Multipole analyses of ultrastrong photon-phonon coupling in all-perovskite Mie metasurfaces

초록

In this manuscript, we present a comprehensive theoretical study on the observation of ultrastrong photon-phonon coupling in an all-perovskite Mie metasurface. In a metasurface comprising micro-cubes made of perovskite MAPbI3, we achieved an impressive Rabi splitting as large as 90% of the theoretical maximum. To elucidate the underlying mechanisms responsible for the observed ultrastrong coupling, we employed multipole decomposition analyses, which proved to be highly effective in distinguishing the relevant spectral peaks associated with the Rabi splitting. Our results demonstrate the potential of all-perovskite Mie metasurfaces as a platform for achieving unprecedented levels of light-matter interaction, with broad implications across multiple disciplines, including quantum optics, optoelectronics, and beyond.

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