The refractive index and extinction coefficient in infrared spectrum of the polycrystalline silicon films with different doped dosages, base on the inverse calculation, are obtained by means of utilizing the measured reflectance and transmittance of a layer of material and multilayer films, and the equations derived from photonics and electromagnetic theory. Extinction coefficients for proteins are determined at absorbance maxima near 280 nm. It means that no light has attenuation. The solid blue lines mark the values of the thermo-optic coefficient of silica and of stoichiometric silicon nitride reported in Ref. 2013: Thin film; n,k 0.252-1.25 µm The extinction coefficient ... wave length band of photovoltaic silicon solar cells. It is thus seen that the silicon dioxide film does not extinguish light at any wavelength considering the three analyzed spectra. A. Arbabi and L. L. Goddard, “ Measurements of the refractive indices and thermo-optic coefficients of Si_3N_4 and SIO_x using microring resonances,” Optics Letters 38, 3878– 3881 (2013). For example, the extinction coefficient of the thin film is neglected in this process . In the process of obtaining the refractive index equation in this model, some simplifications have been made. Protein analysis is needed to determine if a sample solution contains the desired protein. Figure 6: Extinction coefficient for layer vs. Wavelength. Optical constants of SiO 2 (Silicon dioxide, Silica, Quartz) Gao et al. Transmission Range : 0.18 to 2.2 μm (3 μm for IR grades) Refractive Index : 1.47012 at 4 μm (1) Reflection Loss : 7.0% at 0.4 μm (2 surfaces) Absorption Coefficient : For a wavelength, a null extinction coefficient implies in the absence of light extinction upon reaching the material. For example, measuring the absorbance of a protein sample at 280 nm with a spectrophotometer is … 15 15.
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