Abstract
In this paper, we analyze the optical power transmission in structures
that include a low-index intermediate layer and sources with a wide angular
distribution. Special attention is paid to the angular average of the
transmission coefficient, which can be cast in a universal form for two
practically relevant classes of source layers. Due to the so-called
frustrated total internal reflection, the structure transparency is highly
sensitive to the intermediate layer thickness and index contrast. We show
that the transmission coefficient for isotropic radiation may remain low
even for optically thin low-index intermediate layers, so that the usual
comparison between the optical thickness and the wavelength is no longer a
reliable criterion. Calculations are presented for exemplary structures,
such as a semiconductor scintillator bonded to a photodiode. The angular
dependence of the transmission coefficient is shown to satisfy a simple and
universal sum rule.
© 2009 IEEE
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