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

MPS-Authors
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Ploss,  Daniel
Nonlinear Optics and Nanophotonics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Kriesch,  Arian
Nonlinear Optics and Nanophotonics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Pfeifer,  Hannes
Painter Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Banzer,  Peter
Interference Microscopy and Nanooptics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Peschel,  Ulf
Nonlinear Optics and Nanophotonics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Ploss, D., Kriesch, A., Pfeifer, H., Banzer, P., & Peschel, U. (2014). Generation and subwavelength focusing of longitudinal magnetic fields in a metallized fiber tip. OPTICS EXPRESS, 22(11), 13744-13754. doi:10.1364/OE.22.013744.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-65ED-7
Abstract
We demonstrate experimentally and numerically that in fiber tips as they are used in NSOMs azimuthally polarized electrical fields (broken vertical bar E-azi broken vertical bar(2) / broken vertical bar E-tot broken vertical bar(2) approximate to 55% +/- 5% for lambda(0) = 1550 nm), respectively subwavelength confined (FWHM approximate to 450 nm approximate to lambda(0)/3.5) magnetic fields, are generated for a certain tip aperture diameter (d = 1.4 mu m). 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. (C) 2014 Optical Society of America