Chen Hsaio-Wen, Li Chien-I, Ma Chun-Hao, Chu Ying-Hao, Liu Hsiang-Lin
Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan.
Phys Chem Chem Phys. 2021 Apr 14;23(14):8908-8915. doi: 10.1039/d1cp00642h. Epub 2021 Apr 6.
Transparent VO/muscovite heterostructures have attracted considerable attention because of their unique chemical and physical properties and potential practical applications. In this paper, we investigated the influence of uniaxial mechanical strain on the optical properties of VO/muscovite heterostructures through Raman scattering and optical transmittance measurements. Under applied strain, linear shifts in peak positions of Raman-active phonon modes at approximately 340, 309, and 391 cm were observed. The extracted Grüneisen parameter values were approximately between 0.44 and 0.57. Furthermore, a pronounced strain-induced change in the metal-insulator transition (MIT) temperature was observed, which decreased under compressive strain and increased under tensile strain. The rates of MIT temperature variation reached 4.5 °C per % and 7.1 °C per % at a wavelength of 1200 nm during heating and cooling processes, respectively. These results demonstrate that the modulation of the optical properties of VO/muscovite heterostructures is controllable and reversible through strain engineering, opening up new opportunities for applications in flexible and tunable photonic devices.
透明的VO/白云母异质结构因其独特的化学和物理性质以及潜在的实际应用而备受关注。在本文中，我们通过拉曼散射和光学透过率测量研究了单轴机械应变对VO/白云母异质结构光学性质的影响。在施加应变时，观察到拉曼活性声子模式在约340、309和391 cm处的峰位发生线性位移。提取的格林艾森参数值约在0.44至0.57之间。此外，还观察到金属-绝缘体转变（MIT）温度有明显的应变诱导变化，在压缩应变下降低，在拉伸应变下升高。在加热和冷却过程中，在1200 nm波长处，MIT温度变化率分别达到每% 4.5 °C和每% 7.1 °C。这些结果表明，通过应变工程对VO/白云母异质结构的光学性质进行调制是可控且可逆的，为柔性和可调谐光子器件的应用开辟了新机遇。
