These tables list the index of refraction n, the extinction coefficient k, and the normal incidence reflection R (φ = 0) as a function of photon energy E, which is expressed in electron volts (eV). To convert the energy in eV to the wavelength in μm, use λ = 1.2398/E. To compute the dielectric function ε̃ = ε1 + iε2 from the complex index of refraction Ñ = n + ik, use ε1 = n2 – k2 and ε2 = 2nk.
The symbol E indicates the electric field vector of the incident light, which may be either parallel or perpendicular to the unit vector perpendicular to the crystal face.
The optical constants in these tables are abridged from three more extensive tabulations:
The first two of these major sources provide detailed comparisons of all optical data available in the literature at the time of the compilation. For critical applications the reader should refer to the original work. References for individual metals and semiconductors are listed at the end of the tables. Generally, tabulated values for the optical properties are accurate to better than 10%. Extrapolated or interpolated values are marked with a footnote a. For most elements the spectral range covered is from the far infrared (0.010 or 0.10 eV) to the far ultraviolet (10, 30, or 300 eV). The intervals between successive energies in the tables are chosen in such a way that the major spectral features are preserved.
Very small values of k are expressed in exponential notation, e.g., 1.23E-5 means 1.23 × 10-5.
The following table is convenient for associating the energy entries in these tables with the corresponding wavelengths.
λ | E/eV |
1 mm | 0.00124 |
500 μm | 0.00248 |
100 μm | 0.01240 |
50 μm | 0.02480 |
10 μm | 0.12398 |
5 μm | 0.24797 |
1 μm | 1.240 |
700 nm | 1.771 |
600 nm | 2.066 |
500 nm | 2.480 |
400 nm | 3.100 |
300 nm | 4.133 |
200 nm | 6.199 |
100 nm | 12.398 |
50 nm | 24.797 |
Form | Energy (eV) | n | k | R(φ = 0) |
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Aluminum1 | ||||
Al | 0.040 | 98.595 | 203.701 | 0.9923 |
Al | 0.050 | 74.997 | 172.199 | 0.9915 |
Al | 0.060 | 62.852 | 150.799 | 0.9906 |
Al | 0.070 | 53.790 | 135.500 | 0.9899 |
Al | 0.080 | 45.784 | 123.734 | 0.9895 |
Al | 0.090 | 39.651 | 114.102 | 0.9892 |
Al | 0.100 | 34.464 | 105.600 | 0.9889 |
Al | 0.125 | 24.965 | 89.250 | 0.9884 |
Al | 0.150 | 18.572 | 76.960 | 0.9882 |
Al | 0.175 | 14.274 | 66.930 | 0.9879 |
Al | 0.200 | 11.733 | 59.370 | 0.9873 |
Al | 0.250 | 8.586 | 48.235 | 0.9858 |
Al | 0.300 | 6.759 | 40.960 | 0.9844 |
Al | 0.350 | 5.438 | 35.599 | 0.9834 |
Al | 0.400 | 4.454 | 31.485 | 0.9826 |
Al | 0.500 | 3.072 | 25.581 | 0.9817 |
Al | 0.600 | 2.273 | 21.403 | 0.9806 |
Al | 0.700 | 1.770 | 18.328 | 0.9794 |
Al | 0.800 | 1.444 | 15.955 | 0.9778 |
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