Cavity polariton dispersion of a single‐crystalline anthracene film embedded in a microcavity

Abstract

We study anisotropic behavior of cavity polaritons in an organic microcavity composed of a single crystalline anthracene film grown into the gap of the Fabry‐Perot cavity by a method through capillary action. The anisotropic response of the cavity polariton appeared on the spectra depending on the linear polarized directions; two kinds of the polarization correspond to the principal axes of anthracene crystal. Transmission spectra were measured with various thickness of the anthracene film. The peak‐shift of the lower polariton mode depending on the thickness was obviously observed, whereas that of the upper polariton mode was not clearly observed be cause of the complicated shape of the spectra. This behavior for the upper polariton mode was analyzed on the basis of the convolution between the spectra of the cavity mode and the absorption due to the vibronic transition in anthracene. Cavity‐polariton dispersion as a function of thickness was obtained from peak‐shift on the spectra. Each thickness was determined by spectral fitting through calculation using the transfer matrix theory. Large vacuum Rabi splitting energies of this system were obtained from the dispersion as 0.20 and 0.34 eV for two kinds of the polarizations. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Cavity Polaritons in a Single-Crystalline Organic Microcavity Prepared at Room Temperature Using a Simple Solution Technique

“…The results shown in Table II were in good agreement with those of the crystalline anthracene microcavities fabricated by the conventional melting technique. [11][12][13] Thus, we have shown that the clear cavity-polariton modes and the giant Rabi splitting energies are observed even for crystalline anthracene microcavities prepared using the solution technique. The solution technique can be applied to the fabrication of various crystalline organic microcavities.…”

“…8,9) Although most reports have focused on microcavities including active layers of disordered mixtures such as J aggregates or organic molecules in a host matrix, crystalline organic microcavities have also been recently investigated in several reports. [10][11][12][13][14][15] In these works, Rabi splitting energies of up to $300 meV in single-crystalline anthracene microcavities were reported. [11][12][13] In addition, polariton lasing at RT has also been realized recently in crystalline organic microcavities.…”

“…[10][11][12][13][14][15] In these works, Rabi splitting energies of up to $300 meV in single-crystalline anthracene microcavities were reported. [11][12][13] In addition, polariton lasing at RT has also been realized recently in crystalline organic microcavities. 14,15) In the microcavities, crystalline anthracene films were grown using a melting process at 240 C in nanoscale gaps between two joined distributed Bragg reflectors (DBRs).…”

“…It was found that the thicknesses of the crystalline anthracene films grown in the gap were identical to the widths of the gaps, indicating that the crystalline anthracene films completely filled the gaps, and confirming that singlecrystalline anthracene microcavities were fabricated using the simple solution technique for the first time. The solution technique is easier to perform than the melting process, [10][11][12][13][14][15][16] and the crystalline films have no strain because the preparation process takes place at RT. Figure 2 shows polarized absorption spectra of a singlecrystalline anthracene film grown using the same method in the gap between the two quartz glass plates.…”

Optical Properties of Molecular Crystals: The Effect of Molecular Packing and Polymorphism

“…Besides ASE and random lasing, some studies have also been reported on the coupling of excitons with photons in microcavity structureswhich is a rapidly growing field of research, in particular as far as strong coupling phenomena are concerned, which may lead to novel laser devices such as the polariton laser (Klaers et al 2010). Strong exciton-photon coupling has been demonstrated in microcavities of single crystal and thin film anthracene (Kena-Cohen et al 2008;Kondo et al 2009Kondo et al , 2008. More recently, Kéna-Cohen and Forrest observed polariton lasing at room temperature from a microcavity containing melt-grown anthracene single-crystal, with a threshold lower than the estimated threshold for conventional lasing in the same system (Kéna-Cohen et al 2010).…”