![]() The symbol h represents Planck’s constant and c, the speed of light in vacuum. Values of n and k as a function of photon energy, E, are referred to as the spectra of n and k, which can also be expressed as functions of wavelength of light, λ, since E = hc/λ. When used with a spectroscopic reflectometry tool, the Forouhi–Bloomer dispersion equations specify n and k for amorphous and crystalline materials as a function of photon energy E. The Forouhi–Bloomer dispersion equations describe how photons of varying energies interact with thin films. Subsequently, in 1991, their work was included as a chapter in “The Handbook of Optical Constants”. The 1986 publication relates to amorphous materials, while the 1988 publication relates to crystalline. Bloomer deduced dispersion equations for the refractive index, n, and extinction coefficient, k, which were published in 19. ![]()
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