Recently, the Institute of Physics and Energy of Hunan University has realized the construction of high-quality red, green and blue multi-color wavelength-adjustable inorganic halide perovskite nanowire laser pointer arrays, and for the first time through component control to achieve excitons in nanowires - Effective regulation of photon coupling strength.
Inorganic halide perovskite nanowires have potential applications in the field of integrated photonics devices such as micro/nanoscale lasers and photodetectors due to their high efficiency of light absorption and light emission, and have attracted much attention in recent years. At present, the potential physical mechanism of laser formation and the effective regulation of the interaction intensity of light and matter in nanowires have not been realized, and it has become the main bottleneck hindering the application of such nanostructures in future high-performance integrated photonic devices.
In response to this problem, Wang Xiaoxia, a researcher in nanophotonics and integrated devices led by Prof. Pan Anlian, was able to control the ultra-long perovskite nanowires (CsPbX3, X=Cl, Br) on the M-plane sapphire substrate for the first time. , I), and on the basis of the application of high-performance photodetector (JACS 2017), the research group has realized a large number of high-quality CsPbX3 nanowire ordered arrays of controllable preparations through continuous and extensive experimental accumulation and verification. And using these nanowires to construct a red, green and blue multi-color wavelength-adjustable nanowire laser pointer array with low threshold, high quality factor and high linear polarization at room temperature; through systematic study of lasing mode, it is found in At high pumping energies, there are exciton-polarized excitons formed by strong exciton-photon coupling in the nanowire microcavity, ie the lasing modes include photonic modes and polariton modes. And further use the exciton-photon coupling model to study the energy-wave vector dispersion relationship of the model and realize it through component control CsPbX3 nanowires of exciton - coupling intensity for effective control. This work reveals the physical mechanism of optical gain in CsPbX3 nanowires, providing an important theoretical model and experimental basis for the future research and application of polaritonics.