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基于连续域束缚态（Bound states In the Continuum，BIC）的全介质超表面因其具有超高品质因子（Quality factor，Q），能有效增强光与物质的相互作用，而被广泛应用于微纳生物传感领域。本文提出了一种基于BIC的矩形全介质双聚体超表面，并采用有限元方法进行仿真模拟以及使用时域耦合模进行理论分析。针对超表面中两长方对的角度、折射率、宽度和高度等参数，分别设计了4种系统破缺方式，均实现了对称保护型BIC（Symmetry-Protected BIC，SP-BIC）向准BIC（Quasi-BIC，QBIC）模式的转变，获得的最大Q因子高达1.75×104。引入相同的不对称参数后，4种调控方式下的超表面灵敏度几乎处于同一水平，而传感品质因数（Figure Of Merit，FOM）的差异可达103数量级。在同一调控方式下，当破缺参数绝对值相等时，正向破缺的超表面的灵敏度和FOM都高于负向破缺。经优化调节后，超表面的灵敏度和FOM分别达到了395 nm/RIU和3502 RIU-1，其综合性能指标已优于大部分现有研究。该超表面为生物、医疗领域的传感检测提供了有效手段，同时该研究为基于BIC的折射率传感器的设计提供了新思路。All-dielectric metasurfaces based on bound states in the continuum (BIC) are widely used in the field of micro-nano biosensors due to their ultra-high quality factor (Q), which can effectively enhance the interaction between light and matter. In this paper, a rectangular all-dielectric dimer metasurface based on BIC is proposed. The finite element method is used for simulation, and time-domain coupled mode theory is employed for theoretical analysis. For the parameters of the two rectangular components in the metasurface, such as their angles, refractive indices, widths, and heights, four different symmetry-breaking modes are designed (Fig. 1). All of these modes realize the transformation from symmetry-protected BIC (SP-BIC) to quasi-BIC (QBIC), with the maximum Q factor reaching 1.75×104 (Fig. 2). These four breaking methods cover the current common SP-BIC breaking methods and provide choices for device design. After introducing the same asymmetric parameters, the QBIC resonance excited by the metasurface under the four control modes is dominated by magnetic dipoles (Fig. 6). The sensitivity of the designed sensor device is almost at the same level, while the difference in figure of merit (FOM) can reach three orders of magnitude (Fig. 7). In addition, under the same control mode, the sensitivity and FOM of the metasurface with positive breaking are higher than those with negative breaking when the absolute values of the breaking parameters are equal (Fig. 8). After optimization and adjustment, the sensitivity and FOM of the metasurface reach 395 nm/RIU and 3502 RIU-1, respectively, and its comprehensive performance index is better than most existing studies (Table 1). The metasurface provides an effective means for sensing detection in the biological and medical fields. At the same time, this research provides a new idea for the design of refractive index sensors based on BIC.
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Keywords:
- all-dielectric metasurface /
- bound states in the continuum (BIC) /
- refractive index sensing /
- sensitivity
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