Large third-order optical nonlinearity in directly synthesized single-walled carbon nanotube films.
Large third-order optical nonlinearity is observed in single-walled carbon nanotube (SWNT) films that are directly synthesized by CVD method rather than post-deposited from solution. Through z-scan method, the third-order nonlinear susceptibility (chi(3)) is measured, and the |Im chi(3)| is 1.8 x 10(-7) esu at 1064 nm, which is among the highest reported values for optical nonlinear materials. Combined with their transparent morphology and ultrafast carrier relaxation time, our results indicate the promising prospect of directly synthesized SWNT films as saturable absorbers using in mode-lock lasers or ultrafast switching materials in optical telecommunications.
Beijing National Laboratory of Condensed Matter Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.
Wenjun
W
Ma
Baohua
B
Feng
Yan
Y
Ren
Qingsheng
Q
Zeng
Zhiqiang
Z
Niu
Jinzhu
J
Li
Xiaoxian
X
Zhang
Haibo
H
Dong
Weiya
W
Zhou
Sishen
S
Xie