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End date: 2024 × Start date: 2020 × DDC: 530 × Publisher: Berlin : de Gruyter × WGL Institute: IPHT ×

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Now showing 1 - 3 of 3
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    Driving plasmonic nanoantennas at perfect impedance matching using generalized coherent perfect absorption
    (Berlin : de Gruyter, 2021) Grimm, Philipp; Razinskas, Gary; Huang, Jer-Shing; Hecht, Bert
    Coherent perfect absorption (CPA) describes the absence of all outgoing modes from a lossy resonator, driven by lossless incoming modes. Here, we show that for nanoresonators that also exhibit radiative losses, e.g., plasmonic nanoantennas, a generalized version of CPA (gCPA) can be applied. In gCPA outgoing modes are suppressed only for a subset of (guided plasmonic) modes while other (radiative) modes are treated as additional loss channels - a situation typically referred to as perfect impedance matching. Here we make use of gCPA to show how to achieve perfect impedance matching between a single nanowire plasmonic waveguide and a plasmonic nanoantenna. Antennas with both radiant and subradiant characteristics are considered. We further demonstrate potential applications in background-free sensing.
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    A fiber optic-nanophotonic approach to the detection of antibodies and viral particles of COVID-19
    (Berlin : de Gruyter, 2020) Rajil, Navid; Sokolov, Alexei; Yi, Zhenhuan; Adams, Garry; Agarwal, Girish; Belousov, Vsevolod; Brick, Robert; Chapin, Kimberly; Cirillo, Jeffrey; Deckert, Volker; Delfan, Sahar; Esmaeili, Shahriar; Fernández-González, Alma; Fry, Edward; Han, Zehua; Hemmer, Philip; Kattawar, George; Kim, Moochan; Lee, Ming-Che; Lu, Chao-Yang; Mogford, Jon; Neuman, Benjamin; Pan, Jian-Wei; Peng, Tao; Poor, Vincent; Scully, Steven; Shih, Yanhua; Suckewer, Szymon; Svidzinsky, Anatoly; Verhoef, Aart; Wang, Dawei; Wang, Kai; Yan, Lan; Zheltikov, Aleksei; Zhu, Shiyao; Zubairy, Suhail; Scully, Marlan
    Dr. Deborah Birx, the White House Coronavirus Task Force coordinator, told NBC News on "Meet the Press"that "[T]he U.S. needs a 'breakthrough' in coronavirus testing to help screen Americans and get a more accurate picture of the virus' spread."We have been involved with biopathogen detection since the 2001 anthrax attacks and were the first to detect anthrax in real-time. A variation on the laser spectroscopic techniques we developed for the rapid detection of anthrax can be applied to detect the Severe Acute Respiratory Syndrome-Corona Virus-2 (SARS-CoV-2 virus). In addition to detecting a single virus, this technique allows us to read its surface protein structure. In particular, we have been conducting research based on a variety of quantum optical approaches aimed at improving our ability to detect Corona Virus Disease-2019 (COVID-19) viral infection. Indeed, the detection of a small concentration of antibodies, after an infection has passed, is a challenging problem. Likewise, the early detection of disease, even before a detectible antibody population has been established, is very important. Our team is researching both aspects of this problem. The paper is written to stimulate the interest of both physical and biological scientists in this important problem. It is thus written as a combination of tutorial (review) and future work (preview). We join Prof. Federico Capasso and Editor Dennis Couwenberg in expressing our appreciation to all those working so heroically on all aspects of the COVID-19 problem. And we thank Drs. Capasso and Couwenberg for their invitation to write this paper. © 2020 Navid Rajil et al., published by De Gruyter, Berlin/Boston 2020.
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    Three-dimensional spatiotemporal tracking of nano-objects diffusing in water-filled optofluidic microstructured fiber
    (Berlin : de Gruyter, 2020) Jiang, Shiqi; Förster, Ronny; Plidschun, Malte; Kobelke, Jens; Ando, Ron Fatobene; Schmidt, Markus A.
    Three-dimensional (3D) tracking of nano-objects represents a novel pathway for understanding dynamic nanoscale processes within bioanalytics and life science. Here we demonstrate 3D tracking of diffusing 100 nm gold nanosphere within a water-filled optofluidic fiber via elastic light scattering-based position retrieval. Specifically, the correlation between intensity and position inside a region of a fiber-integrated microchannel has been used to decode the axial position from the scattered intensity, while image processing-based tracking was used in the image plane. The 3D trajectory of a diffusing gold nanosphere has been experimentally determined, while the determined diameter analysis matches expectations. Beside key advantages such as homogenous light-line illumination, low-background scattering, long observation time, large number of frames, high temporal and spatial resolution and compatibility with standard microscope, the particular properties of operating with water defines a new bioanalytical platform that is highly relevant for medical and life science applications. © 2020 Shiqi Jiang et al., published by De Gruyter. 2020.