Metasurfaces have emerged as powerful platforms for controlling electromagnetic waves through field confinement and resonance engineering. This work investigates the interplay between magnetic field-driven quasi-Bound State in the Continuum (quasi-BIC) resonance and lattice mode coupling in a complementary metasurface comprising coupled bar resonators. By introducing opposite tilts in the bar resonators, we observe the emergence of sharp resonance resulting from anti-symmetric current distributions, forming a quasi-BIC mode with strong field confinement. It is observed that the strategic change in periodicity significantly enhances the quality factor of the resonance, reaching maximum when the quasi-BIC mode couples to the fundamental lattice mode. We performed terahertz time domain spectroscopy of the fabricated samples and observed that the results are consistent with simulations, further confirming a strong interaction between the modes. These findings opens up an avenue for designing high-Q low loss metasurfaces with potential applications in sensing, filtering, and terahertz photonic devices.
Adhikary et al. (Tue,) studied this question.
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