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Title: Optical limiting studies of new carbon nanocomposites and amorphous Si xNy or amorphous SiC coated multi-walled carbon nanotubes
Authors: Elim, H.I. 
Chen, W.
Wei, J.I. 
Zhong, Z. 
Lin, J. 
Meng, G.C.
Chin, K.C. 
Gohel, A.
Wee, A.T.S. 
Chen, G.X.
Hong, M.H.
Keywords: Carbon nanoballs
Coated multi-walled carbon nanotubes
Optical limiting
Issue Date: Jun-2004
Citation: Elim, H.I., Chen, W., Wei, J.I., Zhong, Z., Lin, J., Meng, G.C., Chin, K.C., Gohel, A., Wee, A.T.S., Chen, G.X., Hong, M.H. (2004-06). Optical limiting studies of new carbon nanocomposites and amorphous Si xNy or amorphous SiC coated multi-walled carbon nanotubes. Journal of Nonlinear Optical Physics and Materials 13 (2) : 275-289. ScholarBank@NUS Repository.
Abstract: By using fluence-dependent transmission measurement with nanosecond laser pulses, we have studied optical limiting (OL) properties of new carbon nanocomposites as well as amorphous SixNy or amorphous SiC coated carbon nanotubes suspended in distilled water. The observed nonlinearity at 532 nm contributed to OL performance of the carbon nanocomposites or carbon nanoballs (CNBs) is suggested to have its origin in the optically induced heating or scattering effects. It is found that when the linear transmittance of the CNBs is less than or equal to 70%, the intensity-dependent transmission of the CNBs is comparable to that of C60. While at 80% linear transmittance, CNBs possess better OL behavior than that of C60. These findings strongly support a potential application of CNBs for all laser protection devices. We have also observed OL effects in the amorphous silicon nitride (a-SixNy) and amorphous silicon carbide (a-SiC) coated multi-walled carbon nanotubes (MWNTs) at wavelengths of 532 and 1064 nm, and found that their OL performances are slightly poorer than that of their parent MWNTs. The possible sources of thickness-dependent OL effects of a-SixNy and a-SiC coated MWNTs are discussed.
Source Title: Journal of Nonlinear Optical Physics and Materials
ISSN: 02188635
DOI: 10.1142/S0218863504001876
Appears in Collections:Staff Publications

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