The invention discloses a three-dimensional
crystal, a construction method thereof and an optical element, and belongs to the technical field of
semiconductor material preparation. The construction method of the three-dimensional
crystal comprises the following steps: S101, providing a two-dimensional material primitive structure with m
layers; s102, the two-dimensional
material element structure is
cut into a first part and a second part; s103, the first part and the second part are stacked, so that the number of
layers of the two-dimensional
material element structure is doubled; and S104, the step S102 and the step S103 are repeated at least once, the three-dimensional
crystal with the layer number of m * 2N is formed through N times of stacking operation, and m and N are positive integers larger than or equal to 1. According to the three-dimensional crystal, the construction method of the three-dimensional crystal and the optical element provided by the invention, the two-dimensional
material element structure is
cut and stacked by utilizing the physical characteristics of the two-dimensional material element structure, so that the number of
layers is increased exponentially in limited operation steps.