Generation and subwavelength focusing of longitudinal magnetic fields in a metallized fiber tip

Abstract

We demonstrate experimentally and numerically that in fiber tips as they are used in NSOMs azimuthally polarized electrical fields (|E${}_{\text{azi}}$|${}^2$/|E${}_{\text{tot}}$|${}^2$ $\approx$ 55% $\pm$ 5% for 1.4μm tip aperture diameter and λ${}_0$ = 1550nm), respectively subwavelength confined (FWHM $\approx$ 450nm $\approx$ λ${}_0$/3.5) magnetic fields, are generated for a certain tip aperture diameter (d = 1.4μm). We attribute the generation of this field distribution in metal-coated fiber tips to symmetry breaking in the bend and subsequent plasmonic mode filtering in the truncated conical taper.

11 pages, 6 figures

References in corpus (1)

• Functional plasmonic nano-circuits with low insertion and propagation losses

Cited by in corpus (2)

• Polarization features of optically pumped CdS nanowire lasers
• Near-Field Analysis of Bright and Dark Modes on Plasmonic Metasurfaces Showing Extraordinary Suppressed Transmission