Efficient Manipulation of Strong Coupling Towards the Deep Ultraviolet Region

Realizing strong light-matter interactions opens opportunities for wide applications including quantum information processing, enhancing optical processes, and ultrasensitive sensing, especially for explorations of novel photonic devices. Here, we have theoretically demonstrated the practicability of tuning the strong coupling between the propagating surface plasmon and molecular exciton modes towards the deep ultraviolet (DUV) region for the first time. Moreover, the Rabi splitting strength and wavelength of strong coupling as well as corresponding electromagnetic-field characteristics have been systematically manipulated by adjustment of exciton resonance frequency based on the Lorentzian model. These findings not only extend the working wavelength of strong coupling to DUV region, but also provide an attractive avenue to facilitate the rational design of strong-coupling configurations covering the solar spectrum.