Optical limiting studies of new carbon nanocomposites and amorphous Si _xN_y or amorphous SiC coated multi-walled carbon nanotubes

TY - JOUR

T1 - Optical limiting studies of new carbon nanocomposites and amorphous Si xNy or amorphous SiC coated multi-walled carbon nanotubes

AU - Elim, Hendry Izaac

AU - Chen, Weizhe

AU - Wei, J. I.

AU - Zhong, Ziyi

AU - Lin, Jianyi

AU - Meng, Gwee Chen

AU - Chin, K. C.

AU - Gohel, A.

AU - Wee, A. T.S.

AU - Chen, G. X.

AU - Hong, M. H.

PY - 2004/6

Y1 - 2004/6

N2 - 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.

AB - 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.

KW - Carbon nanoballs

KW - Coated multi-walled carbon nanotubes

KW - Optical limiting

UR - http://www.scopus.com/inward/record.url?scp=13844269110&partnerID=8YFLogxK

U2 - 10.1142/S0218863504001876

DO - 10.1142/S0218863504001876

M3 - 文章

AN - SCOPUS:13844269110

SN - 0218-8635

VL - 13

SP - 275

EP - 289

JO - Journal of Nonlinear Optical Physics and Materials

JF - Journal of Nonlinear Optical Physics and Materials

IS - 2

ER -