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In this paper a simple and low-cost approach for designing a twin-core optical tweezer, that allows obtaining an all optical 3-D single-fiber tweezers, is presented. In this method that uses fiber-end drilling in a certain angle and coating all-reflective material around the fiber-end with a high refractive index, causes the total reflection of two beam cores at the interface of fiber and medium. Therefore, compared with other methods, it obviously improves the beam focusing on the particles. Simulation results show that it increases far-field distribution on 3-D particles trapping performance.