20 February 2017 Optical fiber plasmonic lens for near-field focusing fabricated through focused ion beam
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Abstract
We report on numerical simulations and fabrication of an optical fiber plasmonic lens for near-field focusing applications. The plasmonic lens consists of an Archimedean spiral structure etched through a 100 nm-thick Au layer on the tip of a single-mode SM600 optical fiber operating at a wavelength of 632:8 nm. Three-dimensional finite-difference time-domain computations show that the relative electric field intensity of the focused spot increases 2:1 times when the number of turns increases from 2 to 12. Furthermore, a reduction of the intensity is observed when the initial inner radius is increased. The optimized plasmonic lens focuses light into a spot with a full-width at half-maximum of 182 nm, beyond the diffraction limit. The lens was fabricated by focused ion beam milling, with a 200nm slit width.
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Karen Sloyan, Henrik Melkonyan, Paulo Moreira, Marcus S. Dahlem, "Optical fiber plasmonic lens for near-field focusing fabricated through focused ion beam", Proc. SPIE 10115, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics X, 101150D (20 February 2017); doi: 10.1117/12.2253594; https://doi.org/10.1117/12.2253594
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