  Using the monodromy method we calculate the asymptotic quasinormal (QN)
frequencies of an electromagnetic field moving in D-dimensional Schwarzschild
and Schwarzschild de Sitter (SdS) black holes ($D\geq 4$). For the
D-dimensional Schwarzschild anti-de Sitter (SadS) black hole we also compute
these frequencies with a similar method. Moreover, we calculate the
electromagnetic normal modes of the D-dimensional anti-de Sitter (AdS)
spacetime.
