Saturable absorption of multi-walled carbon nanotubes/hybrid-glass composites

被引：26

作者：

Pokrass, Mariana ^{[1
,3
]}

Burshtein, Zeev ^{[2
]}

Gvishi, Raz ^{[1
]}

Nathan, Menachem ^{[3
]}

机构：

[1] Soreq NRC, Div Appl Phys, Photon Mat Grp, IL-81800 Yavne, Israel

[2] Ben Gurion Univ Negev, Dept Mat Engn, IL-84105 Beer Sheva, Israel

[3] Tel Aviv Univ, Sch Elect Engn, Dept Phys Elect, IL-69978 Tel Aviv, Israel

来源：

OPTICAL MATERIALS EXPRESS | 2012年 / 2卷 / 06期

关键词：

OPTICAL LIMITING PROPERTIES; FIBER LASER; NONLINEARITIES; NANOCOMPOSITES; DYNAMICS; FILM;

D O I：

10.1364/OME.2.000825

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The saturated optical absorption of multi-walled carbon nanotube (MWNT)-doped hybrid-glass composites was studied at 1064 nm with nanosecond long pulses using the Z-scan technique. Increased transmission was demonstrated for high intensity pulses. The results were modeled for the limiting cases of a slow or a fast saturable absorber, both referring to a three-level system. The ground-state absorption cross section was estimated as 2.3x10(-18) cm(2), in good agreement with that of a single carbon atom. The excited state absorption cross section for carbon nanotubes (CNTs) was estimated for the first time as 6.9x10(-19) cm(3). The absorber's density of 2.8x10(18) cm(-3) is smaller by approximately a factor of 5 compared to the nominal density of carbon atoms incorporated into the glass. This could be a result of the broad band-like states formation in the MWNTs. The above figures were obtained by assuming that the excited state decay time was longer than the pulse duration of similar to 1 ns. (C)2012 Optical Society of America

引用

页码：825 / 838

页数：14