本論文研究了一種由長方體對構成的二維無限週期結構，藉由破壞結構的對稱性來產生quasi-BIC現象。藉由兩種改變入射角度的方法，沿y-z平面或x-z平面變化，並觀察這四個共振模態對於入射角度變化的影響，結果顯示由quasi-BIC產生的共振在兩種變化入射角度的方法下皆有優異的角度容忍度，共振模態會因為彼此接近而產生影響。我們也利用了BIC的高品質因子特性進行折射係數感測的研究，結果可發現四個共振各自擁有不同的敏感度S最高達到275.3 nm RIU-1。Figure of merit (FOM)在特定的模態中能高達101386。

We numerically study a structure which possess quasi-BIC, vary the incident angle to observe angular responses and apply it to refractive index sensing.

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