Fig. 1: Microcavity phonoritons.
From: Microcavity phonoritons – a coherent optical-to-microwave interface
a Sketch of a structured MC, which consists of a spacer embedding quantum wells (QWs) sandwiched between acousto-optic distributed Bragg reflectors (aoDBRs). The μm-wide and nm-high mesa within the spacer provides lateral confinement potential (the trap depicted by the yellow curve) for polaritons and phonons. The latter are injected optically or using a ring-shaped piezoelectric bulk acoustic wave resonator (BAWR). The phonons non-adiabatically modulate the discrete polariton energy levels (horizontal dashed yellow line) to form sidebands (dashed green lines). b Schematic representation of the relevant energy diagrams realized in the experiment. Full description is in the text. PExc is the optical excitation power; PThs is the condensation threshold power; GS and ES designate the trap ground and excited state, respectively; RF Off and RF On designate the conditions with the radio-frequency driving of the BAWR off and on, respectively. c Spatially and energy-resolved emission spectrum of trap T2 under weak non-resonant excitation. d Spatially integrated spectra of the same trap below the threshold (black line) and in the BEC regime (red line). e Spectrum of trap T1 GS as the function of the optical excitation power (PExc) normalized to the threshold power (PThs = 60 mW). The levels are designated L, M and U for the lower, middle and upper one, respectively. f The splitting between the L and U states (ΔE↑↓) and between the M and U states (δ↑↑) as the function of PExc/PThs. Profiles of the map in (e) for PExc/PThs = 1.8 in (g) and PExc/PThs = 2.9 in (h). i Spectrum for PExc/PThs = 2.9 and under piezoelectric excitation of phonons with the frequency \({f}_{{{{{{{{\rm{LA}}}}}}}}}^{(3\lambda )}\). The error bars in (f) correspond to the standard error of the Gauss function used to fit the corresponding peaks.
