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Optical limiting in one-dimensional photonic bandgap material with a bulk nonlinear defect

A composite optical limiting configuration is proposed, which consists of a one-dimensional photonic bandgap structure and a thick bulk material. Using the backward split-step scheme, we studied the transmission and optical limiting properties of the composite structure. Results show that the performance of the optical limiting of the composite structure is better than that of the single bulk material and the optical limiting ability is improved by almost two orders of magnitude. The effects of the number of periods and the thickness of the bulk material on the nonlinear transmittance of this structure are studied. The contribution of nonlinear refraction and absorption to the composite optical limiting is also analyzed.