The rigorous coupled - wave analysis technique for describing the diffraction of electromagnetic waves by periodic g rating structures is reviewed . numerical simulations show that at normal incidence , it is difficult to achieve high polarization extinction ratio which is reflected by the single - layer subwavelength metal or dielectric grating 本文用嚴(yán)格耦合波理論( rcwa )設(shè)計(jì)出一種垂直入射、可集成化的亞波長(zhǎng)金屬電介質(zhì)雙層光柵偏振片,該偏振片結(jié)構(gòu)小巧、可以用集成電路工藝制作等優(yōu)點(diǎn),對(duì)集成光學(xué)系統(tǒng)具有實(shí)用意義。