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Optical transverse spin coupling through a plasmonic nanoparticle for particle-identification and field-mapping

Abstract

Electromagnetic fields at near-field exhibit distinctive properties with respect to their free-space counterparts. In particular, an optical transverse spin appearing in a confined electromagnetic field provides the foundation for many intriguing physical effects and applications. We present a transverse spin coupling configuration where plasmonic nanoparticles are employed to couple the transverse spin in a focused beam to that of a surface plasmon polariton. The plasmonic resonance of nano-particles on a metal film plays a significant role on the transverse spin coupling. We demonstrate in experiments that Ag and Au nanoparticles yield distinct imaging patterns when scanned over a focused field, because of their different plasmonic responses to the transverse and longitudinal electric fields. Such resonance-dependent spin-coupling enables identification of nanoparticles using a focused field, as well as electric field mapping of a specific field component of a focused beam using a plasmonic nanoparticle. These interesting finds regarding the transverse spin coupling with a plasmonic nanoparticle may find valuable applications in near-field and nano-optics.

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Publication details

The article was received on 26 Feb 2018, accepted on 12 Apr 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR01618F
Citation: Nanoscale, 2018, Accepted Manuscript
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    Optical transverse spin coupling through a plasmonic nanoparticle for particle-identification and field-mapping

    A. Yang, L. Du, F. Meng and X. Yuan, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01618F

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