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Journal of the Physical Society of Japan

Superabsorption and Its Application to Infrared Multiphoton Reactions

Mikio Katayama

Published Jan 15, 1991• 0 citations
Publisher

Abstract

Bond-selective chemistry, infrared multiphoton dissociation, relaxation time, absorption cross section, excitation rate, superradiance, spontaneous radiative transition, superabsorption
DOI
10.1143/jpsj.60.340

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We study effects of direct interatomic interaction on cooperative processes in atom-photon dynamics. Using a model of two-level atoms with Ising-type interaction as an example, it is demonstrated that interparticle interaction can promote cooperative radiative relaxation. For small number of atoms this results in inhibition of incoherent spontaneous decay leading to the regime of collective pulse relaxation. Above superradiance threshold increase in delay time and enhancement of superradiance is occurred. In the case of strong interaction (as compared to excitation energy of an atom) transition to the regime of multiphoton relaxation occurs, which we discuss using a simple model of two atoms in a high-Q single mode cavity. It is shown that such transition is accompanied by Rabi oscillations involving many-atom multiphoton states. Dephasing effect of dipole-dipole interaction and solitonic mechanism of relaxation are discussed as well.