We fabricated a single-crystalline rubrene microcavity using a simple solution technique and observed cavity polaritons in the microcavity at room temperature (RT). Large Rabi splitting energies were obtained from dispersion of the cavity polaritons. Furthermore, photoluminescence from the cavity polaritons was observed at RT. The findings will be of importance for the application of cavity polaritons.
We have developed a novel method of fabricating high-quality crystalline organic microcavities using a simple solution technique. Anthracene single crystals were grown from solution at room temperature in a gap of 200 nm between two joined distributed Bragg reflectors. The method is easier to perform than the conventional melting technique and the crystals have no strain caused by thermal expansion. Clear cavity polariton modes and giant Rabi splitting energies were observed as well as those in the microcavities prepared using the melting technique. The method can be applied to the fabrication of various crystalline organic microcavities. #
Herein, we have measured the phase dispersion of a cavity polariton in a single-crystalline anthracene microcavity via interference spectroscopy. Results show slow-light dispersion at the cavity polariton's lower polariton resonance, which agrees well with the transfer matrix method calculation results. According to the theoretical calculations, the slow-light dispersion's group refractive index is 24. We found that the structural dispersion due to a phenomenological photon cavity and material dispersion caused by the exciton contributed to the large group refractive index. These efforts will aid in realizing optical buffer memories for organic microcavities.
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