Improved refractive index formulas for the Al[sub x]Ga[sub 1-x]N and In[sub y]Ga[sub 1-y]N alloys

Laws, G. M.; Larkins, E. C.; Harrison, I.; Molloy, C.; Somerford, D.
January 2001
Journal of Applied Physics;1/15/2001, Vol. 89 Issue 2, p1108
Academic Journal
A detailed understanding of the nitride refractive indices is essential for the modeling and design of III-N laser structures. In this article, we report on the assessment of the refractive index data available for the nitride alloys and present formulas for evaluating the refractive indices for variations in both composition and photon energy. For Al[sub x]Ga[sub 1-x]N, an expression is given which fits well to experimental data below x<0.38, sufficient for the molefractions found in the cladding layers of III-N lasers. Due to the almost complete lack of experimental refractive index data for In[sub y]Ga[sub 1-y]N, we propose an expression to give a first-order approximation for the refractive index. © 2001 American Institute of Physics.


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