講演情報
[20p-A602-10]Determination of in- and out-of-plane complex refractive index spectra of single-chirality carbon nanotube membranes
〇Hengkai Wu1, Taishi Nishihara1, Akira Takakura1, Kazunari Matsuda1, Takeshi Tanaka2, Hiromichi Kataura2, Yuhei Miyauchi1 (1.Kyoto Univ. IAE, 2.AIST)
キーワード：
Carbon nanotube、Optical properties、Membrane
Single-walled carbon nanotube (SWCNT) membranes composed of a specific nanotube structure (chirality) are attractive materials for photonic and opto-thermal applications because SWCNTs exhibit sharp and chirality-dependent excitonic resonance with high temperature robustness. As quasi-1D material, an SWCNT exhibits significantly different optical response to the light with polarization parallel and perpendicular to the nanotube axis. Thus, their membranes (3D assemblies of SWCNTs with few of them oriented vertically) are expected to exhibit anisotropic optical responses depending on the light propagating direction. However, despite well-clarified response of an individual SWCNT, the anisotropic complex refractive index spectra of SWCNT membranes remain unclarified, hindering the prediction of angle-dependent optical responses and the design of SWCNT-based devices for the applications above.
Here, we report in- and out-of-plane complex refractive index spectra of a single-chirality (6,5) SWCNT membrane, as examined using polarization- and angle-resolved reflection spectroscopy. We determined the in-plane and out-of-plane complex refractive index spectra from the angle dependence of s- and p-polarized light respectively. We found that the out-of-plane refractive index is almost constant (~1.9) comparing to the wavy in-plane one, and the small contribution from the transverse exciton resonance is indispensable for properly predicting angle-dependent optical responses of the membrane. The complete knowledge on both in- and out-of-plane complex refractive index spectra of single-chirality SWCNT membrane facilitates the design of precise and diverse photonic and thermo-optic devices based on SWCNTs.
Here, we report in- and out-of-plane complex refractive index spectra of a single-chirality (6,5) SWCNT membrane, as examined using polarization- and angle-resolved reflection spectroscopy. We determined the in-plane and out-of-plane complex refractive index spectra from the angle dependence of s- and p-polarized light respectively. We found that the out-of-plane refractive index is almost constant (~1.9) comparing to the wavy in-plane one, and the small contribution from the transverse exciton resonance is indispensable for properly predicting angle-dependent optical responses of the membrane. The complete knowledge on both in- and out-of-plane complex refractive index spectra of single-chirality SWCNT membrane facilitates the design of precise and diverse photonic and thermo-optic devices based on SWCNTs.