abstract

• Refractive indices n and absorption coefficients α of epitaxial metastable zincblende structure β-GaN(001) were determined over the subband-gap energy range between 0.8-3.1 eV from an analysis of optical transmission spectra. n was found to vary from 2.25 to 0.8 eV (1.55 μm) to 2.50 at 3.1 eV (0.4 μm) with an energy E (eV) dependence that is well described by a Sellmeir-type dispersion relationship, n2(E)=1%2b148/ (38.3-E2). The refractive indices of β-GaN are 3%25-4%25 smaller than previously reported values for hexagonal α-GaN. © 1995 American Institute of Physics.

authors

• Greene J.E.
• Lastras Martínez Alfonso
• Navarro Contreras Hugo Ricardo
• Powell R.C.
• Ramírez Flores Gustavo
• Vidal Borbolla Miguel Angel

publication date

• 1995-01-01

published in

• Applied Physics Letters  Journal

Digital Object Identifier (DOI)

• 10.1063/1.116406

start page

• 19

end page