This video explains the basic principle of ellipsometry in a simple way based on 3D animations. In this video, optical constants, light polarization, light reflection, and the fundamental principle of ellipsometry are explained. For further reference, you can refer to a book of "Spectroscopic Ellipsometry: Principles and Applications" by Hiroyuki Fujiwara (Wiley, 2007):
https://www.wiley.com/en-us/Spectroscopic+Ellipsometry%3A+Principles+and+Applications-p-9780470016084
0:00 Introduction
0:35 Optical constants
2:39 Polarization of light
4:30 Light reflection
5:21 Ellipsometry
