Fundamental optical properties of photonic crystal slabs in the strong coupling regime

Abstract

We report on the transmission and photoluminescence (PL) properties of semiconductor-imbedded photonic crystal slabs where the photon mode is strongly mixed with the exciton mode. The samples are prepared by incorporating PbI-based inorganic-organic layered perovskites with the large oscillator strength of excitons into periodically arranged square holes on a quartz substrate. In transmission spectra, well-pronounced dips due to the excitation of quasi-guided modes are observed, when a polystyrene layer is overcoated with an appropriate thickness on the substrate. The quasi-guided and exciton modes exhibit an anticrossing with large Rabi splitting of over 100 meV, which demonstrates the formation of polaritons via the strong coupling between these two modes. In PL spectra, we found that the polariton PL is significantly enhanced where the polariton has the largest population. Thus, the optical properties of excitons can be controlled by the electromagnetic periodic boundary condition via strong coupling with a quasi-guided mode in a photonic crystal slab.

Early stages of continuous wave experiments on cavity‐polaritons

“…The samples discussed in the last sections of the text still represent the state of the art of the present time. Nevertheless this short history of the early stages of the cavity-polaritons would not be complete without the mention of work in other material systems, such as II-VI [81,82] where the temperature dependence differs sensibly due to a different scale of the exciton binding energy and linewidths, oscillator strength, optical phonon energy, bulk active layer [83,84], organic materials [85][86][87][88][89], numerous attempts to achieve strong coupling with a collection or single quantum dots in different kind of optical cavities, just recently successful [90,91], attempts to electrically inject carriers [92], tunability [93], interest for nitrides was mentioned early but up to now results compare at best with the first generation of samples [94][95][96] [80,102].…”

Engineering a light–matter strong coupling regime in perovskite-based plasmonic metasurface: quasi-bound state in the continuum and exceptional points

“…Up to now, making use of perovskite platform, different groups have successfully demonstrated polariton Bose-Einstein condensation (i.e. polariton lasing) [32][33][34][35][36][37][38][39], laser cooling [40], ballistic propagation [33], exciton-surface plasmon polaritons [6,41], polaritonic microstructures [33,[42][43][44] and lattices [36,[45][46][47]. However, the polaritonic devices reported in these works are optically pumped.…”