中国激光, 2019, 46 (2): 0213002, 网络出版: 2019-05-09
溶胶-凝胶法制备TiO2-SiO2混合微球腔的激发高阶回音壁模式 下载: 1136次
High-Order Whispering Gallery Modes in TiO2-SiO2 Hybrid Microsphere Cavity Prepared with Sol-Gel Method
光谱学 高阶回音壁模式 溶胶-凝胶法 混合微球腔 谐振调节 TiO2薄膜 spectroscopy high-order whispering gallery mode sol-gel method hybrid microsphere cavity resonance-tailoring TiO2 film
摘要
采用电极火花放电法和溶胶-凝胶法制备了直径均为206 μm的SiO2微球腔和TiO2-SiO2混合微球腔,测得它们在1550 nm处的品质因子分别为2.15×10
7和1.36×10
6。宽带谐振透射谱显示,与相同尺寸的SiO2微球腔相比,混合腔中高阶回音壁模式的谐振峰吸收深度比增大,有效激发了高阶模式; 另外,谐振波长平均红移了0.706 nm,对应的自由光谱范围减小了0.020 nm,表明TiO2薄膜能有效调节SiO2微球腔的谐振特性。直径为134 μm的微球腔的谐振波长平均红移量和自由光谱范围平均减小量分别为1.012 nm和0.022 nm,表明小尺寸微球腔具有更强的谐振调节能力。
Abstract
The SiO2 microsphere cavity and the TiO2-SiO2 hybrid microsphere cavity with diameters of 206 μm are prepared with the electrode spark discharge method and the sol-gel method. The Q values of two microsphere cavities at 1550 nm are 2.15×10
7 and 1.36×10
6, respectively. The broadband resonant transmission spectra show that compared with those in the same size of SiO2 microsphere cavity,the absorption depth ratios of the resonant peaks of the high-order whispering gallery modes in the hybrid microsphere cavity increase obviously, indicating that the high-order modes are effectively excited. Moreover, the average red shift of the resonant wavelengths is 0.706 nm and the corresponding free spectral range is reduced by 0.020 nm, indicating that the resonant characteristics of the SiO2 microsphere cavity can be effectively tailored by the TiO2 film. The average red shift of resonant wavelength and the average reduction of free spectral range of the microsphere cavity with a diameter of 134 μm are 1.012 nm and 0.022 nm, respectively, indicating that small size microsphere cavities have strong resonance-tailoring capability.
柯超珍, 许灿华, 黄衍堂, 马靖. 溶胶-凝胶法制备TiO2-SiO2混合微球腔的激发高阶回音壁模式[J]. 中国激光, 2019, 46(2): 0213002. Chaozhen Ke, Canhua Xu, Yantang Huang, Jing Ma. High-Order Whispering Gallery Modes in TiO2-SiO2 Hybrid Microsphere Cavity Prepared with Sol-Gel Method[J]. Chinese Journal of Lasers, 2019, 46(2): 0213002.