Volume 76, Number 6, December 2006
|Page(s)||1123 - 1129|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||16 November 2006|
Effect of local rotations on the optical response of : Application to ion-beam damage
Centro de Microanálisis de Materiales (CMAM), Universidad Autónoma de Madrid (UAM) - Cantoblanco, 28049 Madrid, Spain
2 Instituto de Óptica, CSIC - c/ Serrano 121, 28006 Madrid, Spain
3 Departamento de Física de Materiales, Universidad Autónoma de Madrid (UAM) Cantoblanco, 28049 Madrid, Spain
4 Instituto de Ciencia de Materiales (ICMM), CSIC - Cantoblanco 28049 Madrid, Spain
Accepted: 17 October 2006
The effect of local rigid rotations of the structure on the optical response has been theoretically explored and compared to experimental data obtained after irradiation with F (20–22), O (20) and Mg (39) ions. The calculations account for the main trends of the ordinary and extraordinary refractive indices measured after the initial stage of irradiation, namely, decrease in birrefringence and approximate invariance of the average refractive index. Moreover, experimental data are quantitatively consistent with a distribution function for the rotation angle with respect to the trigonal (Z-axis) and isotropic azimuthal angle ϕ. The corresponding angle is in the range 4.6– depending on ion and energy (stopping power). The model also predicts a significant reduction in second-harmonic generation (SHG) yield with fluence, comparable although somewhat lower than found by experiment.
PACS: 61.80.Az – Theory and models of radiation effects / 61.80.Jh – Ion radiation effects / 78.20.Ci – Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
© EDP Sciences, 2006
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.