Graphene-Gated Control of Ag Nanowire Infrared Polaritons

Surface plasmon polaritons (SPPs) at dielectric-metal interfaces are of significant interest in nanophotonic devices owing to their unique field localization behaviors. Low-dimensional metal structures like metal nanowires generate strong SPP modes, yet dynamic SPP modulation, particularly in the mid-infrared (IR) range, is still underdeveloped, hindering progress in reconfigurable SPP-based devices. Here, we demonstrate active control of mid-IR SPPs in silver nanowires (AgNWs) through electric field gating, taking advantage of a graphene monolayer substrate and its gate-tunable dielectric properties in the mid-IR range. Through IR near-field nanoimaging and numerical simulations, we explore the resulting range of the spectral tuning behavior of the AgNW SPP response. Furthermore, we identify a new gate-dependent decay channel in which SPPs in AgNWs directly dissipate into graphene SPPs. Our findings highlight the potential for utilizing the electrical characteristics of graphene for manipulating SPPs in metal nanowires, paving the way for the development of advanced nanophotonic devices.

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Publication Details

Journal
Nano Letters
Published
2025-10-31
DOI
https://doi.org/10.1021/acs.nanolett.5c04167
Primary Topic
Plasmonic and Surface Plasmon Research
Type
article
Field-Weighted Citation Impact
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article

Graphene-Gated Control of Ag Nanowire Infrared Polaritons

Junbo Xu, Baoning Wang, Hongwei Jia, Kyoung‐Duck Park et al.
Nano Letters
Plasmonic and Surface Plasmon Research
article

Graphene-Gated Control of Ag Nanowire Infrared Polaritons

Junbo Xu, Baoning Wang, Hongwei Jia, Kyoung‐Duck Park, Di Huang, Markus B. Raschke, Yunfeng Pan, Tao Jiang, Zerui Wang, Quan Li, Zhanshan Wang, Zhenxing Wang, Xueqing Gao, Lei Zhou
article en

Abstract

Surface plasmon polaritons (SPPs) at dielectric-metal interfaces are of significant interest in nanophotonic devices owing to their unique field localization behaviors. Low-dimensional metal structures like metal nanowires generate strong SPP modes, yet dynamic SPP modulation, particularly in the mid-infrared (IR) range, is still underdeveloped, hindering progress in reconfigurable SPP-based devices. Here, we demonstrate active control of mid-IR SPPs in silver nanowires (AgNWs) through electric field gating, taking advantage of a graphene monolayer substrate and its gate-tunable dielectric properties in the mid-IR range. Through IR near-field nanoimaging and numerical simulations, we explore the resulting range of the spectral tuning behavior of the AgNW SPP response. Furthermore, we identify a new gate-dependent decay channel in which SPPs in AgNWs directly dissipate into graphene SPPs. Our findings highlight the potential for utilizing the electrical characteristics of graphene for manipulating SPPs in metal nanowires, paving the way for the development of advanced nanophotonic devices.

Nano LettersVol. 25(45)
ON Semiconductor (United States) (US), Tongji University (CN), Pohang University of Science and Technology (KR), Joint Institute for Laboratory Astrophysics (US), University of Colorado Boulder (US), Peking University (CN), University of Colorado System (US), Integrated Optoelectronics (Norway) (NO), Shanghai Institute of Optics and Fine Mechanics (CN), Institute of Semiconductor Physics (RU)
Openalex Percentile: Top 69%
Plasmonic and Surface Plasmon Research
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