Nano-spectroscopy of Individual Single Walled Carbon Nanotubes

1
Nano-spectroscopy of Individual Single Walled
Carbon Nanotubes

• Measure single, unperturbed nanotube
• Determine fundamental optical property
• Excitonic versus van Hove singularity
• Contact to measure strain, conductivity

2
Resonant Raman Scattering from a single CNT
Lattice vibrations
?scattered
?laser
Energy and momentum conservation
3
Resonant Raman Scattering from a single CNT
Raman map of Radial Breathing Mode
One nanotube, resonant with BOTH incoming and
outgoing laser
Raman intensity enhancement over trench
4
AFM Induced Strain
Metal Pads

• Tubes are strained by pushing with AFM tip
• Raman spectra measured before and after strain

Laser spot
Cronin, et. al, PRL, 93 (2004)
5
Comparison of Confocal to Tip-Enhanced in Raman
Microscopy of Carbon Nanotubes