摘要
回音壁模式(WGM)光学微球腔,因具有传播模式稳定闭合、光能量密度极高、结构简单、易于制备等特点,在微球激光的应用上受到广泛关注。不同物理尺寸的微球腔对应的模式特征也大不相同,这一特性被应用于光学传感器、非线性光学等领域。通过二维时域有限差分法(2D-FDTD)对二氧化硅微球进行理论模拟,分析了球腔在不同模式下的电场分布,以及不同直径下的模式有效折射率、品质因子(Q值)的变化。根据模拟结果推断,理论上能形成具有稳定模式的激光最小直径约为7.8μm。这对于WGM微球腔激光的应用具有重要意义。
Whispering gallery mode(WGM)optical microsphere cavity has attracted extensive attention in the application of microsphere laser due to its characteristics of stable closure of propagation mode,high optical energy density,simple structure and easy preparation.The corresponding mode characteristics of microsphere lasing under different physical sizes are also different,which has been applied to optical sensors,nonlinear optics and other fields.In this paper,two-dimensional finite difference time domain method(2 D-FDTD)is used to theoretically simulate silica microspheres,and the changes of the effective refractive index and quality factor(Q)of the spherical cavity under different modes as well as under different diameters are analyzed.The simulation results show that the minimum diameter of the laser with stable mode is about 7.8μm.This is of great significance for the application of WGM microsphere cavity laser.
作者
杨礼铨
于佳鑫
YANG Liquan;YU Jiaxin(Shanghai Key Laboratory of Modern Optical System,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《光学仪器》
2021年第4期28-32,共5页
Optical Instruments
基金
国家自然科学基金(NSFC11604210)。
