Abstract
In this article, a multi-beam double-cone interference method is used to design and experimentally observe complex periodic lattices. By adjusting the cone angle and tangential angle of the inner-cone beams, we can design double-period graded photonic superlattice and composite photonic lattices with different unit cells. At the same time, Fourier transforming patterns of photonic lattices are given to provide a deep understanding of the changes of the lattice structures. Finally, double-period graded photonic structures are observed by multi-fiber interference, which further verifies our theoretical assumption. This investigation provides a new idea to broaden the application of photonic structures in integrated optical devices.
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