New Method of Evaluation.pdfVIP

Optical/Dielectric Properties of Inhomogeneous Materials: A New Method of Evaluation by C.L. Nagendra* and James L. Lamb Center for Space Microelectronics Technology Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena, CA 91109 ABSTRACT A new method, based on Effective Mean Field Theory, is proposed for the evaluation of the optical/dielectric properties of inhomogeneous materials, in which the real and imaginary parts of the dielectric function are determined by solving a simultaneous non-linear equation. It is seen that the method yields precise and unambiguous results and can be applied to any type of inhomogeneous material. Key words: optical, Dielectric, Inhomogeneous, Effective Mean Field Theory, Composite Films. * Indian Space Research Organization (ISRO), ISRO Satellite Center, Airport Road, Vimanapura, Banpalore-560017, India 1 1. Introduction: The optical/dielectric properties of materials can be modified by mixing two or more materials in different proportions.’-3 The constituent materials can be metals, semiconductors and insulators which may be either in solid”2 or liquid3 form. One of the effective ways of producing inhomogeneous materials in the solid state is by co-evaporation or sputtering of the constituent materials which has been widely investigated.4”6 These materials have useful applications, as solar absorbers.7 The optical/dielectric properties of liquids can be altered by mixing different proportions of metallic particles i