Multiple Quasiparticle Interactions in Molecularly Functionalized h-BN Polaritonic Systems

Spectroscopic measurements focusing on hybrid light–matter interactions have emerged as a powerful tool for exploring nanoscale energy exchange and optical confinement. Uncovering the interaction between vibrational modes of Tb(H3PTC)3 molecules and phonon-polaritons in h-BN flakes, as well as the interaction between the same polaritons with the molecular excitons of Tb(H3PTC)3, this study demonstrates the formation of hybrid modes in this system at room temperature in the infrared range. Combining h-BN crystals and molecular films, the system achieves coupling between excitons and polaritons, confirmed by near-field optical measurements in the infrared and spectral analysis. This research highlights the effective integration of molecular phonons and excitons with confined polaritonic modes, revealing the potential for efficient energy exchange in hybrid systems. The findings contribute to the broader understanding of vibrational–polaritonic interactions and underscore the utility of this straightforward platform for applications in nanospectroscopy, optoelectronics, and light–matter interaction technologies.