k叶对频率有 aD ioCOE+ d(o8(0))oE at do at k代入可滴去-ioE(o)E项 (E.D2+E2.D d(os(o) at at do at (E·E) k凤理求得磁场 Ⅲ耗散与场能的求解 即对频率有 𝜕𝐷 𝜕𝑡 = −𝑖  𝐸 + 𝑑 () 𝑑 𝜕𝐸 𝜕𝑡  代入可消去−𝒊  𝑬项 𝐸 ∙ 𝜕𝐷 ∗ 𝜕𝑡 + 𝐸 ∗ ∙ 𝜕𝐷 𝜕𝑡 = 𝑑   𝑑 𝜕 𝜕𝑡 (𝐸 ∙ 𝐸 ∗ )  同理求得磁场。 Ⅲ 耗散与场能的求解