Angular dependence of the intensity of light beams diffracted by colloidal crystals

GABRIEL LOZANO, JAVIER E. MAZZAFERRI, LUIS A. DORADO, SILVIA LEDESMA, RICARDO A. DEPINE AND HERNÁN MÍGUEZ

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS

OPTICAL SOC AMER

Año: 2010 vol. 27 p. 1394 - 1399

0740-3224

An experimental and theoretical analysis of the angular dependence of the diffracted light beams emerging from three-dimensional colloidal photonic crystals is herein presented. Diffracted beams are identified according to their associated reciprocal-lattice vectors, and their intensities are obtained as a function of the zenithal and azimuthal incidence angles. Significant changes in the beam intensities are observed for large zenithal incidence angles as the azimuthal angle is varied. This phenomenon is related to the excitation of new resonant modes inside the photonic crystal which cannot be observed under normal incidence conditions. © 2010 Optical Society of America