Microcavities with crystalline organics

The main point is that organic crystals show strong optical anisotropy. Due 

In Subsection 10.2.2, the Maxwell equations in an anisotropic microcavity are discussed and some important facts concerning Coulomb and mechanical excitons are summarized. In Subsection 10.2.3 the dispersion equation of cavity polaritons is derived. Its solutions for the cases of crystals with one and two molecules in the unit cell are discussed in Subsections 10.2.4 and 10.2.5, respectively. The main results are summarized in the conclusions. 

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In the following sections of this chapter we consider in more detail the properties of excitations in organic microcavities with crystalline as well as with amorphous materials. 

For an organic crystalline monolayer it was found that the exciton-exciton kinematic interaction can be described as scattering, not by hard spheres as in 3D crystals, but as scattering by hard disks. It was shown also that, as in the case of a two-dimensional ultracold trapped atom boson gas, the excitons in a confined monolayer may behave as a dilute degenerate boson gas at low temperature. Then for a microcavity with an organic crystalline monolayer such as a resonant material the polariton-polariton kinematic interaction steming from the polariton excitonic part was derived. 

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