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3.4 Gelombang evanesenBerkas cahaya transmisi:Er rk2. = k2( z sin θ2+ x cos θ2)2∝i ( t k r2 .r− )eωn =2sinθ2n1sinθ1k =2sinθ2k1sinθ1Saat berlangsung refleksi total:22cosθ2= 1−(sinθ1/ sinθc) = −i (sinθ1/ sinθc) −1E 2zq=c2 1/ 2ik2 cosθ2= k2[(sinθ1/ sinθ) −1]>0xE2∝e− qx ( ω t ke i −z sin1 θ 1)qxe −5 −1n1 = 1.7, n2= 1.4, λ = 630 nm → q = 7.388 x10 m . Untuk qx = 1 → x = 1. 35μmE 2menjalar diperbatasan sepanjang sb-z, dengan amplitudo yang mengalamipengecilan eksponensial terhadap x. Gelombang ini disebut gelombangevanesen.28

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