Abstract
We present a new kind of optical cavity called laterally patterned microcavity bounded by two parallel subwavelength dielectric gratings (SDGs) on one side and by distributed Bragg reflectors (DBRs) on the other side. In addition to its diffractive properties, the SDG is characterized by a large reflection spectrum and a very high reflectivity. In this case, the cavity eigenmodes will be diffracted modes, so making possible to excite not only one cavity mode as in the case in the planar DBR-DBR microcavity but several modes of different diffraction orders. Diffraction induced by the DSGs is consequently used to study the coupling of these cavity modes with an exciton confined in a quantum well (QW) localized in an anti-node of the cavity. With the semi-classical theory and the scattering matrix method, the dispersion equation of a confined bidimensional exciton-polariton in this microcavity was formulated bringing out a coupling of more than two damped harmonic oscillators. The number of DBRs required to realize the spontaneous emission and the strong coupling regime exciton-cavity mode is significantly lower than those in the planar or DBR-DBR microcavities. The presence of SDGs as mirrors has induced in the cavity and near the exciton resonance energy, Rabi splittings at specific incidence angles of the light beam. The computed time resolved transmission spectra have shown an increase in the exciton-polariton lifetime inside the microcavity.
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