We study controllable self-shifting Bloch modes in anisotropic hexagonal photonic lattices. The shifting results from a deformed band structure due to deformation of the index distribution in each unit cell. By reconfiguration of the index profile of the unit cell, the direction in which the Bloch modes move can be controlled. Our theoretical predictions are experimentally demonstrated in hexagonal lattices optically induced in an anisotropic nonlinear crystal.
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Article Synopsis
- Previous assumptions suggested that continuum bands could be easily connected to open-boundary spectra regardless of system size, but new findings show a more complicated relationship.
- As systems grow larger, the increase of complex eigenvalues occurs slowly and unevenly, leading to less overlap between continuum bands and open-boundary eigenvalues.
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