Scattering field enhanced biosensing based on sub-wavelength split-ring plasmonic cavity with high Q-factor

Xiao Jin; Lu Xue; Jichuan Xiong; Shengwei Ye; Weiqing Cheng; Lianping Hou; John Marsh; Bin Ni; Bin Xu; Xuefeng Liu

doi:10.1117/12.2647937

16 March 2023 Scattering field enhanced biosensing based on sub-wavelength split-ring plasmonic cavity with high Q-factor

Xiao Jin, Lu Xue, Jichuan Xiong, Shengwei Ye, Weiqing Cheng, Lianping Hou, John Marsh, Bin Ni, Bin Xu, Xuefeng Liu

Author Affiliations +

Proceedings Volume 12396, Plasmonics in Biology and Medicine XX; 1239607 (2023) https://doi.org/10.1117/12.2647937
Event: SPIE BiOS, 2023, San Francisco, California, United States

Abstract

Plasmonic structures are widely used in modern biosensor design. various plasmonic resonant cavities could efficiently achieve a high Q-factor, improving the local field intensity to enhance photoluminescence or SERS (Surface-Enhanced Raman Scattering) of small molecules. Also, the combination between virus-like particles and plasmonic structures could significantly influence the scattering spectrum and field, which is utilized as a method for biological particle detection. In this paper, we designed one kind of gold plasmonic cavity with the shape of a split-ring. An edge gap and a bonus center bulge are introduced in the split-ring structure. Our simulation is based on Finite Difference Time Domain (FDTD) method. Polarization Indirect Microscopic Imaging (PIMI) technique is used here to detect far-field mode distribution under the resonant wavelength. The simulation results demonstrate resonant peaks in the visible spectrum at about 600 nm with a Q-factor reaches to 74. Localized hot spots are generated by an edge dipole mode and a cavity hexapole mode at resonant wavelength, which is according to dark points in the PIMI sinδ image. Also, the split-ring cavity shows a sensitivity when combined with biological particles. The scattering distribution is evidently changed as a result of energy exchange between particles and split-ring cavity, indicating a promising possibility for biosensing.

Conference Presentation

Citation Download Citation

Xiao Jin, Lu Xue, Jichuan Xiong, Shengwei Ye, Weiqing Cheng, Lianping Hou, John Marsh, Bin Ni, Bin Xu, and Xuefeng Liu "Scattering field enhanced biosensing based on sub-wavelength split-ring plasmonic cavity with high Q-factor", Proc. SPIE 12396, Plasmonics in Biology and Medicine XX, 1239607 (16 March 2023); https://doi.org/10.1117/12.2647937

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