Photonic Band Gap Alteration in LiNbO3-SiO2 Based 1D Periodic Multilayered Structure via Plate Wave

Abstract

Acoustic control on refractive index of periodic nanostructures facilitate a colocalize far-reaching control of light propagation. Static tuning of photonic band gap in lithium niobate and silicon dioxide based one dimensional superlattice through the GHz plate wave perturbation is reported. Acoustic field confinement in proposed structure produces field pattern of mechanical strain, analysed for fundamental symmetric plate mode within the elastic limit constraints of material. Contraction and rarefaction raises and lowers down the refractive index of material along the periodicity of structure. Using appropriate photo-elastic relations, the modified refractive index for both the materials of unit cell of periodic structure is estimated at different instants of perturbation. It is found that the refractive index contrast of unit cell gets altered with acoustic propagation and leads to photonic band gap modification. The available photonic band gap for transverse electric waves in both unperturbed and acoustically perturbed structure is calculated using Bloch’s theorem and transfer matrix method. © 2018, Springer Nature B.V.