Abstract
Room-temperature luminescence of exciton polaritons was observed from InGaN/GaN quantum wells (QWs) sandwiched in Fabry–Perot (FP) microcavity (MC). Angle resolved photoluminescence measurements revealed unambiguous anti-crossing behavior, indicating strong coupling between excitons and photons. The Rabi splitting value varied from 40 meV–130 meV, depending on the excitation power, which was larger than previous publications. This large Rabi splitting value was ascribed to our high MC quality factor (Q > 3000) and large oscillator strength induced by coupled QWs structure. The sensitive dependence of the Rabi splitting in InGaN QWs on excitation power indicates that exciton-exciton scattering mechanism plays an important role in exciton- photon coupling.
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