Spin‐Controlled Helical Quantum Sieve Chiral Spectrometer

Abstract

This article reports on a molecular‐spin‐sensitive‐antenna (MSSA) that is based on stacked layers of organically functionalized graphene on a fibrous helical cellulose network for carrying out spatiotemporal identification of chiral enantiomers. The MSSA structures combine three complementary features: (i) chiral separation via a helical quantum sieve for chiral trapping, (ii) chiral recognition by a synthetically implanted spin‐sensitive center in a graphitic lattice; and (iii) chiral selectivity by a chirality‐induced‐spin mechanism that polarizes the local electronic band‐structure in graphene through chiral‐activated Rashba spin–orbit interaction field. Combining the MSSA structures with decision‐making principles based on neuromorphic artificial intelligence shows fast, portable, and wearable spectrometry for the detection and classification of pure and a mixture of chiral molecules, such as butanol (S and R), limonene (S and R), and xylene isomers, with 95–98% accuracy. These results can have a broad impact where the MSSA approach is central as a precautionary risk assessment against potential hazards impacting human health and the environment due to chiral molecules; furthermore, it acts as a dynamic monitoring tool of all parts of the chiral molecule life cycles.

Sandwich-Type Planar Chiral Metamaterials for Tuning Circular Dichroism

“…A variety of mechanisms have been proposed to explain the origin of plasmonic chirality, such as coupled dipole model [25] , and mixed electric-magnetic dipole polarizability analysis [26][27][28] . At the same time, researchers are trying to enhance and tune the chiral response from various aspects, and it is urgent to design and prepare new structures with strong CD signals and tunable spectra [29,30] .…”