Intensity Vector: Different Waves

This lecture covers the intensity vector for different waves, focusing on the Poynting theory and its connection to the parameters characterizing plane electromagnetic waves. It explains the behavior of intensity vectors for plane and Gaussian electromagnetic waves, discussing their orientation, distribution, and power transport. The lecture also delves into the concept of caustic in Gaussian beams, describing its shape, asymptotic behavior, and relation to divergence and focal waist. Additionally, it explores the intensity of spherical electromagnetic waves, emphasizing their radial orientation and decay. Formulas and mathematical expressions are used to illustrate the concepts.