• Photonics Research
  • Vol. 12, Issue 8, 1750 (2024)
Zhenxin Wang1, Alexey V. Krasavin2, Chenxinyu Pan1, Junsheng Zheng1..., Zhiyong Li1,3, Xin Guo1,3, Anatoly V. Zayats2, Limin Tong1 and Pan Wang1,3,*|Show fewer author(s)
Author Affiliations
  • 1State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
  • 2Department of Physics and London Centre for Nanotechnology, King’s College London, Strand, London WC2R 2LS, UK
  • 3Jiaxing Key Laboratory of Photonic Sensing & Intelligent Imaging, Intelligent Optics & Photonics Research Center, Jiaxing Research Institute Zhejiang University, Jiaxing 314000, China
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    DOI: 10.1364/PRJ.522533 Cite this Article Set citation alerts
    Zhenxin Wang, Alexey V. Krasavin, Chenxinyu Pan, Junsheng Zheng, Zhiyong Li, Xin Guo, Anatoly V. Zayats, Limin Tong, Pan Wang, "Electric tuning of plasmonic resonances in ultrathin gold nanoribbon arrays," Photonics Res. 12, 1750 (2024) Copy Citation Text show less

    Abstract

    Ultrathin plasmonic nanostructures offer an unparalleled opportunity for the study of light–matter interactions at the nanoscale and realization of compact nanophotonic devices. In this study, we introduce an ultrathin gold nanoribbon array and demonstrate an electric approach to actively tuning its plasmonic resonance, which leveraging the extreme light confinement capability in the ultrathin plasmonic nanostructure and a robust nanoscale electro-optical effect in indium tin oxide. Optimizing the design (to a total thickness as small as 12 nm for a 2-nm-thick gold nanoribbon array), we numerically demonstrate a spectral shift in the plasmonic resonance up to 36 nm along with an approximately 16% change in the transmission at a gate voltage below 1.7 V at the wavelength of 1.47 μm. This work presents progress towards electric tuning of plasmonic resonances in ultrathin metallic nanostructures for various applications including surface-enhanced spectroscopy, spontaneous emission enhancement, and optical modulation.
    εITO(x,y)=εωp(x,y)2ω2+iγω,(A1)

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    ωp(x,y)=(n(x,y)q2ε0m*)12,(A2)

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    n(x,y)=83π(2πm*q(EF+φ(x,y))2)32,(A3)

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    EF=(3π2n0)2/322m*(A4)

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    εscf=εOlmon+ωp2ω2+iωγscωp2ω2+iωγscf,(B1)

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    γscf=γsc13τscυF2h(1p)1(1t31t5)1exp(hτscυFt)1pexp(hτscυFt)dt,(B2)

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    Zhenxin Wang, Alexey V. Krasavin, Chenxinyu Pan, Junsheng Zheng, Zhiyong Li, Xin Guo, Anatoly V. Zayats, Limin Tong, Pan Wang, "Electric tuning of plasmonic resonances in ultrathin gold nanoribbon arrays," Photonics Res. 12, 1750 (2024)
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