ArticleiScience2026
Narrow-band asymmetric THz absorbers and polarizers based on impedance-matched, cloaked quasi-BICs in doped Ge microdisk metasurfaces.
Article in iScience, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We present a novel class of narrow-band, polarization-selective terahertz (THz) absorbers and polarizers based on cloaked quasi-bound states in the continuum (qBICs) supported by doped germanium metasurfaces consisting of tilted microdisk and micropillar arrays that break out-of-plane symmetry, enabling impedance-matched conditions at specific Brewster angles. This configuration yields highly asymmetric absorption: near-complete transparency at one incidence angle and strong coupling to cloaked qBICs at the opposite angle. Microdisk arrays in TE polarization exhibit absorbance approaching 100%, while micropillar arrays in TM polarization reach ∼55% under similar conditions. The metasurfaces also work as efficient polarization filters, suppressing one polarization while transmitting the orthogonal one with near 100% efficiency. Additionally, we discuss practical implementation via obliquely grown Ge disks, along with strategies for active tuning of the asymmetry angle. These findings establish cloaked qBIC-based metasurfaces as a versatile platform for high-Q THz absorption, polarization control, and advanced sensing applications.
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