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Imaging the field inside nanophotonic accelerators.

Published version
Peer-reviewed

Repository DOI


Type

Article

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Authors

Fishman, Tal 
Dahan, Raphael 
Yannai, Michael 
Adiv, Yuval 

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.

Description

Keywords

40 Engineering, 4009 Electronics, Sensors and Digital Hardware, 51 Physical Sciences, Bioengineering, Generic health relevance

Journal Title

Nat Commun

Conference Name

Journal ISSN

2041-1723
2041-1723

Volume Title

14

Publisher

Springer Science and Business Media LLC
Sponsorship
Gordon and Betty Moore Foundation (Gordon E. and Betty I. Moore Foundation) (4744)
European Research Council (884217)
Israel Science Foundation (ISF) (830/19)
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