Observation of strong exciton–photon coupling at temperatures up to 410 K

Robust exciton-polariton effect in a ZnO whispering gallery microcavity at high temperature

“…2(d). As mentioned above, the linewidths of WG and quasi-WG LPBs remain nearly constant while temperature increases from room temperature to $550 K, which is different from the result of ZnO based distributed Bragg reflector (DBR) structure reported by Sturm et al 10 According to A. Trichet et al's theory, when temperature increases, the thermal broadening increases greatly only for polariton modes within the energy range E Xi $ E Xi À E LO (i ¼ A,B, E LO ¼ 72 meV), while those at lower energy remain virtually unaffected. 8 Here, the 92nd order of the WG LPB at room temperature is about 120 meV lower than the exciton energy ((E XA þ E XB )/2), while the 85th order at 500 K is about 150 meV lower than that at the corresponding temperature, as shown in Figs.…”

Toward polariton lasing in a zinc oxide microcavity: Design and preliminary results

“…Recent works on ZnO microcavities have reported the SCR observation up to 410K [6][7][8][9]. The next step is now to obtain a polariton laser at RT but three main enhancements are currently needed:…”

Polariton lasing in a hybrid bulk ZnO microcavity

“…Thanks to these two facts, the regime of excitonic lasing in a planar cavity is accessible and both nonlinear excitonic emission and strong coupling have been demonstrated for various ZnO-based optical resonators. [10][11][12][13][14][15][16] In this letter, we report on polariton lasing occurring in a planar microcavity embedding a bulk ZnO layer. The cavity quality factor (Q $ 300) and the in-plane photonic disorder drive the system out-of-equilibrium and to a competition between multiple localized polariton modes at the lasing threshold.…”