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  Shaping Field Gradients for Nanolocalization

Nechayev, S., Eismann, J., Neugebauer, M., & Banzer, P. (2020). Shaping Field Gradients for Nanolocalization. ACS Photonics, 7(3), 581-587. doi:10.1021/acsphotonics.9b01720.

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Shaping Field Gradients for Nanolocalization.pdf (Preprint), 2MB
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Nechayev, Sergey1, Autor           
Eismann, Jörg1, Autor           
Neugebauer, Martin1, Autor           
Banzer, Peter1, Autor           
Affiliations:
1Interference Microscopy and Nanooptics, Leuchs Emeritus Group, Emeritus Groups, Max Planck Institute for the Science of Light, Max Planck Society, ou_2364700              

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Schlagwörter: Field Gradients, Nanolocalization, Scattering, Dipole, Nanoantenna
 Zusammenfassung: Deep sub-wavelength localization and displacement sensing of optical nanoantennas have emerged as extensively pursued objectives in nanometrology, where focused beams serve as high-precision optical rulers while the scattered light provides an optical readout. Here, we show that in these schemes using an optical excitation as a position gauge implies that the sensitivity to displacements of a nanoantenna depends on the spatial gradients of the excitation field. Specifically, we explore one of such novel localization schemes based on appearance of transversely spinning fields in strongly confined optical beams, resulting in far-field segmentation of left- and right-hand circular polarizations of the scattered light, an effect known as the giant spin-Hall effect of light. We construct vector beams with augmented transverse spin density gradient in the focal plane and experimentally confirm enhanced sensitivity of the far-field spin-segmentation to lateral displacements of an electric-dipole nanoantenna. We conclude that sculpturing of electromagnetic field gradients and intelligent design of scatterers pave the way towards future improvements in displacement sensitivity.

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Sprache(n): eng - English
 Datum: 2020-02-21
 Publikationsstatus: Online veröffentlicht
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 Identifikatoren: arXiv: 1909.13365v1
DOI: 10.1021/acsphotonics.9b01720
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Titel: ACS Photonics
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Washington, DC : American Chemical Society
Seiten: - Band / Heft: 7 (3) Artikelnummer: - Start- / Endseite: 581 - 587 Identifikator: ISSN: 2330-4022
CoNE: https://pure.mpg.de/cone/journals/resource/2330-4022