info:eu-repo/semantics/masterThesis
Coherent microring perfect absorber
Autor
ENRIQUE SANCHEZ CRISTOBAL
Resumen
Time reversal symmetry is a basic concept in physics. It implies that if a particular physical process is allowed, then there also exist a “time reversed process” that is related to the original process by reversing momenta and the direction of certain fields. These symmetry operations are equivalent to change the sign of the time variable in the dynamical equations, and for the case of steady state they correspond to interchanging incoming and outgoing fields. Based on everyday life observations, time reversal symmetry does not seem too obvious in real life. It always seems that all events occur in one direction in time. For example a movie, whether you run it forward or backward, of two billiard balls colliding and moving off at different speeds and different directions is consistent with Newton’s laws. At least it would have time reversal symmetry if the friction between the billiard balls and the surface they are rolling on is negligible. The friction arises from process that cannot be reversed in time under typical experimental conditions. Thus friction breaks time reversal symmetry.
Materias
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