Lee Sang-Bum, Yang Juhee, Moon Songky, Lee Soo-Young, Shim Jeong-Bo, Kim Sang Wook, Lee Jai-Hyung, An Kyungwon
School of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
Phys Rev Lett. 2009 Sep 25;103(13):134101. doi: 10.1103/PhysRevLett.103.134101.
We present spectroscopic observation of an exceptional point or the transition point between mode crossing and avoided mode crossing of neighboring quasieigenmodes in a chaotic optical microcavity of a large size parameter. The transition to the avoided mode crossing was impeded until the degree of deformation exceeded a threshold deformation owing to the system's openness also enhanced by the shape deformation. As a result, a singular topology was observed around the exceptional point on the eigenfrequency surfaces, resulting in fundamental inconsistency in mode labeling.
我们展示了对一个特殊点的光谱观测，该点是具有大尺寸参数的混沌光学微腔中相邻准本征模的模式交叉和避免模式交叉之间的转变点。由于形状变形也增强了系统的开放性，直到变形程度超过阈值变形，向避免模式交叉的转变才受到阻碍。结果，在本征频率表面上的特殊点周围观察到奇异拓扑，导致模式标记出现根本不一致。
