Environmental permittivity-asymmetric BIC metasurfaces with electrical reconfigurability
arxiv(2024)
摘要
In the rapidly evolving field of nanophotonics, achieving precise spectral
and temporal light manipulation at the nanoscale remains a critical challenge.
While photonic bound states in the continuum (BICs) have emerged as a powerful
means of controlling light, their common reliance on geometrical symmetry
breaking for obtaining tailored resonances makes them highly susceptible to
fabrication imperfections and fundamentally limits their maximum resonance
quality factor. Here, we introduce the concept of environmental symmetry
breaking by embedding identical resonators into a surrounding medium with
carefully placed regions of contrasting refractive indexes, activating
permittivity-driven quasi-BIC resonances without any alterations of the
underlying resonator geometry and unlocking an additional degree of freedom for
light manipulation through actively tuning the surrounding refractive index
contrast. We demonstrate this concept by integrating polyaniline (PANI), an
electro-optically active polymer, to achieve electrically reconfigurable qBICs.
This integration not only demonstrates rapid switching speeds, and exceptional
durability but also significantly boosts the system's optical response to
environmental perturbations. Our strategy significantly expands the
capabilities of resonant light manipulation through permittivity modulation,
opening avenues for on-chip optical devices, advanced sensing, and beyond.
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