Yu Juan, Kuang Xiaofei, Li Junzi, Zhong Jiahong, Zeng Cheng, Cao Lingkai, Liu Zongwen, Zeng Zhouxiaosong, Luo Ziyu, He Tingchao, Pan Anlian, Liu Yanping
School of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South University, Changsha, Hunan, People's Republic of China.
State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha, Hunan, People's Republic of China.
Nat Commun. 2021 Feb 17;12(1):1083. doi: 10.1038/s41467-021-21267-4.
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 region, so the investigation of narrow-bandgap materials remains deficient. Here, we report our comprehensive study on the nonlinear optical processes in palladium diselenide (PdSe) 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 PdSe (β ~ 4.16 × 10, 2.58 × 10, and 1.51 × 10 cm GW) are larger by two and three orders of magnitude than that of the conventional two-dimensional materials, and giant modulation depths (α ~ 32%, 27%, and 24%) were obtained in 1-3 layer PdSe. Such unique nonlinear optical characteristics make PdSe a potential candidate for technological innovations in nonlinear optoelectronic devices.
由于非线性光学效应在各种光电器件应用中具有广阔前景，近年来，层状二维过渡金属硫族化合物中的非线性光学效应得到了广泛研究。然而，这些材料具有从可见光到紫外区域的较大带隙，因此对窄带隙材料的研究仍然不足。在此，我们报告了对具有近红外带隙的二硒化钯（PdSe）中非线性光学过程的全面研究。有趣的是，这种材料表现出独特的厚度依赖性二次谐波产生特性，这与其他过渡金属硫族化合物不同。此外，1 - 3层PdSe的双光子吸收系数（β ~ 4.16 × 10、2.58 × 10和1.51 × 10 cm GW）比传统二维材料大两到三个数量级，并且在1 - 3层PdSe中获得了巨大的调制深度（α ~ 32%、27%和24%）。这种独特的非线性光学特性使PdSe成为非线性光电器件技术创新的潜在候选材料。
Zotero 插件
