碳纳米管非线性光限幅机理的研究

Study on the Mechanism of Nonlinear Optical Limiting in Multiwalled Carbon Nanotubes

用化学气相沉积法制备了多壁碳纳米管,经扫描电镜分析得其具有较好的形貌和结构。研究了该多壁碳纳米管对波长1 064 nm激光的光限幅性质,发现该样品具有非常明显的光限幅特性,激发态吸收截面为σE=3.32×10-17cm2。应用Z-扫描(Z-scan)技术研究表明,碳纳米管的光限幅机制主要为激发态吸收。

The multiwalled carbon nanotubes （MWNTs） were synthesized by a chemical vapor deposition method and the SEM graph shows that the sample has good construe. The optical limiting properties of MWNTs were investigated with 1 064nm laser. MWNTs has perfect optical limiting property and the excite-state absorption cross-section was 3.32× 10^-17 cm^2. The experiments by Z- scan indicate that the phenomenon is mainly attributed to the excited state absorption.