Fano Resonance in Asymmetric Plasmonic Nanostructure: Separation of Sub-10 nm Enantiomers

Tun Cao, Libang Mao, Yimei Qiu, Li Lu, Agnieszka Banas, Krzysztof Banas, Robert E. Simpson, Hsiang Chen Chui

研究成果: Article同行評審

13 引文 斯高帕斯(Scopus)


Separating enantiomers is vital in chemical syntheses, life sciences, and physics. However, the usual chemical processes are inefficient. Recently, plasmonic nanostructures have drawn considerable attention for manipulating nanoparticles; however, only a few approaches are proposed to discriminate between entities that differ in terms of their handedness. This is because the chiral polarizability is much smaller than the electric polarizability, and therefore the non-chiral gradient force dominates over the chiral gradient force. This limit means that the enantioselective sorting of chiral nanoparticles is a formidable challenge. A plasmonic nanostructure consisting of a disc-double split ring resonator exhibiting a dipole–octupole (DO) Fano resonance (FR) is designed and fabricated. It is theoretically demonstrated that such a DO-FR can markedly enhance the chiral gradient force on the paired enantiomers. The coaxial channel of the resonator possessing high chirality density gradients around the DO-FR is derived. This provides an enhanced chiral gradient force that dominates over the non-chiral gradient forces on sub-10 nm chiral nanoparticles. Enantiomeric pairs can thus experience distinct potential wells in terms of signs. This proposed structure may advance the techniques of enantiopurification and enantioseparation, bringing a new perspective to state-of-the-art all-optical enantiopure synthesis.

期刊Advanced Optical Materials
出版狀態Published - 2019 二月 5

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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