Abstract

The optical constants of crystals of bismuth tellurium sulfide have been determined from reflectance measurements. Because it is a uniaxial crystal, two sets of optical constants are associated with it. One of these sets, denoted by (n_c, k_c), corresponding to the component of an E vector parallel to the symmetry axis (c axis) has been determined in the wavelength range 1–16.5 μm. The other set, denoted by (n_a, k_a), corresponding to the perpendicular component of an E vector, has been obtained in the range 0.2–16.5 μm. Two methods of analysis, the classical oscillator method and the Kramers–Kronig method, are used to obtain the (n_a, k_a) set, but the (n_c, k_c) set is obtained by using the classical oscillator method alone. A brief discussion on the uniqueness of the constants as obtained by a single method of analysis is presented.

© 1982 Optical Society of America

Optical constants of bismuth tellurium sulfide from ellipsometric data*

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