|approved||extended.pdf||2015-04-04 16:26:58||Luis Mochan|
Author: Luis Mochan
Requested Type: Oral
Submitted: 2015-03-11 14:17:29
Co-authors: Bernardo S. Mendoza, José Samuel Pérez-Huerta, Guillermo Ortiz
Apartado Postal 48-3
Cuernavaca, Morelos 62251
We develop a representation of the microscopic linear response of a binary nanostructured periodic composite material that allows an efficient calculation of the macroscopic response and the microscopic electric field for an arbitrary geometry, composition and frequency. Knowledge of the linear fields allows us to calculate interface dipolar and bulk quadrupolar contributions to three wave mixing processes such as second harmonic generation (SHG). The non-linear macroscopic response is of a quadrupolar character when the materials themselves and the geometry of the inclusions is centrosymmetric. Nevertheless, when the geometry of the inclusions lacks a center of symmetry, the non-linear response is enhanced and acquires a dipolar nature even when the individual materials are centrosymmetric. This suggests a strategy to obtain a large SHG signal from ordinary materials.