Interference of electromagnetic waves in inhomogeneous dielectric media

摘要

Calculations are made of the plane‐wave reflection coefficient of a semi‐infinite inhomogeneous lossy dielectric medium with dielectric constant ϵ(z)=ϵ′(0)(1 + az)-iϵ″(0)(1 + bz), a, b ≥0, ϵ′(0)/ϵ0≥1.0, ϵ″(0)/ϵ0≥0. The reflection coefficient decreases to a minimum as a function of the parameter b for a given a, despite the increasing absolute value of ϵ(z). This phenomenon is a direct confirmation of the interference of coherent scattering reflections in the inhomogeneous medium with constant gradient ∇ϵ(z). Solutions are discussed in terms of Hankel and Airy integral functions.