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现代光电子学(2)

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国家自然科学基金委员会<br />

数理学部实验物理讲习班<br />

k<br />

1<br />

= ( ω −ω<br />

)<br />

c<br />

2 2 2<br />

2<br />

p<br />

1. 当ω < ω p 时,k 2 < 0,k为一纯虚数。<br />

光场的透入深度为<br />

3. 等效介电常数<br />

2<br />

σ ω p<br />

εω= ε0 + i = ε0(1<br />

− ) 2<br />

ω ω<br />

δ<br />

=<br />

2<br />

c<br />

ω −ω<br />

2 2<br />

p<br />

2. 当ω > ω p时,k为实数,这是光场可以在其中传播<br />

当ω > ω p时<br />

n = εω/ ε0<br />

< 1

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