TITLE

Optical properties of AlxGa1-xN alloy

AUTHOR(S)
Takeuchi, Katsuki; Adachi, Sadao; Ohtsuka, Kohji
PUB. DATE
January 2010
SOURCE
Journal of Applied Physics;Jan2010, Vol. 107 Issue 2, p023306
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The optical response of the AlxGa1-xN alloy has been analyzed using a simplified model of interband transitions (E≤10 eV). The present model reveals distinct structures at energies of the E0, E1, F1, and E0′ critical points. The Cauchy-Lorentz expression popularly used for the modeling of the three-dimensional M0 and saddle-point excitonic transitions does not satisfy the Kramers-Krönig requirements but does so if its form is properly modified. As a result, excellent agreement is achieved between the experimental and calculated [variant_greek_epsilon](E) spectra over the entire range of photon energies. Dielectric-related optical constants, such as the complex refractive index, absorption coefficient, and normal-incidence reflectivity, of the AlxGa1-xN alloy are also presented. The high-frequency and static dielectric constants of the AlxGa1-xN alloy are determined to be [variant_greek_epsilon]∞(x)=5.27-1.07x and [variant_greek_epsilon]s(x)=9.28-1.45x, respectively.
ACCESSION #
47807225

 

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