Observation of superradiance by nonlocal wave coupling of light and excitons in CuCl thin films.
We report the observation of a remarkably strong coupling between light and a multinode-type exciton. The observed radiative decay time reaches the order of 100 fs, which is much faster than the dephasing process of nonradiative scattering. In this high-speed superradiance, the light wave and the excitonic wave in a high-quality thin film form a harmonized wave-wave coupling over a range of multiple wavelengths. This mechanism contradicts the conventional physical description of light-matter interaction based on the long-wavelength approximation.
Ichimiya
Masayoshi
M
CREST-JST, 4-1-8 Honmachi, Kawaguchi 332-0012, Japan. ichimiya@laser.mp.es.osaka-u.ac.jp
Ashida
Masaaki
M
Yasuda
Hideki
H
Ishihara
Hajime
H
Itoh
Tadashi
T