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Gapped Silicon Dimer Metasurface for High-Sensitivity Dual-Mode Terahertz Chiral Sensing
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DOI：10.1109/JSTQE.2026.3671593.png)
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Abstract
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Terahertz sensing is emerging as a powerful tool in various domains like analytical chemistry and biomedicine, attracting increasing attention due to its unique properties and growing range of applications. Chirality is a geometric property that refers to an object’s asymmetry and inability to be superimposed with its mirror image. The weak nature of chirality in molecules typically requires long light paths and high concentrations for detection. Metasurfaces can produce highly localized chiral fields, enhancing light-molecule interactions near their surfaces. This study demonstrates a dielectric metasurface based on symmetrically gapped silicon dimers for terahertz chiral sensing, which avoids introducing background chiral signals. The metasurface supports accessible superchiral hotspots in the dimer gap under both circularly and linearly polarized terahertz excitations. The bare metasurface achieves a volume-average terahertz circular dichroism (TCD) <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C<sub>E_av</sub></i> of 190 under circularly polarized light (CPL) and 200 under linearly polarized light (LPL). Notably, when a 5-μm-thick chiral biolayer is applied to the metasurface, a volume-averaged <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C<sub>E_av</sub><sub>_bio</sub></i> of 85 (CPL) and 105 (LPL) is achieved. These findings are significant for advancing TCD spectroscopy in the terahertz range.
Keywords:
Dielectric metasurface
chiral sensing
terahertz circular dichroism (TCD)
terahertz rotational optical dispersion (TORD)
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