Apparent causality paradox in frustrated Gires-Tournois interferometers.
Negative group delay times upon total reflection from frustrated Gires-Tournois interferometers seem to violate causality. Contrary to what has been recently argued in the literature, I show with the example of total light reflection upon an ideal nonabsorbing plasma that adding the time associated with the Goos-Hänchen shift does not solve the paradox, which remains open.
Tournois
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Fastlite, Campus de l'Ecole Polytechnique, 91128 Palaiseau, France. tournois@fastlite.com