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This research is objected to design the grating structure for the purpose of efficient light delivery for the heat assisted magnetic recording (HAMR) system. The parameter study is firstly performed to determine the proper size of waveguide components and the topology optimization method is employed to design the grating structure. The formulation of the optimization problem is set to maximize the efficiency of the optical delivery. In the topology optimization result, the coupling efficiency is improved more than 20 times in comparison with the initial coupling efficiency and it is verified that the suggested optimization process can be applied to the grating structure design in the HAMR head effectively.