2017-11-09 深圳六碳科技和深圳大学闫培光教授团队在Nanotechnology上发表论文：Large-area and highly crystalline MoSe2 for optica

2017年 11月9日，深圳六碳科技和深圳大学闫培光教授团队在Nanotechnology上发表论文：Large-area and highly crystalline MoSe2 for optical modulator

深圳六碳科技作为作者单位，负责二维材料的制备

Abstract
Transition metal dichalcogenides (TMDs) have been successfully used as broadband optical modulator materials for pulsed fiber laser systems. However, the nonlinear optical absorptions of exfoliated TMDs are strongly limited by their nanoflakes morphology with uncontrollable lateral size and thickness. In this work, we provide an effective method to fully explore the nonlinear optical properties of MoSe2. Large-area and high quality lattice MoSe2 grown by chemical vapor deposition method was adopted as an optical modulator for the first time. The large-area MoSe2 shows excellent nonlinear optical absorption with a large modulation depth of 21.7% and small saturable intensity of 9.4 MW cm−2. After incorporating the MoSe2 optical modulator into fiber laser cavity as a saturable absorber, a highly stable Q-switching operation with single pulse energy of 224 nJ is achieved. The large-area MoSe2 possessing superior nonlinear optical properties compared to exfoliated nanoflakes affords possibility for the larger-area two-dimensional materials family as high performance optical devices.