Transient pump-probe data as a function of time delay for different excitation wavelengths. [(a) and (c)] Off-resonance. (b) Resonant to (12,1) (11,3), (10,5), and (9,7) nanotubes. (d) Resonant to (9,4), (8,6), and (8,7) nanotubes. The resonant chiralities were taken from the PLE data. The pump-probe signal was fitted by three-exponential decaying functions for the resonant excitation cases and two-exponential decaying functions for the off-resonant conditions.
PLE spectra of SWNTs excited from 700 to 950 nm and detected from 950 to 1650 nm. (9,4), (8,6), and (8,7) are resonantly excited at the 730 nm and (11,3), (10,5), and (9,7) from the 800 nm excitation. 750 and 830 nm correspond to off-resonant excitations.
Amplitudes (, , and ) for each decay contribution of the transient transmission signal as a function of the pump polarization angle at the resonant excitation of 800 nm.
(a) Coherent phonon oscillation at 800 nm for different pump polarization. (b) FT power spectrum at 800 nm for pump polarization of 0°. (c) Amplitude of coherent phonon oscillations of specific chiralities, (9,4) and (11,3) as a function of the pump polarization angle.
Schematic for the polarization-dependent coherent phonon oscillation and polar plot for normalized phonon amplitude as a function of the relative pump polarization angle .
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