Mr. Ye-Ru Chen Profile

Ye-Ru Chen

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Proceedings Article | 15 March 2023 Presentation + Paper

Revealing substrate-coupling strengths of layered materials by using spin angular momentum of light

Yu-Chen Chang, Ye-Ru Chen, Yu-Fan Chiang, Yann-Wen Lan, Ting-Hua Lu

Proceedings Volume 12436, 124360L (2023) https://doi.org/10.1117/12.2648896

KEYWORDS: Raman spectroscopy, Graphene, Polarized light, 2D materials, Angular momentum

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We study here the amount of helicity exchange of scattered light from the monolayer molybdenum disulfide (MoS₂) or graphene on different structures by using spin angular momentum of light in Raman spectroscopy. Our in-house modified Raman spectroscopy setup is used for analyzing the optical helicity by calculating the degree of circular polarization (DoCP) of circularly polarized incident light when scattered from the 2D materials on different substrates. We observe Raman intensity variation when controlling phonon vibration of the 2D materials under the polarized excitation. The experimental results show that the layered materials deposited on SiO₂/Si substrates has maximum DoCP as compared to other substrates with different structures. All the findings are analyzed by numerical simulation that incorporate the related Raman tensors and optical Jones calculus, which is worth exploring the phonon-electron interaction.

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