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Bound states in the continuum (BICs) are widely studied for their ability toconfine light, produce sharp resonances for sensing applications and serve asavenues for lasing action with topological characteristics. Recent experimentshave demonstrated the existence of exotic modes which occur in off-$\Gamma$\points not accessible by symmetry-protected BICs, Freidrich-Wintgen (FW) BICs.In previous works, FW BICs were formed by either varying the incident angle orthrough geometric manipulation. On the contrary, in this work we demonstratethe formation of FW BICs induced by different linear polarization states ofincident terahertz waves. Furthermore, as predicted by theory, the position ofthe FW BIC region is verified to change as a function of asymmetry. This allowsfor a unique parameter, incident polarization, to induce the FW BIC andmodulate the supercavity resonance with the degree of asymmetry. Thepolarization-selective quasi-BICs observed near the FW BIC have potentialapplications in lasing, spectral filtering and high-performance sensingdevices.

Polarization Selective Modulation of the Supercavity Resonance from Friedrich-Wintgen Bound States in the Continuum