 9:30AM - 9:42AM |
J03.00006: A Stitching Algorithm for High-order Spatial Frequencies in Diffraction Pattern Data Jeremy Tait, Vern Hart Coherent diffractive imaging is not limited by the classic Rayleigh criterion that restricts resolution in conventional microscopy. In CDI, resolution is limited only by the spatial frequencies of data collected in an image. However, higher spatial frequencies occur at larger distances from the central bright spot, where low signal-to-noise ratios make data collection more difficult. As such, we have developed a technique in which a lens is mounted to a movable translation stage holding a beam profiler. This lens is used to magnify weak signals at the edges of diffraction patterns but induces a shift between distances in the object plane and the detector plane. As a result, images collected at varying positions will overlap and include redundant image data. We will present a numerical technique used to identify this scaling fraction between the two planes and stich multiple overlapping images to create a single composite diffraction pattern for enhanced reconstruction resolution. Results will be provided for an Air Force target card and adherent mammalian cancer cells used as imaging samples. |
Saturday, October 15, 2022 9:42AM - 9:54AM |
J03.00007: Exact energy eigenstates of the Coulomb-Stark Hamiltonian Seyedmohammad Yusofsani, Miroslav Kolesik We propose an approximation-free solution to the problem of an electron subject to a central Coulomb potential and a constant uniform electric field of high intensity i.e. the Stark-Coulomb problem. We introduce an algorithm to calculate the eigenstates of the Coulomb-Stark problem using a modest computational setup together with their proper normalization. Using this algorithm, calculating the Coulomb-Stark eigenstates is not harder than other special functions. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700