Lu Junfeng, Xu Chunxiang, Li Fangtao, Yang Zheng, Peng Yiyao, Li Xiaoyi, Que Miaoling, Pan Caofeng, Wang Zhong Lin
Beijing Institute of Nanoenergy and Nanosystems , Chinese Academy of Sciences , Beijing 100083 , P. R. China.
College of Nanoscience and Technology , University of Chinese Academy of Sciences , Beijing 100049 , P. R. China.
ACS Nano. 2018 Dec 26;12(12):11899-11906. doi: 10.1021/acsnano.8b06500. Epub 2018 Nov 12.
We report a dynamic tuning on coherent light emission wavelengths of single ZnO microwire by using the piezoelectric effect. Owing to the dominant role occupied by the piezoelectric polarization effect in the wurtzite-structure ZnO microwire, the effective dielectric constant (or refraction index) of the gain media was modulated toward an increasing trend by applying a tensile strain, resulting in a shift of the strain-mediated whispering-gallery mode (WGM) lasing at room temperature. Also, the strain required to resolve the spectra in the two operating types of PL and lasing were systematically analyzed and compared. Because of the narrow line width in the lasing mode, the strain-dependent spectral resolution was improved by an order of magnitude, making it feasible for achieving high-precision, ultrasensitive, and noncontact stress sensing. Our results have an important impact on laser modulation, optical communication, and optical sensing technology.
我们报道了利用压电效应实现对单个ZnO微线相干发光波长的动态调谐。由于纤锌矿结构ZnO微线中压电极化效应占主导地位，通过施加拉伸应变，增益介质的有效介电常数（或折射率）朝着增加的趋势调制，导致室温下应变介导的回音壁模式（WGM）激光发生偏移。此外，还系统地分析和比较了在光致发光（PL）和激光两种工作类型中解析光谱所需的应变。由于激光模式下的线宽较窄，应变相关的光谱分辨率提高了一个数量级，使得实现高精度、超灵敏和非接触应力传感成为可能。我们的结果对激光调制、光通信和光学传感技术具有重要影响。
