中国物理B ›› 2023, Vol. 32 ›› Issue (11): 110204-110204.doi: 10.1088/1674-1056/acfaf4

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Optical anapole modes in hybrid metal-dielectric nanoantenna for near-field enhancement and optical sensing

Debao Wang(王德宝)1, Jingwei Lv(吕靖薇)1,†, Wei Liu(刘伟)1, Yanru Ren(任艳茹)1, Wei Li(李薇)1, Xinchen Xu(许鑫辰)1, Chao Liu(刘超)1, and Paul K Chu(朱剑豪)2   

  1. 1 School of Physics and Electronic Engineering, Northeast Petroleum University, Daqing 163318, China;
    2 Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China
  • 收稿日期:2023-06-25 修回日期:2023-09-15 接受日期:2023-09-19 出版日期:2023-10-16 发布日期:2023-10-16
  • 通讯作者: Jingwei Lv E-mail:lvjingwei2009123@126.com
  • 基金资助:
    Project supported by the Outstanding young and middleaged research and innovation team of Northeast Petroleum University (Grant No. KYCXTD201801), the Natural Science Foundation Projects of Heilongjiang Province of China (Grant No. LH2021F007), the China Postdoctoral Science Foundation (Grant No. 2020M670881), the Study Abroad returnees merit-based Aid Foundation of Heilongjiang Province of China (Grant No. 070-719900103), the Northeastern University scientific research projects (Grant No. 2019KQ74), the City University of Hong Kong Donation Research (Grant Nos. 9220061 and DON-RMG 9229021), and the City University of Hong Kong Strategic Research (Grant No. SRG 7005505).

Optical anapole modes in hybrid metal-dielectric nanoantenna for near-field enhancement and optical sensing

Debao Wang(王德宝)1, Jingwei Lv(吕靖薇)1,†, Wei Liu(刘伟)1, Yanru Ren(任艳茹)1, Wei Li(李薇)1, Xinchen Xu(许鑫辰)1, Chao Liu(刘超)1, and Paul K Chu(朱剑豪)2   

  1. 1 School of Physics and Electronic Engineering, Northeast Petroleum University, Daqing 163318, China;
    2 Department of Physics, Department of Materials Science and Engineering, and Department of Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China
  • Received:2023-06-25 Revised:2023-09-15 Accepted:2023-09-19 Online:2023-10-16 Published:2023-10-16
  • Contact: Jingwei Lv E-mail:lvjingwei2009123@126.com
  • Supported by:
    Project supported by the Outstanding young and middleaged research and innovation team of Northeast Petroleum University (Grant No. KYCXTD201801), the Natural Science Foundation Projects of Heilongjiang Province of China (Grant No. LH2021F007), the China Postdoctoral Science Foundation (Grant No. 2020M670881), the Study Abroad returnees merit-based Aid Foundation of Heilongjiang Province of China (Grant No. 070-719900103), the Northeastern University scientific research projects (Grant No. 2019KQ74), the City University of Hong Kong Donation Research (Grant Nos. 9220061 and DON-RMG 9229021), and the City University of Hong Kong Strategic Research (Grant No. SRG 7005505).

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摘要： Metal-dielectric nanostructures in the optical anapole modes are essential for light-matter interactions due to the low material loss and high near-field enhancement. Herein, a hybrid metal-dielectric nanoantenna composed of six wedge-shaped gold (Au) nanoblocks as well as silica (SiO2) and silicon (Si) nanodiscs is designed and analyzed by the finite element method (FEM). The nanoantenna exhibits flexibility in excitation and manipulation of the anapole mode through the strong coupling between the metal and dielectrics, consequently improving the near-field enhancement at the gap. By systematically optimizing the structural parameters, the electric field enhancement factors at wavelengths corresponding to the anapole modes (AM1 and AM2) can be increased to 518 and 1482, respectively. Moreover, the nanoantenna delivers great performance in optical sensing such as a sensitivity of 550 nm/RIU. The results provide guidance and insights into enhancing the coupling between metals and dielectrics for applications such as surface-enhanced Raman scattering and optical sensing.

关键词: light-matter interaction, metal-dielectric nanoantenna, anapole mode, electric field enhancement, optical sensing

Abstract: Metal-dielectric nanostructures in the optical anapole modes are essential for light-matter interactions due to the low material loss and high near-field enhancement. Herein, a hybrid metal-dielectric nanoantenna composed of six wedge-shaped gold (Au) nanoblocks as well as silica (SiO2) and silicon (Si) nanodiscs is designed and analyzed by the finite element method (FEM). The nanoantenna exhibits flexibility in excitation and manipulation of the anapole mode through the strong coupling between the metal and dielectrics, consequently improving the near-field enhancement at the gap. By systematically optimizing the structural parameters, the electric field enhancement factors at wavelengths corresponding to the anapole modes (AM1 and AM2) can be increased to 518 and 1482, respectively. Moreover, the nanoantenna delivers great performance in optical sensing such as a sensitivity of 550 nm/RIU. The results provide guidance and insights into enhancing the coupling between metals and dielectrics for applications such as surface-enhanced Raman scattering and optical sensing.

Key words: light-matter interaction, metal-dielectric nanoantenna, anapole mode, electric field enhancement, optical sensing

中图分类号:  (Finite-element and Galerkin methods)

  • 02.70.Dh
62.23.St (Complex nanostructures, including patterned or assembled structures) 94.20.Ss (Electric fields; current system) 07.07.Df (Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)