Although metallic nanostructures are useful for nanoscale optics, all of their key optical properties are determined by their geometry. This makes it difficult to adjust these properties independently, and can restrict applications. Here we use the absolute intensity of Rayleigh scattering to show that single-walled carbon nanotubes can form ideal optical wires. The spatial distribution of the radiation scattered by the nanotubes is determined by their shape, but the intensity and spectrum of the scattered radiation are determined by exciton dynamics, quantum-dot-like optical resonances and other intrinsic properties. Moreover, the nanotubes display a uniform peak optical conductivity of ∼8 e2/h, which we derive using an exciton model, suggesting universal behaviour similar to that observed in nanotube conductance. We further demonstrate a radiative coupling between two distant nanotubes, with potential applications in metamaterials and optical antennas.
Bibliographical noteFunding Information:
The authors thank P.L. McEuen for useful discussions, and Y.J. Kim and R. Havener for assistance with sample fabrication and numerical modelling. This work was supported by the National Science Foundation (NSF) through the Center for Nanoscale Systems, Cornell Center for Materials Research, Center for Chemical Innovation and an NSF CAREER grant. Additional funding was received from the David and Lucile Packard Foundation, Alfred P. Sloan Foundation, Camille and Henry Dreyfus Foundation, and the US Department of Defense through the Air Force Office of Scientific Research. Sample fabrication was performed at the Cornell Nanoscale Science and Technology Facility, a National Nanotechnology Infrastructure Network node.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Biomedical Engineering
- Materials Science(all)
- Condensed Matter Physics
- Electrical and Electronic Engineering