We have theoretically studied the resonant radiation force exerted on single-walled carbon nanotubes (SWCNs) by taking into account the excitonic effect under the effective-mass approximation. When a light frequency is close to an exciton level, the radiation force becomes significantly large even at room temperature for conventional laser intensities in optical manipulation. The peak positions in radiation force spectra are sensitive to the tube diameter and light polarization. Furthermore, the chirality dependence on exciton for similar diameter is relatively large. Therefore, the selective sorting and trapping of SWCNs with a desired specific structure is possible by tuning the applied field frequency.
Friday, October 16, 2009
Size- and orientation-selective optical manipulation of single-walled carbon nanotubes: A theoretical study
Hiroshi Ajiki, Takuya Iida, Takahiro Ishikawa, Seiji Uryu, and Hajime Ishihara
We have theoretically studied the resonant radiation force exerted on single-walled carbon nanotubes (SWCNs) by taking into account the excitonic effect under the effective-mass approximation. When a light frequency is close to an exciton level, the radiation force becomes significantly large even at room temperature for conventional laser intensities in optical manipulation. The peak positions in radiation force spectra are sensitive to the tube diameter and light polarization. Furthermore, the chirality dependence on exciton for similar diameter is relatively large. Therefore, the selective sorting and trapping of SWCNs with a desired specific structure is possible by tuning the applied field frequency.
We have theoretically studied the resonant radiation force exerted on single-walled carbon nanotubes (SWCNs) by taking into account the excitonic effect under the effective-mass approximation. When a light frequency is close to an exciton level, the radiation force becomes significantly large even at room temperature for conventional laser intensities in optical manipulation. The peak positions in radiation force spectra are sensitive to the tube diameter and light polarization. Furthermore, the chirality dependence on exciton for similar diameter is relatively large. Therefore, the selective sorting and trapping of SWCNs with a desired specific structure is possible by tuning the applied field frequency.
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