Abstract

We propose and demonstrate an approach for tailoring the Raman response of an individual single-walled carbon nanotube (SWNT) by employing the optical vortex as the excitation. Specifically, we observe the blueshifts of radial breathing mode and $G$ mode when the topological charge of the vortex beam is increased from 0 to 5. Further theoretical analysis yields that the optical absorption and the corresponding laser heating effect of SWNT are inversely proportional to the topological charge of the optical vortex. Such a decrease in the laser heating effect weakens the softening of C–C bonds, leading to the blueshifts of Raman modes.

© 2017 Optical Society of America

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