Waveguide coupled cavity-enhanced light emission from individual carbon nanotubes

TL;DR

This paper reports the integration of a single-walled carbon nanotube light emitter with a microcavity and waveguide, enhancing emission at telecom wavelengths and demonstrating potential for on-chip photonic applications.

Contribution

It introduces a dry transfer method for positioning individual carbon nanotubes onto nanobeam cavities, achieving efficient waveguide-coupled light emission at telecom wavelengths.

Findings

Enhanced emission at cavity resonance

Narrow linewidth of less than 1.3 nm

Off-resonance rejection of approximately 17 dB

Abstract

We demonstrate an individual single-walled carbon nanotube light emitter integrated onto a microcavity and a waveguide operating in the telecom wavelength regime. Light emission from the carbon nanotube is enhanced at the cavity resonance and is efficiently extracted from the waveguide facet. We have transferred carbon nanotubes to a nanobeam cavity with a dry process, ensuring that an individual carbon nanotube is used. The guided light emission from a chirality-identified single carbon nanotube has a narrow linewidth of less than 1.3 nm and an off-resonance rejection of $\sim$17 dB. The waveguide-coupled device configuration is compatible with fully integrated on-chip designs and is promising for carbon-nanotube-based photonics.