High-sensitivity polarization modulation reflectance spectroscopy of cavity polaritons in a ZnO microcavity

Abstract

We report that polarization modulation reflectance (PMR) spectroscopy is highly sensitive to the cavity polaritons in a ZnO microcavity with HfO2/SiO2 distributed Bragg reflectors. We demonstrate that the cavity-polariton dispersion, even in the energy region of strong absorption by exciton continuum states, is clearly observed by PMR spectroscopy. The PMR spectra were quantitatively analyzed by a transfer-matrix method taking into account three types of excitons labeled A, B, and C. Line-shape analysis of the PMR spectra indicates that the anisotropy of the excitonic transitions is considerable in treating the cavity polariton in the ZnO microcavity.

Enhanced waveguide-type ultraviolet electroluminescence from ZnO/MgZnO core/shell nanorod array light-emitting diodes via coupling with Ag nanoparticles localized surface plasmons

“…[43][44][45][46] Recently, this novel exciton-photon complex has also been found in ZnO NRs and their waveguide-type PL transmission process was studied in detail. [47][48][49] The ZnO polaritons may be present in our ZnO/MgZnO CS-NRs because of the coexistence and interactions between a mass of excitons and photons in the micro-nano-sized NR cavity, whose formation is also suggested by the very short luminescence lifetime, 50,51 as discussed below. The polariton can also act as an effective luminescence center with similar energy to the exciton recombination.…”

“…[47][48][49] The ZnO polaritons may be present in our ZnO/MgZnO CS-NRs because of the coexistence and interactions between a mass of excitons and photons in the micro-nano-sized NR cavity, whose formation is also suggested by the very short luminescence lifetime, 50,51 as discussed below. [47][48][49] The ZnO polaritons may be present in our ZnO/MgZnO CS-NRs because of the coexistence and interactions between a mass of excitons and photons in the micro-nano-sized NR cavity, whose formation is also suggested by the very short luminescence lifetime, 50,51 as discussed below.…”

“…The deposition was performed at 20 Pa O 2 pressure and 500 °C substrate temperature, and the growth time was used to control the MgZnO thickness. [47][48][49] The ZnO polaritons may be present in our ZnO/MgZnO CS-NRs because of the coexistence and interactions between a mass of excitons and photons in the micro-nano-sized NR cavity, whose formation is also suggested by the very short luminescence lifetime, 50,51 as discussed below. 28 Transmission electron microscopy (TEM) observation ( Fig.…”

Transparent Ultrathin Metal Electrode with Microcavity Configuration for Highly Efficient TCO-Free Perovskite Solar Cells

“…Several assumptions are used in the calculations, for example, every layer is homogenous and uniform, interfaces are parallel and flat compared to the wavelength of the light and the light in the device can be described by plane waves. In some materials, the anisotropy of the refractive index could affect the device performance greatly [34]. However, this is not an important issue in perovskite materials.…”