• Advanced Photonics Nexus
  • Vol. 3, Issue 5, 056004 (2024)
Yaoran Zhang1,†, Hao Hu1, Francisco José García-Vidal2, Jingjing Zhang3..., Liangliang Liu1,*, Yu Luo1,4,* and Zhuo Li1,*|Show fewer author(s)
Author Affiliations
  • 1Nanjing University of Aeronautics and Astronautics, College of Electronic and Information Engineering, National Key Laboratory of Microwave Photonics, Nanjing, China
  • 2Universidad Autónoma de Madrid, Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center, Madrid, Spain
  • 3Southeast University, State Key Laboratory of Millimeter Waves, Nanjing, China
  • 4Nanyang Technological University, School of Electrical and Electronic Engineering, Singapore
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    DOI: 10.1117/1.APN.3.5.056004 Cite this Article Set citation alerts
    Yaoran Zhang, Hao Hu, Francisco José García-Vidal, Jingjing Zhang, Liangliang Liu, Yu Luo, Zhuo Li, "Reconfigurable exceptional point-based sensing with 0.001λ sensitivity using spoof localized surface plasmons," Adv. Photon. Nexus 3, 056004 (2024) Copy Citation Text show less

    Abstract

    Recent breakthroughs in the field of non-Hermitian physics present unprecedented opportunities, from fundamental theories to cutting-edge applications such as multimode lasers, unconventional wave transport, and high-performance sensors. The exceptional point, a spectral singularity widely existing in non-Hermitian systems, provides an indispensable route to enhance the sensitivity of optical detection. However, the exceptional point of the forementioned systems is set once the system is built or fabricated, and machining errors make it hard to reach such a state precisely. To this end, we develop a highly tunable and reconfigurable exceptional point system, i.e., a single spoof plasmonic resonator suspended above a substrate and coupled with two freestanding Rayleigh scatterers. Our design offers great flexibility to control exceptional point states, enabling us to dynamically reconfigure the exceptional point formed by various multipolar modes across a broadband frequency range. Specifically, we experimentally implement five distinct exceptional points by precisely manipulating the positions of two movable Rayleigh scatterers. In addition, the enhanced perturbation strength offers remarkable sensitivity enhancement for detecting deep-subwavelength particles with the minimum dimension down to 0.001λ (with λ to be the free-space wavelength).
    ΔωEP=ΔωDP1+Aj(2)εei2mjα,

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    ΔωEP=ΔωDPAj(2)εei2mjα=2Aj(2)εeimjα.

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    Yaoran Zhang, Hao Hu, Francisco José García-Vidal, Jingjing Zhang, Liangliang Liu, Yu Luo, Zhuo Li, "Reconfigurable exceptional point-based sensing with 0.001λ sensitivity using spoof localized surface plasmons," Adv. Photon. Nexus 3, 056004 (2024)
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