Journal
NANO LETTERS
Volume 22, Issue 22, Pages 9036-9044Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c03383
Keywords
Magnetoplasmonics; Transparent Conductive Oxides; Nanocrystals; Magneto-optics; Active Plasmonics; Sensing
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Funding
- H2020-FETOPEN-2016-2017
- [737709]
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Research in nano-optics is currently focused on actively modulating plasmonic response, with external magnetic fields being a promising approach. However, limitations of metals hinder the applicability in real-life devices. By using transparent conductive oxide nanocrystals, we demonstrate for the first time outstanding magnetoplasmonic performance, surpassing the current best-in-class approaches.
Active modulation of the plasmonic response is at the forefront of today's research in nano-optics. For a fast and reversible modulation, external magnetic fields are among the most promising approaches. However, fundamental limitations of metals hamper the applicability of magnetoplasmonics in real-life active devices. While improved magnetic modulation is achievable using ferromagnetic or ferromagnetic-noble metal hybrid nanostructures, these suffer from severely broadened plasmonic response, ultimately decreasing their performance. Here we propose a paradigm shift in the choice of materials, demonstrating for the first time the outstanding magnetoplasmonic performance of transparent conductive oxide nanocrystals with plasmon resonance in the near-infrared. We report the highest magneto-optical response for a nonmagnetic plasmonic material employing F- and In-codoped CdO nanocrystals, due to the low carrier effective mass and the reduced plasmon line width. The performance of state-of-the-art ferromagnetic nanostructures in magnetoplasmonic refractometric sensing experiments are exceeded, challenging current best-in-class localized plasmon-based approaches.
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