Abstract
We experimentally demonstrate tunable coupled cavities based upon open access zero-dimensional hemispherical microcavities. The modes of the photonic molecules are strongly coupled with quantum well excitons forming a system of tunable polaritonic molecules. The cavity-cavity coupling strength, which is determined by the degree of modal overlap, is controlled through the fabricated centre-to-centre distance and tuned in-situ through manipulation of both the exciton-photon and cavity-cavity detunings by using nanopositioners to vary the mirror separation and angle between them. We demonstrate micron sized confinement combined with high photonic Q-factors of 31 000 and lower polariton linewidths of 150 μeV at resonance along with cavity-cavity coupling strengths between 2.5 meV and 60 μeV for the ground cavity state.
Highlights
experimentally demonstrate tunable coupled cavities based upon open access zero-dimensional hemispherical microcavities
The modes of the photonic molecules are strongly coupled with quantum well excitons forming a system of tunable polaritonic molecules
which is determined by the degree of modal overlap
Summary
We demonstrate micron sized confinement combined with high photonic Q-factors of 31 000 and lower polariton linewidths of 150 leV at resonance along with cavity-cavity coupling strengths between 2.5 meV and 60 leV for the ground cavity state. The cavity resonances of the coupled cavity system are strongly coupled to QW excitons, present in a cavity region above the bottom semiconductor DBR, giving rise to hybrid light-matter eigenstates and the formation of a polaritonic molecule. The small concave mirror radius of curvature (RoC) of 6 lm gives rise to micron sized polariton confinement in the hybridised modes, which combined with the narrow polariton linewidths at resonance of 150 leV, may allow the blockade regime for coupled cavities to be reached.. The eigenenergies that describe the upper (UP) and lower (LP) polariton states are given by diagonalising the Hamiltonian of Eq (1)
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