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(a) High magnification SEM image, (b) diameter distribution with an average diameter of and (c) UV-visible absorption spectrum of the MWCNT film grown on quartz substrate with an average film thickness of .
-scans of the MWCNT film on quartz measured at 720 and by using -laser pulses focused with a minimum waist of . The solid lines are the best-fit curves calculated by using the -scan theory reported in Ref. 21. The filled and open circles in (a) and (c) are the -scans without aperture, while the filled and open circles in (b) and (d) are the -scans with aperture.
Irradiance independence of and values measured at .
Degenerate -time-resolved pump–probe measurements of the MWCNT film performed at with three different pump irradiances. The top and middle curves are shifted vertically for clear presentation. The solid lines are two-exponential fitting curves with and .
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