Section: 12 | Optical Properties of Selected Elements |

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The table 'Table 2. Refractive Index n, Extinction Coefficient k, and Normal Incidence Reflection R as a Function of Energy' has one or more different columns and 3939 more rows than appear in the book.

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OPTICAL PROPERTIES OF SELECTED ELEMENTS

J. H. Weaver and H. P. R. Frederikse

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:

Optical Properties of Metals (OPM), Volumes I and II, Physics Data, Nr. 18-1 and 18-2, J. H. Weaver, C. Krafka, D. W. Lynch, and E. E. Koch, Fachinformationzentrum, Karlsruhe, Germany.
Handbook of Optical Constants (HOC), Vol. I, 1985, and Vol. II, 1991. E. D. Palik, Ed., Academic Press, Inc., London.
American Institute of Physics Handbook (AIPH), 3rd Edition, D. E. Gray, Ed., McGraw-Hill, New York, 1972.

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.

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Table 1. Relation between Energy and Wavelength

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

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Table 2. Refractive Index n, Extinction Coefficient k, and Normal Incidence Reflection R as a Function of Energy

Form	Energy (eV)	n	k	R(φ = 0)
Continued on next page...
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

^aInterpolated or extrapolated.

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OPTICAL PROPERTIES OF SELECTED ELEMENTS

Table 1. Relation between Energy and Wavelength

Table 2. Refractive Index n, Extinction Coefficient k, and Normal Incidence Reflection R as a Function of Energy

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