Journal
NANO LETTERS
Volume 20, Issue 2, Pages 1172-1182Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b04598
Keywords
Two-dimensional material; palladium diselenide; linear dichroism transition; anisotropy
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Funding
- National Natural Science Foundation of China [61775241, 11674092]
- Youth Innovation Team of CSU [2019012]
- Hunan province key research and development project [2019GK2233]
- Science and Technology Innovation Basic Research Project of Shenzhen [JCYJ20180307151237242]
- Australian Research Council (ARC) [DP180102976]
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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 alpha(y)/alpha(x) approximate to 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 A(g) and B-1g 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.
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