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Title: Multiwalled carbon nanotubes for all-optical switching
Authors: Ji, W. 
Elim, H.I. 
Keywords: Carbon nanotubes
Ultrafast optical nonlinearity
Issue Date: 2006
Citation: Ji, W., Elim, H.I. (2006). Multiwalled carbon nanotubes for all-optical switching. Proceedings of SPIE - The International Society for Optical Engineering 6352 II : -. ScholarBank@NUS Repository.
Abstract: Recently, ultrafast nonlinear optical responses of single-wall carbon nanotubes (SWCNTs) in suspensions and in films have been investigated intensively. Transient photobleaching has been observed with femtosecond laser pulses at photon energies of 0.8 - 1.1 eV (wavelengths = 1100 - 1550 nm), resonant with the lowest interband transitions of semiconducting SWCNTs. Here, we report both absorptive and refractive nonlinearities in a film of multiwalled carbon nanotubes (MWCNTs) grown mainly along the direction perpendicular to the surface of quartz substrate. Such MWCNT films are prepared by a method of plasma enhanced chemical vapor deposition. By employing Z-scans with 180-fs laser pulses at wavelengths ranging from 720 to 1550 nm, we have observed that both absorptive and refractive nonlinearities are of negative. More importantly, the degenerate pump-probe measurement reveals an ultrafast recovery time of ∼ 1 ps. In addition, we also present a demonstration that the ultrafast nonlinear optical properties can be manipulated by a hybrid system in which MWCNTs are coated with ZnO nanoparticles. At wavelengths of interest, it is known that ZnO possesses three-photon (or four-photon) absorption, which is of positive sign and can be used to balance off the negative nonlinearity of MWCNTs.
Source Title: Proceedings of SPIE - The International Society for Optical Engineering
ISBN: 0819464473
ISSN: 0277786X
DOI: 10.1117/12.689181
Appears in Collections:Staff Publications

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