Refractive index as a function of photon energy for AlGaAs between 1.2 and 1.8 eV

Articles you may be interested inAnalytical modeling and numerical simulation of P+-Hg0.69 Cd0.31Te/n-Hg0.78Cd0.22Te/CdZnTe heterojunction photodetector for a long-wavelength infrared free space optical communication systemThe optical constants of Hg x Cd 1Ϫx Te as a function of energy and composition x are modeled over a wide spectral range from 1.5 to 6 eV. The model employed represents an extension of Adachi's model and incorporates the adjustable broadening function rather than the conventional Lorentzian one. In this way, greater flexibility of the model is achieved, enabling us to obtain an excellent agreement with the experimental data. The relative rms errors obtained for all compositions are below 2.5% for the real part and below 6% for the imaginary part of the index of refraction. The lowest rms errors are obtained for xϭ0 ͑0.6% for the real part and 0.7% for the imaginary part of the index of refraction͒, and the highest for the xϭ0.91 ͑2.4% for the real part and 5.8% for the imaginary part͒.

Section: Introductionmentioning

confidence: 99%

Modeling the optical constants of HgxCd1−xTe alloys in the 1.5–6.0 eV range

Djurišić¹,

Li²

1999

“…However, Adachi's model is not very accurate, and several modifications have been proposed recently. 3,[23][24][25][26][27][28]34 Jenkins 24 has obtained better agreement with the experimental data by introducing an exponential decay of matrix elements which are taken to be constant over the Brillouin zone in Adachi's model. Nonetheless, this model gives good agreement with the experi-mental data only in the narrow range, and for AlAs, the calculated values differ from the experimental ones for a constant amount below 3 eV.…”

Section: Introductionmentioning

confidence: 77%

Modeling the optical constants of AlxGa1−xAs alloys

Djurišić

Rakić

Kwok

et al. 1999

The extension of Adachi’s model with a Gaussian-like broadening function, in place of Lorentzian, is used to model the optical dielectric function of the alloy AlxGa1−xAs. Gaussian-like broadening is accomplished by replacing the damping constant in the Lorentzian line shape with a frequency dependent expression. In this way, the comparative simplicity of the analytic formulas of the model is preserved, while the accuracy becomes comparable to that of more intricate models, and/or models with significantly more parameters. The employed model accurately describes the optical dielectric function in the spectral range from 1.5 to 6.0 eV within the entire alloy composition range. The relative rms error obtained for the refractive index is below 2.2% for all compositions.

“…[9][10][11][12][13][14][15][16][17][18] Forouhi and Bloomer 19 have proposed a model which is also related to the band structure and requires fewer parameters ͑up to 14͒. However, for the materials investigated here, this model does not bring about significant improvement in accuracy over the conventional Adachi's model, especially around the fundamental band-gap E 0 .…”

Section: Introductionmentioning

confidence: 79%

Modeling the optical constants of GaP, InP, and InAs

Djurišić¹,

Rakić

Kwok³

et al. 1999

An extension of the Adachi model with the adjustable broadening function, instead of the Lorentzian one, is employed to model the optical constants of GaP, InP, and InAs. Adjustable broadening is modeled by replacing the damping constant with the frequency-dependent expression. The improved flexibility of the model enables achieving an excellent agreement with the experimental data. The relative rms errors obtained for the refractive index equal 1.2% for GaP, 1.0% for InP, and 1.6% for InAs.