Direct Observation of the Linear Dichroism Transition in Two-Dimensional Palladium Diselenide.,Nano Letters

当前位置： X-MOL 学术 › Nano Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Direct Observation of the Linear Dichroism Transition in Two-Dimensional Palladium Diselenide.
Nano Letters ( IF 9.6 ) Pub Date : 2020-01-23 , DOI: 10.1021/acs.nanolett.9b04598
Juan Yu _{1,

2} , Xiaofei Kuang ₂ , Yuanji Gao ₁ , Yunpeng Wang ₁ , Keqiu Chen ₃ , Zhongke Ding ₃ , Jia Liu ₄ , Chunxiao Cong ₅ , Jun He ₁ , Zongwen Liu ₆ , Yanping Liu _{1,

7,

8}

Affiliation

School of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process , Central South University , 932 South Lushan Road , Changsha , Hunan 410083 , People's Republic of China.
School of Electronics and Information , Hangzhou Dianzi University , 1158 Second Street, Xiasha College Park , Hangzhou , Zhejiang 310018 , People's Republic of China.
Department of Applied Physics, School of Physics and Electronics , Hunan University , Changsha 410082 , People's Republic of China.
Gemmological Institute , China University of Geoscience , Wuhan 430074 , People's Republic of China.
School of Information Science and Technology , Fudan University , Shanghai 200433 , People's Republic of China.
School of Chemical and Biomolecular Engineering , The University of Sydney , Darlington NSW 2008 , Australia.
Shenzhen Research Institute of Central South University , A510a, Virtual University Building, Southern District, High-Tech Industrial Park, Yuehai Street, Nanshan District , Shenzhen , People's Republic of China.
State Key Laboratory of High Performance Complex Manufacturing , Central South University , 932 South Lushan Road , Changsha , Hunan 410083 , People's Republic of China.

The linear dichroism (LD) transition within anisotropic photonic materials displays promising prospects for applications in polarization-wavelength-selective detectors, optical switching, and optical communication. In conventional two-dimensional (2D) anisotropic materials, the LD is predominantly uniaxial over a broad spectrum of wavelengths and arises principally from the reduced symmetry of the materials. However, the LD transition behavior in crystalline 2D materials remains elusive. Here, we demonstrate the observation of a unique LD conversion phenomenon at a wavelength of 472 nm in palladium diselenide (PdSe2) using polarization-resolved absorption spectroscopy. This material exhibits prominent anisotropic responses and a high absorption ratio of αy/αx ≈ 1.11 at 364 nm, 1.15 at 532 nm, and 0.84 at 633 nm. We propose that this abnormal LD conversion behavior originates from the forceful localization rules at different parallel energy bands that exist within this material. Furthermore, the robust periodicity of Ag and B1g modes in polarization-resolved Raman spectroscopy is in good agreement with the theoretical structure symmetry analysis. This indicates the strong intrinsic LD effect in the anisotropic nature of PdSe2, which offers a macrolevel determination of crystal orientations. Such unique LD conversion features, in combination with strong LD effects, enable the air-stable PdSe2 to be a potential candidate for technological innovations in multispectral imaging, sensing, and polarization-sensitive and wavelength-controllable photoelectronic applications.

中文翻译：

二维二硒化钯中线性二向色性转变的直接观察。

各向异性光子材料中的线性二向色性（LD）过渡在偏振波长选择检测器，光学开关和光学通信中的应用显示出广阔的前景。在常规的二维（2D）各向异性材料中，LD主要是在宽光谱范围内是单轴的，并且主要是由于材料的对称性降低而引起的。但是，晶体2D材料中的LD过渡行为仍然难以捉摸。在这里，我们证明了使用偏极化分辨吸收光谱法在二硒化钯（PdSe2）中观察到独特的LD转换现象，该现象在472 nm的波长处。这种材料表现出显着的各向异性响应，并且在364 nm处的高吸收率αy/αx≈1.11，在532 nm处为1.15，在633 nm处为0.84。我们建议这种异常的LD转换行为源自该材料内存在的不同平行能带上的强力定位规则。此外，在偏振分辨拉曼光谱中Ag和B1g模式的鲁棒周期性与理论结构对称性分析非常吻合。这表明在PdSe2的各向异性中，强烈的内在LD效应，这提供了晶体取向的宏观确定。这种独特的LD转换功能与强大的LD效应相结合，使空气稳定的PdSe2成为多光谱成像，传感，偏振敏感和波长可控的光电应用中技术创新的潜在候选者。

更新日期：2020-01-24

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11