Linear and non-linear optical properties of metallic nanocrystals in sapphire

被引：0

作者：

Mota-Santiago, P. E. ^{[1
]}

Crespo-Sosa, A. ^{[1
]}

Jimenez-Hernandez, J. L. ^{[1
]}

Sanchez-Dena, O. ^{[1
]}

Fernandez-Hernandez, R. C. ^{[1
]}

Reyes-Esqueda, J. A. ^{[1
]}

Oliver, A. ^{[1
]}

机构：

[1] Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico

来源：

22ND CONGRESS OF THE INTERNATIONAL COMMISSION FOR OPTICS: LIGHT FOR THE DEVELOPMENT OF THE WORLD | 2011年 / 8011卷

关键词：

sapphire; optical absorption; photoluminescence; Z-scan; saturated absorption; optical properties; ION-IMPLANTATION; AU NANOPARTICLES; SILICA; AG; CU;

D O I：

10.1117/12.903344

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this paper we report the linear and non-linear optical properties of metallic nano-clusters in alpha-Al2O3 fabricated by ion implantation (from 2 to 8x10(16) ions/cm(2)). Thereafter, the samples were annealed at temperatures from 600 to 1100 degrees C in oxidising, reducing atmospheres. Once spherical nano-particles were synthesized, the samples were further irradiated with Si+++ with different energies and fluences to control the achieved anisotropy. As a result of the ion implantation mostly F+ color centers were formed. After thermal annealing they capture an electron to form F centers or combine to form a F-2(+) center. Also, the photoluminescence signal from Al+ interstitials appears. Regarding the non-linear optical response, the spherical-like Au nano-crystals embedded in sapphire show a positive non-linear absorption at 355 nm and negative non-linear absorption at 532 nm, which shows saturation when increasing the incident irradiance. They also present positive non-linear refraction at 532 nm, which is null at 355 nm. For the anisotropic systems, a larger birefringence than natural values was measured in the visible range by ellipsometry means.

引用

页数：10