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Tailoring simultaneous photonic and phononic band gaps

2009; American Institute of Physics; Volume: 106; Issue: 7 Linguagem: Inglês

10.1063/1.3243276

1520-8850

Said Sadat-Saleh, Sarah Benchabane, Fadi Baida, Maria-Pilar Bernal, Vincent Laude,

Photonic and Optical Devices

The simultaneous existence of photonic and phononic band gaps opens up many possibilities for enhancing acousto-optical interactions at a common wavelength scale. We term such structures phoxonic crystals. By computing the existence and dependence of phoxonic band gaps on the choice of lattice and unit cell, we obtain a hierarchy of two-dimensional phoxonic crystal structures. The single-atom hexagonal and square lattices, and some multiple-atom hexagonal lattices, including honeycomb and heterometric lattices, are investigated. For definiteness, arrays of air holes in lithium niobate are considered in the computations. It is observed that decreasing the symmetry of the lattice by adding atoms of different sizes inside the unit cell leads to larger phoxonic band gaps. Examples of designs for operation at an optical wavelength of 1550 nm are given. The corresponding phononic frequencies are in the gigahertz range.