We propose a new technique for detecting gravitational waves that rests on Weber-like setup plus a specially arranged double slit experiment in which we suggest to make distance between the slits as much small as possible with present state of the technology. We make these two slits in the Weber bar itself, equidistant from center of thin Weber bar, to be suspended along y-axis and kept in the y-z plane and suppose the gravitational waves will be falling perpendicularly on this suspended Weber bar having specially made two slits near the center as mentioned along x-direction. This technique is based on detecting oscillations produced in the fringe pattern formed due to interference between light waves passing through two slits made in the suspended Weber bar due to squeezing and elongation of this antenna leading to variation in the distance between the slits made in this antenna when this antenna will get exposed to incoming gravitational waves, in the x-direction. Let the separation between slits be d say. When plane gravitational waves will be passing this apparatus by falling perpendicularly on y-z plane there will be switching of direction of elongation and contraction periodically in such a way that there will be elongation along y-direction and contraction along z-direction and then the reversal of these conditions, i.e. there will be contraction along y-direction and elongation along z-direction. Due to this the separation between these parallel slits will be changing periodically. This variation will essentially amount to variation in the fringe pattern. If this variation that is expected in the fringe pattern could be found then it will conclude the arrival and passing of gravitational waves!