Ultrafast switching time and third order nonlinear coefficients of microwave treated single walled carbon nanotube suspensions
| Title | Ultrafast switching time and third order nonlinear coefficients of microwave treated single walled carbon nanotube suspensions |
| Publication Type | Journal Article |
| Year of Publication | 2009 |
| Authors | Kamaraju, N, Kumar, S, Karthikeyan, B, Kakade, BA, Pillai, VK, Sood, AK |
| Journal | Journal of Nanoscience and Nanotechnology |
| Volume | 9 |
| Issue | 9 |
| Pagination | 5550-5554 |
| Date Published | SEP |
| ISSN | 1533-4880 |
| Keywords | Nonlinear Optical Coefficients, SWCNT, Ultra-Fast Switching |
| Abstract | Microwave treated water soluble and amide functionalized single walled carbon nanotubes have been investigated using femtosecond degenerate pump-probe and nonlinear transmission experiments. The time resolved differential transmission using 75 femtosecond pulse with the central wavelength of 790 nm shows a bi-exponential ultrafast photo-bleaching with time constants of 160 fs (130 fs) and 920 fs (300 fs) for water soluble (amide functionalized) nanotubes. Open and closed aperture z-scans show saturation absorption and positive (negative) nonlinear refraction for water soluble (amide functionalized) nanotubes. Two photon absorption coefficient, beta(0) similar to 250 cm/GW (650 cm/GW) and nonlinear index, gamma similar to 15 cm(2)/pW (-30 cm(2)/pW) are obtained from the theoretical fit in the saturation limit to the data for two types of nanotubes. |
| DOI | 10.1166/jnn.2009.1184 |
| Type of Journal (Indian or Foreign) | Foreign |
| Impact Factor (IF) | 1.351 |