Effect of local rotations on the optical response of : Application to ion-beam damage

G. García; J. Olivares; F. Agulló-López; A. García-Navarro; F. Agulló-Rueda; A. García-Cabañes; M. Carrascosa

doi:10.1209/epl/i2006-10375-2

All issues

Volume 76 / No 6 (December 2006)

Europhys. Lett., 76 6 (2006) 1123-1129

Abstract

Issue		Europhys. Lett. Volume 76, Number 6, December 2006


Page(s)		1123 - 1129
Section		Condensed matter: structural, mechanical and thermal properties
DOI		https://doi.org/10.1209/epl/i2006-10375-2
Published online		16 November 2006

Europhys. Lett., 76 (6), pp. 1123-1129 (2006)

Effect of local rotations on the optical response of $\chem{LiNbO_3}$ : Application to ion-beam damage

G. García¹, J. Olivares², F. Agulló-López¹^,3, A. García-Navarro¹, F. Agulló-Rueda⁴, A. García-Cabañes³ and M. Carrascosa³

¹ 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

Received: 11 August 2006
Accepted: 17 October 2006

Abstract

The effect of local rigid rotations of the $\chem{LiNbO_3}$ structure on the optical response has been theoretically explored and compared to experimental data obtained after irradiation with F (20–22 $\un{MeV}$ ), O (20 $\un{MeV}$ ) and Mg (39 $\un{MeV}$ ) 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 $\exp [-\theta/\theta_0]$ for the rotation angle with respect to the trigonal (Z-axis) and isotropic azimuthal angle ϕ. The corresponding $\theta_0$ angle is in the range 4.6– $7.0^{\circ}$ 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)

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