Steven G. Johnson is a prominent physicist and professor known for his work in the fields of applied physics, mathematics, and optics. He is a faculty member at the Massachusetts Institute of Technology (MIT) and has made significant contributions to the areas of photonics, wave phenomena, and computational methods in physics.
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A researcher and teacher whose work connects electromagnetic waves with mathematical and computational methods. His MIT course treats optical structures whose dimensions are comparable to a wavelength, using eigenvalue problems and Bloch's theorem to explain photonic crystals. Periodic changes in a material can exclude a range of optical frequencies, while a defect can localize light; this gives a physical reason to study both periodic structures and their imperfections.[ref]
Mathematical Methods in Nanophotonics, MIT 18.369, Spring 2016 by Steven G. Johnson. Overview; lectures 2 and 9–14: Maxwell eigenproblem, periodic media and defect modes