  Most black hole solutions are characterized with asymptotically flat, or
asymptotically (anti) de-Sitter behaviors, but some black holes with unusual
asymptotics have also been constructed, which is believed to provide remarkable
insights into our understanding of the nature of gravity. In this paper,
focusing on a rotating black hole with unusual asymptotics in
Einstein-Maxwell-dilaton (EMD) theory, we innovatively analyze the photons'
trajectories around this black hole background, showing that the unusual
asymptotics has significant influences on the photons' trajectories. We expect
that our analysis could give more insights in the scenario of black holes'
shadow and image.
