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Multilayer dielectrics between a dielectric substrate and a reflecting metal film enhance internal substrate-to-metal reflectance. The most common application is for an aluminum film on a glass substrate.
English (United States)
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54% of the total text.
Multilayer dielectrics between a dielectric substrate and a reflecting metal
film enhance internal substrate-to-metal reflectance. The most common
application is for an aluminum film on a glass substrate.
Multiple dielectric layers over aluminum on a front-surfaced mirror enhance
the air-aluminum interface reflectance from about 90% to about 99%. Mirrors
back-surfaced with aluminum, by itself, exhibit a glass-aluminum reflectance of
about 86.5%. Several configurations for multiple dielectric layers sandwiched
between glass and aluminum provide a range of enhanced reflectance selectably
based on a trade-off of improvement against cost. For example, the following
table illustrates reflectance for several possible interface layer configurations
between glass, having a refractive index of 1.6, and aluminum: See Original.
These are specific embodiments of the general configurations:
1) Glass - (HL)/M/ - Aluminum
2) Glass - (LHL)/M/ - Aluminum.
where H is a high index material, L a low index material, and M
indicates repetitions. As M increases, the peak reflectance
increases, but the spectral width around Lambda c becomes narrower,
as shown in Fig. 1, where R is the relative magnitude of reflectance.
Some numeric data for typical coatings for Lambda of 5900 Angstroms
where the layer thicknesses are Lambda/4 optical thickness (e.g.,
MgF(2) = 1000 A and TiO(2) = 600 Angstroms) are shown in the
following table: See Original.
where n and k are the real and imaginary parts o...