Publication date: 15th November 2022
Optical microcavities, also known as microresonators, are a class of optical structures providing a versatile approach to engineering light matter interactions. These submicrometric structures are able to confine light in small volumes for a relatively long time. They have intrinsic natural resonance modes that can radically modify the local photonic density of states (LPDOS) and can be designed by manipulating their component materials, dimensions and geometry [1]. In particular, the coupling of the LPDOS with optical emitters can give rise to broad range of outstanding applications, like laser or polariton condensates [2].
From the material point of view, Lead-free perovskites, and in particular tin-based perovskites, have recently become as promising non-toxic active materials to be incorporated in optical resonators. Their advantages include straightforward fabrication by chemical synthesis together with impressive optoelectronic properties (i.e. excellent absorption and emission efficiencies, high electron mobilities, ...) [3]. Indeed, we recently demonstrated that the integration of high quality FASnI3 (FA, formamidinium) lead-free perovskite thin films in waveguides gives rise to the generation of optical amplification with extraordinary low stimulated emission thresholds [4] and even random lasing [5].
In this work, the FASnI3 thin films are incorporated in an optical microcavity that consists of two reflective mirrors sandwiching the active material. The geometrical parameters of the device are carefully designed to obtain a cavity mode at the photoluminescence band and a strong light confinement of the electric field in the optical architecture. As a result, the device demonstrates lasing action when it is optically pumped with thresholds smaller than 1 µJ/cm2. These results can pave the road towards the development of a future ecofriendly lasers and photonics technology.
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