Mid-Infrared Superchiral Field Induced by Quasi-Guided Mode in Diamond Metasurface

Le résumé fourni par la source

Abstract 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 15 μm 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 15 μm. 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 15 μm.

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