刘艳平

. J. Yu; XF. Kuang; YJ. Gao; YP. Wang; KQ. Chen; Liu, Z. W., Yanping Liu*(刘艳平). Direct Observation of Linear Dichroism Transition in Two-dimensional Palladium Diselenide

发布时间：2020-04-05

点击次数：

影响因子：12.97

DOI码：10.1021/acs.nanolett.9b04598

发表刊物：Nano Letters

关键字：2D material, Palladium diselenide, Linear dichroism transition, Anisotropy

摘要：Linear dichroism (LD) transition within anisotropic photonic materials display 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 due to 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 high absorption ratios 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 a good agreement with the theoretical structure symmetry analysis. This indicates the strong intrinsic LD effect in the anisotropic nature of PdSe2, which offers a macro-level determination of crystal orientations. Such unique LD conversion features, in combination with strong LD effects, enable the air-stable PdSe2 a potential candidate for technological innovations in multispectral imaging, sensing, polarization-sensitive, and wavelength-controllable photoelectronic applications.

论文类型：期刊论文

文献类型：J

卷号：20

期号：2

页面范围：1172-1182

是否译文：否

发表时间：2020-03-01

收录刊物：SCI

发布期刊链接：https://pubs.acs.org/doi/abs/10.1021/acs.nanolett.9b04598

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