Near-Field Nanoimaging of Colloidal Transition Metal Dichalcogenide Waveguides

Abstract

Bulk transition metal dichalcogenide (TMDC) nanostructures are regarded as promising material candidates for integrated photonics due to their high refractive index at the near-infrared wavelengths. In this work, colloidal TMDC waveguides with tailorable dimensions are prepared by a scalable synthetic approach. The optical waveguiding properties of colloidal nanowires are studied by the near-field nanoimaging technique. In addition to dependence on thickness and wavelength, the excitonic responses and resultant waveguide modes in TMDC nanowires can be modulated by the environmental temperature. With the high-throughput production and tunable optical properties, colloidal TMDC nanowires highlight the potential for active optical components and integrated photonic devices. Colloidal transition metal dichalcogenide waveguides with tailorable dimensions are prepared by a scalable synthetic approach. Near-field nanoimaging is exploited to study their optical waveguiding properties, which are tunable by incident wavelength, nanowire thickness, and environmental temperature, highlighting the potential for active optical components and integrated photonic devices. image