Imaging the field inside nanophotonic accelerators

Tal Fishman (), Urs Haeusler, Raphael Dahan, Michael Yannai, Yuval Adiv, Tom Lenkiewicz Abudi, Roy Shiloh, Ori Eyal, Peyman Yousefi, Gadi Eisenstein, Peter Hommelhoff and Ido Kaminer ()
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Tal Fishman: Technion – Israel Institute of Technology
Urs Haeusler: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Raphael Dahan: Technion – Israel Institute of Technology
Michael Yannai: Technion – Israel Institute of Technology
Yuval Adiv: Technion – Israel Institute of Technology
Tom Lenkiewicz Abudi: Technion – Israel Institute of Technology
Roy Shiloh: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Ori Eyal: Technion – Israel Institute of Technology
Peyman Yousefi: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Gadi Eisenstein: Technion – Israel Institute of Technology
Peter Hommelhoff: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Ido Kaminer: Technion – Israel Institute of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Controlling optical fields on the subwavelength scale is at the core of nanophotonics. Laser-driven nanophotonic particle accelerators promise a compact alternative to conventional radiofrequency-based accelerators. Efficient electron acceleration in nanophotonic devices critically depends on achieving nanometer control of the internal optical nearfield. However, these nearfields have so far been inaccessible due to the complexity of the devices and their geometrical constraints, hampering the design of future nanophotonic accelerators. Here we image the field distribution inside a nanophotonic accelerator, for which we developed a technique for frequency-tunable deep-subwavelength resolution of nearfields based on photon-induced nearfield electron-microscopy. Our experiments, complemented by 3D simulations, unveil surprising deviations in two leading nanophotonic accelerator designs, showing complex field distributions related to intricate 3D features in the device and its fabrication tolerances. We envision an extension of our method for full 3D field tomography, which is key for the future design of highly efficient nanophotonic devices.

Date: 2023
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DOI: 10.1038/s41467-023-38857-z

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