Multiphoton-induced luminescence contrast between antiparallel ferroelectric domains in Mg-doped LiNbO3
Multiphoton-induced luminescence contrast between antiparallel ferroelectric domains in Mg-doped LiNbO3
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DOI：
10.1063/1.4881496
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发表时间：
2014-06
影响因子：
3.2
通讯作者：
P. Reichenbach;T. Kämpfe;A. Thiessen;Mathias Schröder;A. Haußmann;T. Woike;L. Eng
中科院分区：
文献类型：
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作者：
P. Reichenbach;T. Kämpfe;A. Thiessen;Mathias Schröder;A. Haußmann;T. Woike;L. Eng
我们报告区分反平行铁电畴同成分掺镁铌酸锂（Mg：LNO）单晶通过多光子光致发光技术。用λ = 790 nm的飞秒激光脉冲照射样品，得到宽的多光子发射光谱，揭示了原始畴和反转畴之间>3%的畴对比度。对比度通过退火降低，并且在80至150 °C的温度范围内显示指数衰减。我们的研究结果给出了一个明确的理由，热诱导的结构变化超过了一个特定的活化能。因此，所报道的对比度动态必须与带电缺陷的热激活密切相关，这极大地改变了这些缺陷的内部偏置场。当使用不同Mg掺杂水平的单晶LNO时，该解释也得到支持，对于< 5%的Mg浓度，该单晶LNO显示出低得多的多光子效应。基于多光子发光的这种效应，它变得容易在显微镜下监测和…
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 λ = 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 °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 ...