Periodic modulation on the refractive index in a Bi12TiO20 crystal by M. P. Sampedro, M. A. Cerezo Jácome, D. Ramírez Martínez, M. Méndez Otero, and M. Palomino Ovando

Crystal Research and Technology

Cryst. Res. Technol. 41, 683 (2006) - Abstract -

Periodic modulation on the refractive index in a Bi₁₂TiO₂₀ crystal

M. P. Sampedro, M. A. Cerezo Jácome*, D. Ramírez Martínez, M. Méndez Otero, and M. Palomino Ovando

Facultad de Ciencias Físico Matemáticas. Posgrado en Optoelectrónica Benemérita Universidad Autónoma de Puebla, Puebla 72000, México
*Facultad de Ciencias de le Electrónica Benemérita Universidad Autónoma de Puebla, PO Box 1152, Puebla 72000, México

Keywords	photorefractive effect, photonic band gap materials
PACS	42.55.Tv, 42.65.Hw
DOI	10.1002/crat.200510649

It is, well know that some, optical materials to change his refractive index when these exposed to light, depending on particular conditions, they can generate several distributions of refractive index. In this work, an experimental periodic arrangement of refractive index generated on the Bi₁₂TiO₂₀ photorrefractive crystal is presented, the initial condition used was generated by superposing two He-Ne laser linearly polarized beams in a perpendicular direction to the external field applied to the crystal at 632.8 nm. The diagrams of bands generated with this arrangement is studied, based on the similarities presented by the periodic refractive index with the photonic bandgap (PBG) diagrams one-dimensional superlattices composed of alternating layers of two distinct materials.

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