  Bound states in the continuum (BICs) are an excellent platform enabling
highly efficient light-matter interaction in applications for lasing, nonlinear
generation, and sensing. However, the current focus in implementing BICs has
primarily been on single sharp resonances, limiting the extent of electric
field enhancement for multiple resonances. In this study, we conducted
experimental demonstrations to showcase how metasurfaces can enable the control
of symmetry-broken and Friedrich-Wintgen BICs by leveraging the asymmetry of
split resonant rings. This approach allows for the existence of multiple
free-control BIC resonances and tailored enhancement of controlling
light-matter interactions. We have conducted further experiments to validate
the effectiveness and performance of our approach for identification of the
distinct fingerprint of {\alpha}-lactose with high sensitivity using only one
single metasurface. These findings present a novel and efficient platform for
the development of miniaturized and chip-scale photonics devices with intense
light-matter interaction.
