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Design of tunable ferroelectric photonic structures

The IRG on ferroelectric nanophotonic materials and devices seeks to develop tunable photonic devices by combining the nonlinear dispersion of photonic metamaterials with the unusual optical properties of ferroelectric perovskites. A series of experimental tests and theoretical calculations have demonstrated the potential of this approach. The bottom figure shows how the refractive index of a ferroelectric thin film can be changed with applied electric field. The top right shows how light can be confined to a ferroelectric wave-guide the results of a theoretical calculation. The bottom right figures shows how the photonic band-edge of a hexagonal pattern (background) changes with refractive index and geometric parameters. Such band-edge maps are being used to select regions of great sensitivity.