E
Σ
=
E
1
+
E
2
=
E
0
sin
(
ω
t
−
k
z
)
+
E
0
sin
(
ω
t
−
k
z
+
δ
E
)
E
Σ
=
E
1
+
E
2
=
E
0
sin
(
ω
t
−
k
z
)
+
E
0
sin
(
ω
t
−
k
z
+
δ
E
)
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