旋光
E x − = E 0 cos  ( ω t − k 0 n − z ) E x + = E 0 cos  ( ω t − k 0 n + z ) E y − = − E 0 sin  ( ω t − k 0 n − z ) E y + = E 0 sin  ( ω t − k 0 n + z ) {\displaystyle {\begin{aligned}E_{x}^{-}&=E_{0}\cos {(\omega t-k_{0}n_{-}\mathrm {z} )}\\E_{x}^{+}&=E_{0}\cos {(\omega t-k_{0}n_{+}\mathrm {z} )}\\E_{y}^{-}&=-E_{0}\sin {(\omega t-k_{0}n_{-}\mathrm {z} )}\\E_{y}^{+}&=E_{0}\sin {(\omega t-k_{0}n_{+}\mathrm {z} )}\end{aligned}}}
と表せるから、合成電場のx成分 E x {\displaystyle \,E_{x}} 、y成分 E y {\displaystyle \,E_{y}} は