本文使用一种新型的8字形谐振器与金属-绝缘体-金属波导相耦合，用于设计等离子体滤波器和传感器。该谐振器支持两种共振模式，导致结构的透射光谱中出现峰值。观察到在1187.5 nm波长处的Q因子可达到270，为247.4。通过在谐振器中放置垂直和水平金属叶片，分别获得了两种可调谐的单模等离子体滤波器，分别对应第一和第二共振模式。使用有限差分时域（FDTD）方法研究了结构参数对透射光谱的影响。基于获得的结果，所提出的等离子体结构可用于生物传感应用，例如具有1200 nm/RIU的基底癌细胞检测灵敏度。重要的是，所提出结构的灵敏度和Q因子值都高于文献中报道的大多数近期传感器。因此，所提出的结构是滤波和传感应用的潜在有希望的候选者。© 2023. Springer Nature Limited.

In this paper, a novel 8-shaped resonator coupled to metal-insulator-metal waveguides is used for designing plasmonic filters and sensors. The resonator supports two resonance modes, which result in peaks in the transmission spectrum of the structure. A Q-factor of 247.4 which can reach up to 270 at the wavelength of 1187.5 nm is observed. By placing vertical and horizontal metal blades in the resonator, two tunable single-mode plasmonic filters are obtained at the first and second resonance modes, respectively. The effect of structural parameters on the transmission spectrum is investigated using the finite-difference time-domain (FDTD) method. Based on the obtained results, the proposed plasmonic structure can be used for biosensing applications such as the detection of basal cancer cells with a sensitivity of 1200 nm/RIU. It is of great significance that both the sensitivity and Q-factor values for the proposed structure are higher than most recent sensors reported in the literature. Therefore, the proposed structure is a potentially promising candidate for filtering and sensing applications.© 2023. Springer Nature Limited.