Journal
OPTICS LETTERS
Volume 40, Issue 8, Pages 1687-1690Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.40.001687
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Funding
- Russian Foundation for Basic Research [14-02-31323-mol_a, 14-02-00205-a, 15-02-50026-a, 14-32-50026 mol_nr]
- project of the RAS Presidium Program
- Russia Federation Ministry of Science and Education [02.G25.31.0116]
- Ministry of Science and Education
- RF Ministry of Science and Education through the Grant of the RF president [MK-3056.2015.2]
- Government of the Russian Federation through ITMO Post-Doctoral Fellowship [074-U01]
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In this work, we demonstrate an all-laser method of fabrication of optical nanoantennas (ONAs) with an additional coupling/focusing diffractive element. This method is based on double-shot femtosecond laser nanoablation of a thin supported metallic film, inducing a sequence of electrodynamic (surface plasmon-polariton [SPP] excitation and interference), thermal (melting, ablation and ultrafast cooling), and hydrodynamic processes. In particular, the thermal and hydrodynamic processes are important for ONA formation after the first laser shot, while second spatially shifted laser shot via an induced SPP wave results in a radial surface grating near the nanoantenna. Such gratings provide efficient coupling between incident laser radiation and SPP waves, thus significantly improving the ONA efficiency. (C) 2015 Optical Society of America
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