Europhys. Lett.
Volume 67, Number 5, September 2004
Page(s) 766 - 772
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 01 August 2004
Europhys. Lett., 67 (5), pp. 766-772 (2004)
DOI: 10.1209/epl/i2004-10131-8

Fano diagonalization of a polariton model for an inhomogeneous absorptive dielectric

L. G. Suttorp and A. J. van Wonderen

Institute for Theoretical Physics, University of Amsterdam Valckenierstraat 65, NL-1018 XE Amsterdam, The Netherlands

(Received 2 June 2004; accepted in final form 30 June 2004)

The Hamiltonian of a polariton model for an inhomogeneous linear absorptive dielectric is diagonalized by means of Fano's diagonalization method. The creation and annihilation operators for the independent normal modes are explicitly found as linear combinations of the canonical operators. The coefficients in these combinations depend on the tensorial Green function that governs the propagation of electromagnetic waves through the dielectric. The time-dependent electromagnetic fields in the Heisenberg picture are given in terms of the diagonalizing operators. These results justify the phenomenological quantization of the electromagnetic field in an absorptive dielectric.

42.50.Nn - Quantum optical phenomena in absorbing, dispersive and conducting media.
71.36.+c - Polaritons (including photon-phonon and photon-magnon interactions).
03.70.+k - Theory of quantized fields.

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