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Strong coupling of excitons to optical cavity modes is of immense importanceto understanding the fundamental physics of quantum electrodynamics at thenanoscale as well as for practical applications in quantum informationtechnologies. There have been several attempts at achieving strong couplingbetween excitons in two dimensional semiconductors such as transition metaldichalcogenides (TMDCs) and photonic quasi-bound states in the continuum(BICs). We identify two gaps in the platforms for achieving strong couplingbetween TMDC excitons and photonic quasi-BICs: firstly, in the studies so far,different cavity architectures have been employed for coupling to differentTMDCs. This would mean that typically, the fabrication process flow for thecavities will need to be modified as one moves from one TMDC to the other,which can limit the technological progress in the field. Secondly, there hasbeen no discussion of the impact of fabrication imperfections in the studies onstrong coupling of these subsystems so far. In this work, we address these twoquestions by optimizing a cavity with the same architecture which can couple tothe four typical TMDCs (MoS$_2$, WS$_2$, MoSe$_2$, WSe$_2$) and perform adetailed investigation on the fabrication tolerance of the associated photonicquasi-BICs and their impact on strong coupling.

A universal and stable metasurface for photonic quasi bound state in continuum coupled with two dimensional semiconductors