Abstract
We report on the room temperature polariton lasing and photon lasing in a ZnO-based hybrid microcavity under optical pumping. A series of experimental studies of the polariton lasing (exciton-photon detunings of δ = -119 meV) in the strong-coupling regime are discussed and compared to a photon lasing (δ = -45 meV) in the weak-coupling regime obtained in the same structure. The measured threshold power density (31.8 kW/cm2) of polariton lasing is one order of magnitude lower than that of the photon lasing (318.2 kW/cm2). In addition, the comparison between polariton lasing and photon lasing is done in terms of the linewidth broadening, blue-shift of the emission peak, and polarization.
Highlights
Semiconductor microcavities (MCs) are powerful in controlling interaction between light and matter
We present ZnO polariton lasing at Room temperature (RT) under optical pumping and compare the differences of the optical properties between polariton and photon lasers achieved in the same structure at different exciton-photon detunings
We have demonstrated RT polariton lasing in a ZnO-based hybrid MC
Summary
Semiconductor microcavities (MCs) are powerful in controlling interaction between light and matter. In a semiconductor MC, strong interaction between excitons and photons would produce new admixed quasiparticles, called exciton-polaritons [1]. Polaritons have a very light effective mass (typically 10 8 times the hydrogen atom), have controllable energymomentum dispersion curves [2], and follow bosonic statistics at low densities. The radiative decay of polaritons from the condensate creates laser-like coherent light, termed polariton lasers. Electronic population inversion is not necessary in such polariton lasers, as compared to conventional lasers, leading to ultra-low threshold coherent light sources. The extremely small effective mass of polaritons enables polariton condensation at higher critical temperatures compared to atomic system such as Sodium gas (Tc = 2μK) [15], which is crucial for practical applications
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