William Angerer - Department of Physics and Astronomy - University ...

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generaL the time averaged value of the Poynting vector is
s = 8: Real(EH")k (0.19)
where k is a unit vector in the direction of the net propagation of the fields.
At
boundary b. the time averaged Poynting vector, is
(0.20)
where E2 is the total electric field in the substrate and U2 is the energy flux transmitted
into region 2 per unit time. Similarly, the Poynting vector at boundary a is
Sa = 8: Real(BC")Eik = (1 - R)uok (0.21)
where Uo is the incident energy flux per unit time in region 0 transmitted through
boundary a. Therefore, the transmission coefficient of the thin film is
T = U2 = 172(1 - R) .
Uo Real(BC")
(0.22)
Equation (0.22) can be rewritten using equation (0.18) and R = rr' as
where
T = 172 tt' (0.23)
110
2110
t=
TJoB + C
(0.2-1)
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