半导体微盘的回音壁模式研究

Study on the whispering gallery modes of microdisk of semiconductor

摘要: 采用二维时域有限差分法(FDTD),计算分析了半导体微盘的形状如圆形、椭圆形等对激发其回音壁模式的影响;同时也研究了半导体微盘在不同的增益介质如水、空气、乙醇等中所形成的回音壁模式.研究结果表明:①在同一增益介质中,半导体微盘形状对形成回音壁模式有很大的影响,模式的形成与各点的曲率半径有关,曲率半径越大,越容易形成回音壁模式;②在不同增益介质中,相对折射率n12越大,越容易形成回音壁模式,且有利于提高其Q值.

Abstract: A numerical analysis of the effect of the circular and elliptic semiconductor microdisks on their whispering gallery modes(WGMs) was presented by using two-dimension finite-difference time-domain(FDTD) method.The WGMs in different media such as air,water,alcohol and etc.also have been studied.The results show that ① the shape and size of the semiconductor microdisk affect to form the WGMs in a medium;② the relative index of refraction n12 of the semiconductor microdisk to the surrounding active medium affects to form the WGMs.The higher n12 is,the easeier the WGMs form.