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We report on the generation of extreme ultraviolet radiation utilizingthe plasmonic field enhancement in arrays of bow-tie gold opticalantennae. Furthermore, their suitability to support high-order harmonicgeneration is examined by means of finite-difference time-domaincalculations and experiments. Particular emphasis is paid to the thermalproperties, which become significant at the employed peak intensities. Adamage threshold depending on the antenna length is predicted andconfirmed by our experimental findings. Moreover, the gas density in thevicinity of the antennae is characterized experimentally to determinethe number of atoms contributing to the measured radiation, which isalmost an order of magnitude larger than previously reported.DFG/EXC/QUES

Bow-tie nano-antenna assisted generation of extreme ultraviolet radiation