Angular Spectrum and Evanescent Waves

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What happens when we have really high frequencies present in our angular spectrum? (Higher than the frequency of the illuminating plane wave). This video explores the propagation of evanescent waves, and what happens to very high-frequency components of the input pattern as they propagate through space. This effectively forms an upper bound on the spatial frequencies that can be 'remembered' by an optical system, and this is one explanation for the resolution of an optical system.

This is part of my graduate series on optoelectronics / photonics, and is based primarily on Coldren's book on Lasers as well as graduate-level coursework I have taken in the EECS department at UC Berkeley.

Hope you found this video helpful, please post in the comments below anything I can do to improve future videos, or suggestions you have for future videos.