(单选题)3: 薄膜波导中的单模传输条件为 ( )
A: λ c (TE 0 )< λ 0 < λ c (TM 0 )
B: λc(TM 0 )< λ 0 < λc(TE 0 )
C: λc(TE 1 )< λ 0 < λc(TM 1 )
D: λc(TM 0 )< λ 0 < λc(TE 1 )
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