Tunable Strong Coupling in Transition Metal Dichalcogenide Nanowires

Subwavelength optical resonators with spatiotemporal control of light are essential to the miniaturization of optical devices. In this work, chemically synthesized transition metal dichalcogenide (TMDC) nanowires are exploited as a new type of dielectric nanoresonators to simultaneously support pronounced excitonic and Mie resonances. Strong light–matter couplings and tunable exciton polaritons in individual nanowires are demonstrated. In addition, the excitonic responses can be reversibly modulated with excellent reproducibility, offering the potential for developing tunable optical nanodevices. Being in the mobile colloidal state with highly tunable optical properties, the TMDC nanoresonators will find promising applications in integrated active optical devices, including all‐optical switches and sensors. Chemically synthesized transition metal dichalcogenide (TMDC) nanowires are exploited as a new type of subwavelength optical nanoresonators to simultaneously support pronounced excitonic and Mie resonances. Strong coupling between excitons and Mie resonances is demonstrated to support Mie‐exciton polaritons. Moreover, the optical coupling can be further tuned by optothermal effects in a reversible and reproducible way.