Quasi-BIC-enhanced integrated sensing dielectric metasurfaces for molecular fingerprint retrieval and chiral detection

) factors in the mid-infrared (MIR) region. Importantly, a switchable superchiral field could be generated under off-axis linear polarization by adjusting the period aspect ratio of the unit cell, achieving a volume-averaged chirality enhancement of 195-fold. Coating the metasurface with chiral thalidomide demonstrated its capability for molecular detection, with a 9-order increase in absorbance and over 160-fold enhancement in VCD signals. This work presents a high-performance platform for function multiplexing in broadband fingerprint retrieval and chiral identification, paving the way for advancements in chemical applications and biomedical diagnostics.