  In this study, we investigate a novel "dimerized" dielectric metasurface
featuring dual-mode resonances governed by symmetry-protected bound states in
the continuum (BICs). The metasurface design offers advantages such as
insensitivity to incident light polarization and exceptionally high quality
factors exceeding 10$^5$ for low and moderate structural deviations from the
monoatomic array. By introducing mastered perturbations in the metasurface via
the Brillouin zone folding method, without reducing symmetry, we explore the
behavior of symmetry-protected BIC states and their polarization-independent
responses. Through numerical simulations and analysis, we demonstrate the
superiority of Q factors for specific BIC-based resonances, leading to precise
control over interaction behaviors and light engineering in both near and far
fields. Our findings contribute to the understanding of BIC resonance
interactions and offer insights into the design of high-performance sensing
applications and meta-devices with enhanced functionalities.
