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In this paper, we study the influence of the axion-plasmon, as proposed in(Phys. Rev. Lett. 120, 181803 (2018)) on the optical properties of theSchwarzschild black hole. Our aim is to provide a test to detect the effects ofa fixed axion background using black holes. To accomplish our goal, we explorethe effect of the axion-plasmon coupling on the motion of photons around theSchwarzschild black hole and check the possibility of observing those effectsupon the black hole shadow, the gravitational deflection angle, Einstein ringsand shadow images obtained by radially infalling gas on a black hole within aplasma medium. We find that these quantities are indeed affected by theaxion-plasmon coupling parameters which consequently generalize some of thewell-known results in the literature. It is shown that the size of the blackhole shadow decreases with increasing axion-plasmon if observed fromsufficiently large distance.

Axion-plasmon or magnetized plasma effect on an observable shadow and gravitational lensing of a Schwarzschild black hole