Glass - Back to the Future!

Presenting Author:
Felix Lind

article posted 21 April 2016

Felix Lind graduated at the Friedrich Schiller University of Jena, Germany with a diploma in physics in 2014. Since 2015 he is PhD student at the Otto Schott Institute of Materials Research in Jena. The primary focus of his work is the investigation of induced structural changes in (boro-)silicate glasses and in glasses with highly polarizable cations.

Electro-thermal poling of new Sb2O3-based multicomponent heavy metal oxide glasses

F. Lind1*, V. Frei1, D. Möncke1, D. Palles2, S.M. Toufik3, E.I. Kamitsos2, L. Wondraczek1
1Otto Schott Institute of Materials Research, Friedrich Schiller University, Jena, Germany
2Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Athens, Greece
3University of Biskra, Laboratory of Physics of Photonics and Multifunctional Nanomaterials, Biskra, Algeria

Nonlinear electro-optical devices like ultrafast optical switches, modulators and power limiters require large nonlinear optical coefficients. Although it remains a challenge in photonics to induce reproducible and efficient second-order nonlinear optical properties in isotropic materials, oxide glasses subjected to electro-thermal poling can exhibit a significant and stable second-order optical coefficient [1]. While isotropic glasses do not give even order nonlinear responses, such as second harmonic generation (SHG), electric-field-induced-second-harmonic (EFISH) can be demonstrated in glasses with high third order susceptibility χ3 [2].
The introduction of PbO and WO3 in antimony oxide-based glasses appeared promising for potential nonlinear optical applications due to the increasing polarizability and thus, high χ3. Therefore, quaternary antimonite glasses in the system Sb2O3-M2O-WO3-PbO (with M = Na, Li or K) were electro-thermally poled using so-called blocking electrodes (no contact of the glass sample to the atmosphere during poling). The poling-induced second harmonic generation was measured for a series of antimonite glasses of varying alkali oxide and compared with thermally poled vitreous silica reference glass Infrasil 301 (see Figure 1). Structural changes at the anode surface were investigated by micro-Raman scattering and infrared reflectance spectroscopy.
Cations of the alkali oxide are expected to migrate during poling from the anode side to the cathode side of the sample. A static electric field is induced within the glassy matrix in the cation-depleted region near the anode side, which implements the formation of an axial symmetry. For ionic conducting glasses such a displacement of cations should be compensated by structural rearrangements as demonstrated in this presentation.

Figure 1: SHG intensity of electro-thermally poled Sb2O3-M2O-WO3-PbO glass (SMWP, with M = Na, Li, K).

[1] D. Möncke, M. Dussauze, E.I. Kamitsos, C.P. Varsamis, and D. Ehrt, Phys. Chem. Glasses: Eur. J. Glass Sci. Technol. B 50, 229 (2009). [2] G. Guimbretiere, M. Dussauze, V. Rodriguez, and E.I. Kamitsos, Appl. Phys. Lett. 97, 171103/1-3 (2010).

The program DAAD-IKYDA 2015 is gratefully acknowledged for financial support.