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Antireflection coatings from analogy between electron scattering and spin precession
Sprung, Donald W. L.; Morozov, Gregory V.; Martorell Domenech, Juan
Universitat de Barcelona
We use the analogy between scattering of a wave from a potential, and the precession of a spin-half particle in a magnetic field, to gain insight into the design of an antireflection coating for electrons in a semiconductor superlattice. It is shown that the classic recipes derived for optics are generally not applicable due to the different dispersion law for electrons. Using the stability conditions we show that a Poisson distribution of impedance steps is a better approximation than is a Gaussian distribution. Examples are given of filters with average transmissivity exceeding 95% over an allowed band.
Electromagnetisme
Òptica
Electromagnetism
Optics
(c) American Institute of Physics, 2003
Article
American Institute of Physics
         

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