Superlinear photovoltaic currents in proton-exchanged LiNbO3 waveguides

被引：0
|
作者：
G. de la Paliza
O. Caballero
A. García-Cabañes
M. Carrascosa
J.M. Cabrera
机构：
[1] Universidad Autónoma de Madrid,
[2] Departamento de Física de Materiales C-IV,undefined
[3] Campus de Cantoblanco,undefined
[4] 28049 Madrid,undefined
[5] Spain,undefined
来源：
Applied Physics B | 2003年 / 76卷
关键词：
PACS: 42.65.Wi; 42.70.Nq; 72.40.+w;
D O I：
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中图分类号：
学科分类号：
摘要：
Photovoltaic currents along the c axis have been measured in α-phase LiNbO3 proton-exchanged waveguides at several visible wavelengths for a guided-beam configuration. The light-intensity dependence is superlinear and all experimental curves are very well fitted by computer simulations using a two-centre model, with Fe2+/Fe3+ as primary and NbLi4+/NbLi5+ as secondary photovoltaic centres. The superlinear behaviour arises from a much higher effective photovoltaic length of NbLi4+ (small polaron) compared with that of Fe2+. In β1-phase guides, the photocurrents are much smaller than in α-phase guides and apparently do not show superlinear behaviour.
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页码：555 / 559
页数：4
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