We propose the grating systems composed of anisotropic material and study the tunability of such anisotropy to the evolutions of bound states in the continuum (BICs) and leaky mode. as well as the band flip between odd- and even-mode. The dependence of band transitions on the permittivity anisotropy is given in the single-layer grating lattice. By further introducing the freedom of in... https://danddcollectiblers.shop/product-category/parasites/