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Room temperature strong coupling from CdSeS/Zn quantum-dots embedded into atunable porous-silicon Fibonacci-conjugated array could be observed whenexciton's energy was tuned either to the photonic-edge or the defect in themiddle of the pseudo-bandgap region of the 1D cavity. Both, the photonic-edgeand the defect could be identified as topological edge modes andquasi-bound-states-in-the-continuum, where large density of states and fieldlocalization over a wider bandwidth produce a broadband Purcell enhancement,helping to optimize the coupling among the exciton and the 1D photonicquasi-crystal despite the natural difficulty to make the quantum dots topenetrate the cavity pores. A clear repulsion among polaritons, amounting toalmost 8 meV for in-plane k values when the cavity energy is larger than theexciton one (blue k-detuning), was measured when increasing the incident lightfluence, marking the potential of this non-trivial topological array forachieving polariton quantum blockade. Evidence for ultra-strong coupling, wherea shift as large as 20 meV, could be found when the defect of thepseudo-bandgap region of the cavity was tuned to the exciton.

Room-temperature polariton repulsion and ultra-strong coupling for a  non-trivial topological one-dimensional tunable Fibonacci-conjugated  porous-Silicon photonic quasi-crystal showing quasi  bound-states-in-the-continuum