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When a gravitational wave or a graviton travels through an electric ormagnetic background, it could convert into a photon with some probability. Inthis paper, a dipole magnetic field is considered as this kind of background inboth the Minkowski spacetime and the curved spacetime in the near-zone of aneutron star. In the former case, we find that the graviton travelingvertically rather than parallel to the background magnetic field could be moreeffectively converted into an electromagnetic radiation field. In the lattercase, we focus on the situation, in which the graviton travels along the radialdirection near a neutron star. The radius of a neutron star is about tenkilometers, so the gravitational wave with long wavelength or low frequency maybypass neutron stars by diffraction. For high frequency gravitational wave, theconversion probability is proportional to the distance square as that in thestatic electric or magnetic background case. The smaller the inclination anglebetween the dipole field and the neutron star north pole is, the largermagnetic amplitude will be. The term that described curved spacetime willslightly enhance this kind of probability. We estimate that this value is aboutthe order of $\sim 10^{-14}- 10^{-10}$. Therefore, it is expectable that thiskind of conversion process may have a potential to open a window for observinghigh frequency gravitational waves.

Photons generated by gravitional waves in the near-zone of a neutron star