Behaviour of transmittance and phase change on transmission with film thickness at intermediate thicknesses

✍ Scribed by L Ward

• Book ID: 104159546
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 343 KB
• Volume: 33
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(00)00108-0

✦ Synopsis

The behaviour of the optical functions T (transmittance) and Xt (phase change on transmission) for an absorbing ÿlm have been investigated as the ÿlm thickness was increased from a small fraction of a wavelength up to a thick solid. When plotted against thickness, the values of T oscillated at a frequency related to the quantity, x = 2 d= which is equal to the phase thickness divided by the refractive index. Ultimately, for real materials, the oscillations were damped to zero due to the absorption term in the complex dielectric constant of the ÿlm material. In the case of Xt, the most notable feature was the sudden phase changes of ± which occurred repeatedly as the thickness increased and the values of x at which this occurred could be related to the conditions for constructive or destructive interference between light rays coming from the top and bottom of the ÿlm.