Giant nonlinear optical activity in two-dimensional palladium diselenide.
发布时间：2021-02-09
点击次数：
DOI码：10.1038/s41467-021-21267-4
发表刊物：Nature Communications (Editors' Highlights）
关键字：Palladium diselenide (PdSe2), two-photon absorption, giant modulation depths, nonlinear optical effects
摘要：Nonlinear optical effects in layered two-dimensional transition metal chalcogenides have been extensively explored recently because of the promising prospect of the nonlinear optical effects for various optoelectronic applications. However, these materials possess sizable bandgaps ranging from visible to ultraviolet regions, so the investigation of narrow-bandgap materials remains deficient. Here, we report our comprehensive study on the nonlinear optical processes in palladium diselenide (PdSe2) that has a near-infrared bandgap. Interestingly, this material exhibits a unique thickness-dependent second harmonic generation feature, which is in contrast to other transition metal chalcogenides. Furthermore, the two-photon absorption coefficients of 1-3 layer PdSe2 (β~4.16×105, 2.58×105, and 1.51×105 cm GW-1) are larger by two and three orders of magnitude than that of the conventional two-dimensional materials, and giant modulation depths (s~32%, 27%, and 24%) were obtained in 1-3 layer PdSe2. Such unique nonlinear optical characteristics make PdSe2 a potential candidate for technological innovations in nonlinear optoelectronic devices.
论文类型：文章
通讯作者：Juan Yu, Xiaofei Kuang, Junzi Li, Jiahong Zhong, Cheng Zeng, Lingkai Cao, Zongwen Liu, Zhouxiaosong Zeng, Ziyu Luo, Tingchao He, Anlian Pan & YP. Liu(刘艳平)*
学科门类：理学
一级学科：物理学
文献类型：J
卷号：12
期号：1083
是否译文：否
发表时间：2021-02-17
收录刊物：SCI
发布期刊链接：https://www.nature.com/articles/s41467-021-21267-4#article-info
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