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Modulation of Photothermal Anisotropy using Black Phosphorus/ Rhenium Diselenide Heterostructures


Manipulating the polarization of an incident beam using two-dimensional materials has become an important research direction towards the development of nano-optical devices. Black phosphorus (BP) and rhenium diselenide (ReSe2) possess excellent in-plane optical anisotropy with optical birefringence in the visible region, which has led to novel applications in polarizing optics and optoelectronics. Herein, the polarization-dependent absorption of BP and ReSe2 and a modulated pump beam is utilized to obtain the photothermal signal of them. The photothermal anisotropy of BP and ReSe2 has been explored using photothermal detection. Then we define the photothermal contrast using the ratio of the maximum to the minimum of the photothermal signal. The photothermal contrast of BP and ReSe2 can be obtained accurately by relationship between polarization angle of pump light and photothermal signal. We demonstrate that a layered BP with different thicknesses can remarkably change the photothermal contrast. In contrast, the photothermal contrast of ReSe2 does not change with the different thicknesses of the samples. Further, the photothermal anisotropy of BP/ReSe2 heterostructures were also explored. The photothermal contrast of samples were observed to change with different the stacking angles indicating that the photothermal anisotropy of heterostructures dependent on the stacking angle. Our findings provide new prospects for designing novel optical devices based on two-dimensional anisotropic materials, with potential applications in electronics, photonics, and optoelectronics.

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Publication details

The article was received on 17 Mar 2018, accepted on 15 May 2018 and first published on 16 May 2018

Article type: Communication
DOI: 10.1039/C8NR02229A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Modulation of Photothermal Anisotropy using Black Phosphorus/ Rhenium Diselenide Heterostructures

    X. Gao, G. Chen, D. Li, X. Li, Z. Liu and J. Tian, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR02229A

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