Observation of an exceptional point in a chaotic optical microcavity.
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.
Lee
Sang-Bum
SB
School of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea.
Yang
Juhee
J
Moon
Songky
S
Lee
Soo-Young
SY
Shim
Jeong-Bo
JB
Kim
Sang Wook
SW
Lee
Jai-Hyung
JH
An
Kyungwon
K