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Organic materials offer great potential for a wide range of applications in both linear (e.g., organic light-emitting diodes, photodetectors, polarizers, polarized light-emitting sources, birefringent optical memories) and nonlinear optics (e.g., waveguide second-harmonic generation, electro-optic modulators, directional couplers). Among the different accessible geometries, planar microcavities are interesting structures in which to study the optical properties of organic materials. Planar microcavities are one-dimensional photonic structures which result in strong modifications; of the spectral and spatial distribution of photon fields, which in turn give rise to major changes in light-matter interactions. The strong coupling between excitons and photons is one of the manifestations of such modifications and results in the formation of coupled-mode states, two-dimensional exciton polaritons. Organic molecular compounds are very attractive materials for opto-electronics applications.