Plasmonic helical nanoantenna as a converter between longitudinal fields and circularly polarized waves

Thierry Grosjean; Mengjia Wang; Zhijin Huang; Roland Salut; Miguel Ángel Suárez; Nicolas Martin; Huihui Lu

doi:10.1117/12.2613009

5 March 2022 Plasmonic helical nanoantenna as a converter between longitudinal fields and circularly polarized waves

Thierry Grosjean, Mengjia Wang, Zhijin Huang, Roland Salut, Miguel Ángel Suárez, Nicolas Martin, Huihui Lu

Proceedings Volume PC12010, Photonic and Phononic Properties of Engineered Nanostructures XII; PC120100T (2022) https://doi.org/10.1117/12.2613009
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

A wide variety of optical applications and techniques require control of light polarization. So far, the manipulation of light polarization relies on components capable of interchanging two polarization states of the transverse field of a propagating wave (e.g., linear to circular polarizations, and vice versa). Here, we demonstrate that an individual helical nanoantenna is capable of locally converting longitudinally-polarized confined near-fields into a circularly polarized freely propagating wave, and vice versa. To this end, the nanoantenna is coupled to cylindrical surface plasmons bound to the top interface of a thin gold layer. Helices of constant and varying pitch lengths are experimentally investigated. The reciprocal conversion of an incoming circularly wave into diverging cylindrical surface plasmons is demonstrated as well. Interconnecting circularly-polarized optical waves and longitudinal near-fields provides a new degree of freedom in light polarization control.

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Citation Download Citation

Thierry Grosjean, Mengjia Wang, Zhijin Huang, Roland Salut, Miguel Ángel Suárez, Nicolas Martin, and Huihui Lu "Plasmonic helical nanoantenna as a converter between longitudinal fields and circularly polarized waves", Proc. SPIE PC12010, Photonic and Phononic Properties of Engineered Nanostructures XII, PC120100T (5 March 2022); https://doi.org/10.1117/12.2613009

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KEYWORDS

Plasmonics

Nanoantennas

Polarization

Polarization control

Materials processing

Metamaterials

Optical components

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