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Plasmon-Enhanced Infrared Absorption in Graphene Nanodot Array

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Abstract

Novel optical properties of the nanopatterned graphene in the infrared and terahertz can be enhanced and tailored. The underlying nature is the excited plasmon of the patterned graphene with sub-wavelength feature sizes induce high optical field confinement, low intrinsic loss, and diverse optical tunability. Thus, high-quality graphene nanoarrays with fine nanostructures and low surface roughness should be needed to precisely adjust the graphene plasmon-enhanced optical properties. Here, electron beam exposure and inductively coupled plasma (ICP) etching techniques were used to fabricate the single-layer graphene nanodot array (GNDA) with a minimum size of 90 nm and a surface roughness of 0.846 nm. The measured absorption spectra in the infrared and terahertz range show an enhanced absorption compared to the unpatterned graphene, and a maximum rate of 10% is adopted in the infrared spectra. The absorption peaks undergo a slight red shift with the dot size increase. The experimental results show a good agreement with the numerical simulation. The results in our work provide a path to design and fabrication of novel photodetectors based on graphene’s plasmonic excitations with good light sensitivity and frequency selectivity.

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Data Availability

The datasets generated during the current study are not publicly available due to inconvenient documents to organize but are available from the corresponding author on reasonable request.

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Funding

This work was partially supported by Sichuan Science and Technology Program (Grant No. 2023YFH0089) and State Grid Science and Technology Project “Research on broadband electromagnetic measurement technology based on spectral characteristics of Rydberg atoms and Tunnel Magneto Resistance effect” (No. 5700-202127198A-0-0-00).

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Authors and Affiliations

  1. Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001, China

    Ruotong Chen, Yucheng Wang, Ziang Liu & Xiaoping Huang

  2. School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu, 61731, China

    Ruotong Chen, Fengjiang Peng, Zilong Yan, Zhenyuan Yang, Shizheng Chen, Zhu Chang, Yucheng Wang, Ziang Liu & Xiaoping Huang

Authors
  1. Ruotong Chen
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  2. Fengjiang Peng
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  3. Zilong Yan
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  9. Xiaoping Huang
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Zilong Yan, Fengjiang Peng, Ruotong Chen, and Xiaoping Huang. The first draft of the manuscript was written by Ruotong Chen and Zilong Yan. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Xiaoping Huang.

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Chen, R., Peng, F., Yan, Z. et al. Plasmon-Enhanced Infrared Absorption in Graphene Nanodot Array. Plasmonics 18, 2205–2212 (2023). https://doi.org/10.1007/s11468-023-01939-1

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