Multiphoton-induced luminescence contrast between antiparallel ferroelectric domains in Mg-doped LiNbO3

被引：17

作者：

Reichenbach, P. ^{[1
]}

Kaempfe, T. ^{[1
]}

Thiessen, A. ^{[1
]}

Schroeder, M. ^{[1
]}

Haussmann, A. ^{[1
]}

Woike, T. ^{[2
]}

Eng, L. M. ^{[1
]}

机构：

[1] Tech Univ Dresden, Inst Angew Photophys, D-01069 Dresden, Germany

[2] Tech Univ Dresden, Inst Strukturphys, D-01069 Dresden, Germany

来源：

JOURNAL OF APPLIED PHYSICS | 2014年 / 115卷 / 21期

关键词：

LITHIUM-NIOBATE CRYSTALS; OPTICAL-ABSORPTION; SINGLE-CRYSTALS; VISUALIZATION; GENERATION; ORIGIN; LITAO3;

D O I：

10.1063/1.4881496

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on differentiating antiparallel ferroelectric domains in congruent Mg-doped LiNbO3 (Mg:LNO) single crystals through a multiphoton photoluminescence technique. Sample illumination with femtosecond laser pulses at lambda = 790 nm results in a broad multiphoton emission spectrum revealing a domain contrast of >3% between virgin and inverted domains. The contrast decreases via annealing and shows an exponential decay in the temperature range from 80 to 150 degrees C. Our findings give clear ground of a thermally induced structural change by surpassing a specific activation energy. Hence, the reported contrast dynamics must be closely connected to the thermal activation of charged defects, which dramatically alters the internal bias field of these defects. This explanation is also supported when using single crystal LNO of different Mg doping levels showing much lower multiphoton effects for a < 5% Mg concentration. Based on this effect of multiphoton luminescence, it becomes easy to microscopically monitor and quantify virgin and switched domains in LNO and other samples. (C) 2014 AIP Publishing LLC.

引用

页数：5