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- W3201616986 abstract "The generation of radiation from free electrons passing a grating, known as Smith–Purcell radiation, finds various applications, including nondestructive beam diagnostics and tunable light sources, ranging from terahertz toward X-rays. So far, the gratings used for this purpose have been designed manually, based on human intuition and simple geometric shapes. Here we apply the computer-based technique of nanophotonic inverse design to build a 1400 nm Smith–Purcell radiator for subrelativistic 30 keV electrons. We demonstrate that the resulting silicon nanostructure radiates with a 3× higher efficiency and 2.2× higher overall power than previously used rectangular gratings. With better fabrication accuracy and for the same electron–structure distance, simulations suggest a superiority by a factor of 96 in peak efficiency. While increasing the efficiency is a key step needed for practical applications of free-electron radiators, inverse design also allows to shape the spectral and spatial emission in ways inaccessible with the human mind." @default.
- W3201616986 created "2021-09-27" @default.
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- W3201616986 date "2022-01-21" @default.
- W3201616986 modified "2023-10-14" @default.
- W3201616986 title "Boosting the Efficiency of Smith–Purcell Radiators Using Nanophotonic Inverse Design" @default.
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- W3201616986 doi "https://doi.org/10.1021/acsphotonics.1c01687" @default.
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