摘要
The superchiral field that enables ultrasensitive detection and discrimination of chiral matter beyond that of circularly polarized light by its field structure has emerged as a powerful tool in chiroptical spectroscopy,spin photonics,and analytical chemistry.Specially,the superchiral field at the wavelength beyond 15μm is indispensable for various mid-infrared applications,such as ultrasensitive chiroptical sensing in the molecular fingerprint region.Here we propose and present a new strategy to realize the superchiral field with a Kuhn’s dissymmetric factor up to∼90 at the wavelength beyond 15μm.This is enabled by the high-quality(up to∼10^(4))multipole resonance induced by Brillouin-zone-folding-driven quasi-guided mode in a diamond metasurface.This work opens up a new avenue towards realizing mid-infrared superchiral fields at the wavelength beyond 15μm.
基金
supported by the National Key R&D Program of China(Grant No.2024YFE0105200)
the National Nature Science Foundation of China(Grant No.62405284)。
