Abstract
We present models for the optical functions of 11 metals used as
mirrors and contacts in optoelectronic and optical devices: noble
metals (Ag, Au, Cu), aluminum, beryllium, and transition metals
(Cr, Ni, Pd, Pt, Ti, W). We used two simple phenomenological
models, the Lorentz–Drude (LD) and the Brendel–Bormann (BB),
to interpret both the free-electron and the interband parts of the
dielectric response of metals in a wide spectral range from 0.1 to 6
eV. Our results show that the BB model was needed to describe
appropriately the interband absorption in noble metals, while for Al,
Be, and the transition metals both models exhibit good agreement with
the experimental data. A comparison with measurements on surface
normal structures confirmed that the reflectance and the phase change
on reflection from semiconductor–metal interfaces (including the
case of metallic multilayers) can be accurately described by use of
the proposed models for the optical functions of metallic films and the
matrix method for multilayer calculations.
© 1998 Optical Society of America
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