  Hawking radiation was originally proposed in astrophysics, but it has been
generalized and extended to other physical systems receiving the name of
analogue Hawking radiation. In the last two decades, several attempts have been
made to measure it in a laboratory, one of the most successful systems is in
optics. Light interacting in a dielectric material causes an analogue Hawking
effect, in fact, its stimulated version has already been detected and the
search for the spontaneous signal is currently ongoing. We briefly review the
general derivation of Hawking radiation, then we focus on the optical analogue
and present some novel numerical results. Finally, we call for a generalization
of the term Hawking radiation.
