biostudies-literatureUnknown12(12)Li JChirality (<i>C</i>) is a fundamental symmetry property of objects. Detecting and distinguishing molecular chirality in the infrared spectrum is important in life sciences, biology, and chemistry. In this paper, we demonstrate an achiral metasurface based on a gaped dual-germanium-dimer array for enhanced mid-infrared chiral sensing under both circularly polarized light (CPL) and linearly polarized light (LPL) excitations. With the metasurface, strong electric and magnetic dipole resonances with large field enhancement can be generated, resulting in an accessible superchiral hotspot in the dimer gaps under both excitation modes. The maximum electric and magnetic field enhancements exceed 220 and 100 for the bare metasurface, and exceed 70 and 60 for the metasurface coated with a 50 nm chirNanophotonics (Berlin, Germany)2189-2197https://www.ebi.ac.uk/biostudies/studies/S-EPMC11501344biostudies-literatureDielectric dual-dimer metasurface for enhanced mid-infrared chiral sensing under both excitation modes.PMC11501344Ye LLi JfalseDielectric dual-dimer metasurface for enhanced mid-infrared chiral sensing under both excitation modes.Chirality (<i>C</i>) is a fundamental symmetry property of objects. Detecting and distinguishing molecular chirality in the infrared spectrum is important in life sciences, biology, and chemistry. In this paper, we demonstrate an achiral metasurface based on a gaped dual-germanium-dimer array for enhanced mid-infrared chiral sensing under both circularly polarized light (CPL) and linearly polarized light (LPL) excitations. With the metasurface, strong electric and magnetic dipole resonances with large field enhancement can be generated, resulting in an accessible superchiral hotspot in the dimer gaps under both excitation modes. The maximum electric and magnetic field enhancements exceed 220 and 100 for the bare metasurface, and exceed 70 and 60 for the metasurface coated with a 50 nm chir2023-01-01T00:00:00Z2023 Jun2025-04-04T01:05:59.353Z2025-04-04T01:05:59.353ZS-EPMC115013443963403910.1515/nanoph-2023-0128