二维黑磷纳米片光学特性与光子器件研究

Two-dimensional materials having excellent non-linear optical properties, have important applications in photonics, optical communications, optical sensing and other areas, which has become a hot topic of nonlinear optics and materials science. Black phosphorus, a novel two-dimensional material with unique properties and bandgap. Current research on black phosphorus focused on the electrical properties, few studies have reported its nonlinear optical properties, and yet there is method of preparing a large area of the two-dimensional materials.Thus, solve the above problems, the present project intends to prepare large area of black phosphorus nanosheets, study their nonlinear optical properties and design correspondingly photonic devices. First, master the large area of black phosphorus nanosheets synthetic techniques; secondly, measuring and determining the nonlinear optical properties of large area of black phosphorus nanosheets; thirdly, develop functional photonic devices based on two-dimensional black phosphorus, such as ultra-fast mode - locked device, high nonlinear saturable absorber and so on. The develop functional photonic devices for ultrafast fiber lasers, it will achieve less than 100 fs ultrashort pulse repetition frequency and ultra-high pulse laser output. this project is carried out, it not only expands productions of two-dimensional materials, but also makes the applications of two-dimensional black phosphorus be extended to the nonlinear optical field, promoting the development of ultrafast laser technology has important significance.

二维材料具有优异的非线性光学特性，在光子技术、光通信、光传感等领域中有重要应用价值，因而成为了非线性光学及材料科学领域的研究热点。黑磷，一种新型的二维材料，具有独特的带隙及性质。目前对黑磷的研究主要集中在电性能上，对它的非线性光学特性研究鲜有报道，且仍未有制备大面积二维材料的方法。因此，针对以上问题，本项目拟开展大面积黑磷纳米片的制备、研究其非线性光学特性与光子器件的研究工作。首先，掌握大面积黑磷纳米片的合成技术；其次，测量和判定大面积黑磷纳米片的非线性光学特性；再次，研制功能性二维黑磷光子器件，如超快锁模器、高非线性可饱和吸收器等；将研制的二维黑磷光子器件用于超快光纤激光器中，实现小于100fs超短脉冲和超高重频脉冲等激光输出。本项目的开展，不仅拓展了二维材料的制备方法，还将二维黑磷材料的应用研究拓展到非线性光学领域，对推动超快激光技术的发展有着重要意义。

黑磷，作为一种具有可调节直接带隙、高载流子迁移率和显著的各向异性光学特性等优越特性的新型二维材料，在材料领域以及光电器件领域展示着其独特的魅力。然而，BP纳米片一直很难制备。目前，通过机械剥离法（如透明胶带撕分法）、化学气相沉积法等技术，学者们已经制备出片状的BP材料。但是，机械剥离法制备的片状BP的产率较低，不适合用来生产商业应用性材料，且操作繁琐、耗时长；而化学气相沉积法制备的BP片的量非常少，且不易重复。针对此问题，本项目以黑磷作为研究对象，分别开展了大面积黑磷纳米片的可控制备、非线性光学特性和光子功能器件的研究。通过改良的液相剥离法可获得尺寸可控、单分散性好的大面积BP纳米片，实现BP纳米片的低成本、大批量生产。同时，通过自行搭建的z扫描系统实现了大面积黑磷纳米片及其异质结非线性光学性质的探究，并根据这些非线性光学性质，成功的实现了大面积黑磷纳米片及其异质结在超快光子学中的应用。.本项目已经达到预期目标，并完成了任务指标，发表学术论文7篇在Laser Photonics Rev.、Small、J. Mater. Chem. C、Adv. Optical Mater.、Nanoscale、Optical Materials等期刊上，申请发明专利4项目，授权发明专利1项。