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Updated: Jun 6, 2025

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
Linear Interplay Between Raman Shift and Laser Irradiation in Photothermal-Strained Monoclinic Vanadium Dioxide
Yingbo Li1,2,3, He Jiang1,2,3, Yanqing Zhang1,2,3
1Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-sen University, Guangzhou, 510275, China.
Abstract:
Vanadium dioxide as a strongly correlated electron material undergoes metal-insulator phase transitions and ferroelastic domain switching which highly couple to local strain distribution. Understanding the mechanisms and achieving the modulations require precise and high-resolution characterization of strain in vanadium dioxide. Micro-Raman spectroscopy is widely used to nondestructively characterize the strain on the surface of materials. However, vanadium dioxide is sensitive to multi-fields and with multiple physical properties correlated. It is vital and challenging to uncouple the multiple responses of vanadium dioxide to micro-Raman spectroscopy and achieve precise characterization of strain distribution. Herein, a linear relation between Raman shift and laser irradiation is revealed, which is originated from photothermal strain in monoclinic vanadium dioxide. By linear fitting and extrapolation, the strain-dependent coefficient is obtained for drifting of Raman shift and the intrinsic Raman shift without strain or laser irradiation, which enables to precisely characterize the strain distribution in vanadium dioxide.
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