Penetration Depth of Evanescent Wave · RMPH 2018 #B2.2

Physics · electromagnetism

Problem

Derive the mathematical expression of the distance Δz\Delta z from the interface at which the amplitude of the evanescent wave is ee times smaller than at the interface, as a function of the incident wavelength λ\lambda and calculate its numerical value. The first medium is glass (n1=1.6)(n_1 = 1.6), the second is air (n2=1.0)(n_2 = 1.0), and the incidence angle of light is θ1=40°\theta_1 = 40°.

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