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Learning to image and compute with multimode optical fibers.
Nanophotonics
February 2022
Laboratory of Applied Photonics Devices, School of Engineering, Ecole Polytechnique Fédérale de Lausanne, Institute of Electrical and MicroEngineering, Lausanne, 1015, Switzerland.
Multimode fibers (MMF) were initially developed to transmit digital information encoded in the time domain. There were few attempts in the late 60s and 70s to transmit analog images through MMF. With the availability of digital spatial modulators, practical image transfer through MMFs has the potential to revolutionize medical endoscopy.
View Article and Find Full Text PDFQuantum Wave-Particle Duality in Free-Electron-Bound-Electron Interaction.
Phys Rev Lett
June 2021
Department of Electrical Engineering Physical Electronics, Center for Laser-Matter Interaction (LMI), Tel Aviv University, Ramat Aviv 69978, Israel.
We present a comprehensive relativistic quantum-mechanical theory for interaction of a free electron with a bound electron in a model, where the free electron is represented as a finite-size quantum electron wave packet (QEW) and the bound electron is modeled by a quantum two-level system (TLS). The analysis reveals the wave-particle duality nature of the QEW, delineating the point-particle-like and wavelike interaction regimes and manifesting the physical reality of the wave function dimensions when interacting with matter. This QEW size dependence may be used for interrogation and coherent control of superposition states in a TLS and for enhancement of cathodoluminescence and electron energy-loss spectroscopy in electron microscopy.
View Article and Find Full Text PDFGover and Yariv Reply.
Phys Rev Lett
January 2021
California Institute of Technology, Pasadena, California 91125, USA.
Free-Electron-Bound-Electron Resonant Interaction.
Phys Rev Lett
February 2020
California Institute of Technology (Caltech), Pasadena, California 91125, USA.
Here we present a new paradigm of free-electron-bound-electron resonant interaction. This concept is based on a recent demonstration of the optical frequency modulation of the free-electron quantum electron wave function (QEW) by an ultrafast laser beam. We assert that pulses of such QEWs correlated in their modulation phase, interact resonantly with two-level systems, inducing resonant quantum transitions when the transition energy ΔE=ℏω_{21} matches a harmonic of the modulation frequency ω_{21}=nω_{b}.
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