INFLUENCES OF NONLINEAR INTERACTIONS ON POLARITONS
Niu Jia-sheng (牛家胜)ab, Luo Ying (罗莹)b, Ma Ben-kun (马本堃)b
a Institute of Low Energy Nuclear Physics, Beijing Normal University, Beijing 100875, China; b Department of Physics, Beijing Normal University, Beijing 100875, China
Abstract In this paper, we have analysed theoretically the polarization and dielectric constant generated by the nonlinear interactions between ions in ionic crystals. The spectrum of polaritons (coupling modes of photons and optical phonons) under nonlinear interactions has been developed. A new branch of dispersion relations has emerged in the original frequency gap between $\omega$TO and $\omega$LO.
Received: 30 November 2000
Revised: 17 April 2001
Accepted manuscript online:
PACS:
71.36.+c
(Polaritons (including photon-phonon and photon-magnon interactions))
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