Electrical polarization switching of perovskite polariton laser
Karolina Łempicka‐Mirek, Mateusz Król, Luisa De Marco, Annalisa Coriolano, Laura Polimeno, Ilenia Viola, Mateusz Kędziora, Marcin Muszyński, Przemysław Morawiak, Rafał Mazur, Przemysław Kula, Wiktor Piecek, Piotr Fita, D. Sanvitto, Jacek Szczytko, Barbara Piętka
Abstract
Abstract Optoelectronic and spinoptronic technologies benefit from flexible and tunable coherent light sources combining the best properties of nano‐ and material‐engineering to achieve favorable properties such as chiral lasing and low threshold nonlinearities. In this work we demonstrate an electrically wavelength‐ and polarization‐tunable room temperature polariton laser due to emerging photonic spin–orbit coupling. For this purpose, we design an optical cavity filled with both birefringent nematic liquid crystal and an inorganic perovskite. Our versatile growth method of single CsPbBr 3 inorganic perovskite crystals in polymer templates allows us to reach strong light–matter coupling and pump‐induced condensation of exciton–polaritons resulting in coherent emission of light. The sensitivity of the liquid crystal to external voltage permits electrical tuning of the condensate energy across 7 nm; its threshold power, allowing us to electrically switch it on and off; and its state of polarization sweeping from linear to locally tilted circularly polarized emission.