[24p-E102-1~18] 17.1 Carbon nanotubes & other nanocarbon materials

[24p-E102-1] Interaction between Phonons in a Single-Walled Carbon Nanotube and Near-field light of an Optical Nanofiber

〇Masaru Irita¹, Uchikawa Taro¹, Yamamoto Takahiro¹, Homma Yoshikazu¹, Mark Sadgrove¹ (1.Tokyo Univ. of Science)

Keywords:single-walled carbon nanotubes, raman, near-field light

The Raman scattering spectrum reflects the state of lattice vibration (phonons) in a material. Phonons contribute to the heat conduction of single-walled carbon nanotubes (SWCNTs), which are one-dimensional materials with a diameter of about 1 nm. In this study, we developed a measurement system to study the interaction between SWCNT phonons and near-field light. The sample used was a nanofiber on which an aqueous solution containing SWCNTs was applied. Raman spectra were obtained in the far-field by passing an excitation laser of 785 nm through the nanofiber. Raman measurements were performed at intervals of 5 µm over the 4 mm length of the nanofiber region. While scattered light originated from not only SWCNTs but also dust particles, the observation of the Raman G-band allowed us to identify SWCNTs. A high G-band intensity with almost no scattered light indicated the presence of pure SWCNTs. We scanned the nanofiber surface for isolated SWCNTs this principle and performed detailed analyses. In the presentation, we will also discuss the interaction between SWCNTs and polarized light passing though the nanofiber.