The electrical field or magnetic field and dielectric constant were expanded in the form of Fourier series which were substituted into the scalar wave equation.

• 将电场(或磁场)和介电常数以傅里叶级数展开并代入标量波动方程,获得了横电/磁波入射时一维电磁晶体的本征方程,求解得带隙结构。