PLENARY SPEECH: Arno Rauschenbeutel
Professor at Department of Physics, Humboldt-Universität zu Berlin, Germany
Title: Seeing A Single Atom Where It Is Not
The precise determination of the position of sub-wavelength scale emitters and scatterers using far-field optical imaging techniques is of utmost importance for a wide range of applications in medicine, biology, astronomy, and physics. In this talk, I theoretically and experimentally show that, for a standard optical imaging system like an optical microscope, the image of an elliptically polarized point-like emitter does not coincide with the emitter's real position. Instead, even for perfect, aberration-free imaging with high numerical aperture, the image will in general be shifted. This can lead to a systematic error in the optical localization of emitters which exceeds the typical precision of super-localization microscopes by far. Moreover, for the case of small numerical aperture, the shift can in principle reach arbitrarily large values. Imaging a single trapped atom as well as a single gold nanoparticle, we experimentally demonstrate this effect and observe wavelength-scale shifts. Beyond its relevance for optical imaging, the demonstrated phenomenon may also occur for sources of other types of waves. Consequently, it can, e.g., impede the precision of the localization of remote objects with imaging radar and sonar as well as the future localization of stellar objects in gravitational wave astronomy.
More about the speaker
Arno Rauschenbeutel did his PhD in the group of Serge Haroche at ENS. He was Senior Scientist at the University of Bonn, Full Professor at the University of Mainz, and leader of the Applied Quantum Physics Group as well as Director of Atominstitut at TU Wien. Since 2018, he is an Alexander von Humboldt Professor and the leader of the Fundamentals of Optics and Photonics Group at HU Berlin. His research focuses on experimental quantum optics, nanophotonics, hybrid quantum systems, optical nanofibers, and optical microresonators. His group has pioneered the use of subwavelength-diameter optical fibers in quantum optical experiments. Arno Rauschenbeutel received a Marie Curie Excellence Award (EC), a European Young Investigators Award (ESF), a Lichtenberg-Professorship (VolkswagenFoundation), an ERC Consolidator Grant, and an Alexander von Humboldt Professorship (Alexander von Humboldt Foundation).
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