Observation of Superradiance by Nonlocal Wave Coupling of Light and Excitons in CuCl Thin Films

Masayoshi Ichimiya, Masaaki Ashida, Hideki Yasuda, Hajime Ishihara, and Tadashi Itoh

Phys. Rev. Lett. 103, 257401 – Published 14 December 2009

Abstract

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.

Received 24 September 2008

DOI:https://doi.org/10.1103/PhysRevLett.103.257401

Authors & Affiliations

Masayoshi Ichimiya^1,2,*, Masaaki Ashida^1,2, Hideki Yasuda^1,3, Hajime Ishihara^1,3, and Tadashi Itoh^1,2

¹CREST-JST, 4-1-8 Honmachi, Kawaguchi 332-0012, Japan
²Department of Materials Engineering Science, Osaka University, Osaka 560-8631, Japan
³Department of Physics and Electronics, Osaka Prefecture University, Osaka 599-8631, Japan

^*ichimiya@laser.mp.es.osaka-u.ac.jp

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Issue

Vol. 103, Iss. 25 — 18 December 2009

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