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Journal Article

Weak measurement enhanced spin Hall effect of light for particle displacement sensing

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

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

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

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Leuchs,  Gerd
Leuchs Division, 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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Citation

Neugebauer, M., Nechayev, S., Vorndran, M., Leuchs, G., & Banzer, P. (2019). Weak measurement enhanced spin Hall effect of light for particle displacement sensing. Nano Letters, 19(1), 422-425. doi:10.1021/acs.nanolett.8b04219.


Cite as: https://hdl.handle.net/21.11116/0000-0002-AE8D-C
Abstract
A spherical nanoparticle can scatter tightly focused optical beams in a spin-segmented manner, meaning that the far field of the scattered light exhibits laterally separated left- and right-handed circularly polarized components. This effect, commonly referred to as giant spin Hall effect of light, strongly depends on the position of the scatterer in the focal volume. Here, a scheme that utilizes an optical weak measurement in a cylindrical polarization basis is put forward to drastically enhance the spin-segmentation and, therefore, the sensitivity to small displacements of a scatterer. In particular, we experimentally achieve a change of the spin-splitting signal of 5% per nanometer displacement.