4 research outputs found
Shaping potential landscape for organic polariton condensates in double-dye cavities
We investigate active spatial control of polariton condensates independently
of the polariton-, gain-inducing excitation profile. This is achieved by
introducing an extra intracavity semiconductor layer, non-resonant to the
cavity mode. Saturation of the optical absorption in the uncoupled layer
enables the ultra-fast modulation of the effective refractive index and,
through excited-state absorption, the polariton dissipation. Utilising these
mechanisms, we demonstrate control over the spatial profile and density of a
polariton condensate at room temperature
Nano-second exciton-polariton lasing in organic microcavities
Organic semiconductors are a promising platform for ambient polaritonics. Several applications, such as polariton routers, and many-body condensed matter phenomena are currently hindered due to the ultra-short polariton lifetimes in organics. Here, we employ a single-shot dispersion imaging technique, using 4 ns long non-resonant excitation pulses, to study polariton lasing in a λ/2 planar organic microcavity filled with BODIPY-Br dye molecules. At a power threshold density of 1.5 MW/cm 2, we observe the transition to a quasi-steady state, 1.2 ns long-lived, single-mode polariton lasing and the concomitant superlinear increase in photoluminescence, spectral line-narrowing, and energy blueshift.</p
Dataset for: Nano-second exciton-polariton lasing in organic microcavities
The experimental dataset used to create the figures in the paper A Putintsev, A Zasedatelev, KE McGhee, T Cookson, K Georgiou, D Sannikov, DG Lidzey, PG Lagoudakis, (2020). Nano-second exciton-polariton lasing in organic microcavities</span
Polariton condensation in an organic microcavity utilising a hybrid metal-DBR mirror
We have developed a simplified approach to fabricate high-reflectivity mirrors suitable for applications in a strongly-coupled organic-semiconductor microcavity. Such mirrors are based on a small number of quarter-wave dielectric pairs deposited on top of a thick silver film that combine high reflectivity and broad reflectivity bandwidth. Using this approach, we construct a microcavity containing the molecular dye BODIPY-Br in which the bottom cavity mirror is composed of a silver layer coated by a SiO2 and a Nb2O5 film, and show that this cavity undergoes polariton condensation at a similar threshold to that of a control cavity whose bottom mirror consists of ten quarter-wave dielectric pairs. We observe, however, that the roughness of the hybrid mirror—caused by limited adhesion between the silver and the dielectric pair—apparently prevents complete collapse of the population to the ground polariton state above the condensation threshold