FiND: Few-shot three-dimensional image-free confocal focusing on point-like emitters

Confocal fluorescence microscopy is widely applied for the study of point-like emitters such as biomolecules, material defects, and quantum light sources. Confocal techniques offer increased optical resolution, dramatic fluorescence background rejection and sub-nanometer localization, useful in super-resolution imaging of fluorescent biomarkers, single-molecule tracking, or the characterization of quantum emitters. However, rapid, noise-robust automated 3D focusing on point-like emitters has been missing for confocal microscopes. Here, we introduce FiND (Focusing in Noisy Domain), an imaging-free, non-trained 3D focusing framework that requires no hardware add-ons or modifications. FiND achieves focusing for signal-to-noise ratios down to 1, with a few-shot operation for signal-to-noise ratios above 5. FiND enables unsupervised, large-scale focusing on a heterogeneous set of quantum emitters. Additionally, we demonstrate the potential of FiND for real-time 3D tracking by following the drift trajectory of a single NV center indefinitely with a positional precision of < 10 nm. Our results show that FiND is a useful focusing framework for the scalable analysis of point-like emitters in biology, material science, and quantum optics.Comment: 17 pages, 7 figure

Digitizing St. Augustine\u27s Civil War Years

I will be working in the archive at St. Augustine Historical Society’s Research library on, “Digitizing St. Augustine’s Civil War Years.” The project is an effort to transcribe and encode primary documents pertaining to the era using TEI-XML, towards the creation of a digital archive available within the SAHS online catalogue. Period photographs taken by Sam A. Cooley will buttress the documents with views of Forth Marion, the USS George C. Collins, St. Francis Barracks and other structures related to the war effort. Using letters, journals, transcripts, and pension forms, this project will put together a social picture, posing the question: “What was day-to-day life like in Civil War St. Augustine?” Written during his stay, Union captain Blaky Mason’s 8-page “Report on St. Augustine” describes the town as a “curious looking old dilapidated thing” in between descriptions of Barrack conditions, Fort Marion and the recently constructed sea wall. Valuable, is his street level view of the town’s diverse population during occupation. “Next the streets will be thronged with Priests – Sisters of Charity – Spaniards – Minorcans - Soldiers and blacks,” comparing the scene to nothing he’d experienced in his home of Kingston, N.H. Actions against citizen dissent will be presented with Union arrest transcripts. St. Augustine resident, Miss Christina Sanchez was detained for treason after a small confederate flag was found attached to a birdcage in her house. The charges were later acquitted as the canary was found to be treasonous and not her

DEVELOPMENT AND OPERATION OF ACTIVE DISTRIBUTION NETWORKS: RESULTS OF CIGRE C6.11 WORKING GROUP

ABSTRAC

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities.

Owing to its relativistic low-energy charge carriers, the interaction between graphene and various impurities leads to a wealth of new physics and degrees of freedom to control electronic devices. In particular, the behavior of graphene's charge carriers in response to potentials from charged Coulomb impurities is predicted to differ significantly from that of most materials. Scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) can provide detailed information on both the spatial and energy dependence of graphene's electronic structure in the presence of a charged impurity. The design of a hybrid impurity-graphene device, fabricated using controlled deposition of impurities onto a back-gated graphene surface, has enabled several novel methods for controllably tuning graphene's electronic properties. Electrostatic gating enables control of the charge carrier density in graphene and the ability to reversibly tune the charge and/or molecular states of an impurity. This paper outlines the process of fabricating a gate-tunable graphene device decorated with individual Coulomb impurities for combined STM/STS studies. These studies provide valuable insights into the underlying physics, as well as signposts for designing hybrid graphene devices

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities.

Owing to its relativistic low-energy charge carriers, the interaction between graphene and various impurities leads to a wealth of new physics and degrees of freedom to control electronic devices. In particular, the behavior of graphene's charge carriers in response to potentials from charged Coulomb impurities is predicted to differ significantly from that of most materials. Scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) can provide detailed information on both the spatial and energy dependence of graphene's electronic structure in the presence of a charged impurity. The design of a hybrid impurity-graphene device, fabricated using controlled deposition of impurities onto a back-gated graphene surface, has enabled several novel methods for controllably tuning graphene's electronic properties. Electrostatic gating enables control of the charge carrier density in graphene and the ability to reversibly tune the charge and/or molecular states of an impurity. This paper outlines the process of fabricating a gate-tunable graphene device decorated with individual Coulomb impurities for combined STM/STS studies. These studies provide valuable insights into the underlying physics, as well as signposts for designing hybrid graphene devices