Optical BICs are investigated of a Si₃N₄ slab perforated with cross-shape nanohole array. BICs at normal incident angle and oblique incidence are both be found in this nanostructure by adjusting the nanohole shape and size and refractive index of the surrounding medium. Q-factor at at-Γ BIC and at off-Γ BIC can be more than 10⁶, which indicates light is confined in this nanostructure perfectly. High Q-factor modes containing BIC of this structure is associated with structure parameters and they are sensitive to the environment. The results from both methods accord each other well, and they have a certain significance for the design of novel ultra-high sensitivity.

研究了用十字形纳米孔阵列穿孔的 Si ₃ N ₄板的光学 BIC 。通过调整纳米孔的形状和尺寸以及周围介质的折射率，可以在这种纳米结构中发现法向入射角和斜入射的 BIC。Q因子在AT- Γ BIC和在摘Γ  BIC可超过10 ⁶，它表示光在该纳米结构被限制完美。包含该结构 BIC 的高 Q 因子模式与结构参数相关，并且它们对环境敏感。两种方法的结果相互吻合，对新型超高灵敏度的设计具有一定的意义。