使线偏振光变为圆偏振光——薄膜1/4波片的设计

Changing Linear Polorized Light into Circular Polorized Light-Design of Quarter-WaVe Thin-film

在一个折射率为N_2的基片上,镀制一层折射率为N_1=(N_0·N_2)^(12),厚度为d_1=λ/4(N_1~2-N_0~2Sin^2φ_0)^(-1/2)的透明介质薄膜,当一束波长为λ的线偏振光以特定的方位角α,在合适的入射角φ_0下,倾斜辐射到薄膜表面上时,可得到的反射光线为圆偏振光。

On a substrate with refractive index of N_2, a transparent medium thin-film,of which the refractive index is N_1=(N_0N_2)^(1/2) and the thickness is d_1= λ/4(N_1~2-N_0~2sin2ρ_0)^(1/2),is coated. When a beam of linear polarized light with a wavelength of λ illuminates the surface of that film at a special azimuth angle a and a proper incident angle ρ_0, the reflective light obtained will be circular polarized one.