基于二维层状材料的激光器

Lasers Based on Two-Dimensional Layered Materials

二维过渡金属硫族化合物(TMDC)具有独特的优势,可以作为增益材料实现激光发射。TMDC材料固有的强库仑相互作用和弱的介电屏蔽效应使其具有大的激子结合能,从而有助于实现室温下稳定的激子发光,其高达6~7的折射率能够提高光约束能力,原子层表面没有悬空键,当与硅基半导体器件连接时,能够避免晶格失配。这些独特性质使其成为极具潜力的增益材料,可以与硅基微腔连接构成激光器件,原子级厚度和近红外的光谱辐射能使其与集成器件互联。本文从光学微腔的分类和激光原理,以及二维材料激光器等方面总结了近几年基于TMDC材料的激光器研究进展,并指出了当前存在的问题及展望了其发展前景。

Two-dimensional transition-metal dichalcogenides(TMDC)have unique advantages and can be used as gain materials for laser emission.The strong Coulomb interaction and weak dielectric screening effect of TMDC materials induce a large exciton binding energy to achieve stable exciton emission at room temperature.Moreover,TMDC can extensively increase the capability of light confinement owing to its high refractive index of up to 6--7.The atomic layer surface of TMDC materials has no dangling bonds,so they can avoid lattice mismatch when connected with silicon-based semiconductor devices.These unique properties render TMDC as potential gain materials that can be coupled with silicon-based microcavities to form laser devices.Furthermore,their atomic thickness and near-infrared spectral radiation ensure promising interconnection with integrated devices.This study summarizes the research progress of lasers based on TMDCs in recent years with the classification of optical microcavities and laser principles.Moreover,current challenges and their future application prospects are also discussed.