Birefringence in the Polarized Raman Scattering of Biaxial van der Waals α‐MoO3. Issue 24 (30th September 2022)

• Record Type: Journal Article
• Authors: Zhao, Yanyu; Gong, Youning; Zhu, Jiaqi; Li, Delong; Mao, Hu; Bao, Qiaoliang; Zhang, Yupeng; Wang, Guo Ping
• Is Part Of: Advanced optical materials. Volume 10:Issue 24(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-09-30
• Subjects: birefringence -- optical anisotropy -- phonons -- polarized Raman scattering -- van der Waals crystals; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202201528
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: The effect of birefringence in anisotropic materials has been a long‐term issue for polarized Raman scattering. In this work, the polarization‐dependent Raman scattering in anisotropically birefringent materials is modeled with birefringence considered in the fundamental polarization selection rule. The birefringence‐induced polarization transformation is treated as a tensor in the calculation of Raman scattering intensity. The validity of this theory is further demonstrated in experiments by taking angle‐resolved polarized Raman measurements on the basal and cross planes of α‐MoO3 —a typical biaxial van der Waals crystal with strong in‐plane and out‐of‐plane anisotropy. The anomalous angular dependency of polarized Raman scattering intensity can be well reproduced by the modified theoretical model with fitted real‐valued Raman tensors and birefringence‐related parameters. It can be concluded that this work can provide a valuable reference and guidance for quantitative analyses of anisotropic materials by using polarization‐resolved Raman scattering spectroscopy. Abstract : Polarized Raman scattering in anisotropically birefringent materials is modeled with the birefringence effect considered in the fundamental polarization selection rule. The birefringence‐induced polarization transformation is treated as a tensor in the calculation of Raman scattering intensity. The anomalous angular dependency of Raman intensity can be well reproduced by the modified theoretical model with fitted real‐valued Raman tensors and birefringence‐related parameters.