Enhanced Circular Dichroism Induced by Electric and Magnetic Resonance in Nanohole with Embedded Nanorod
Source abstract
Abstract
Circular dichroism (CD) is a significant optical response of chiral plasmonic nanostructures, with extensive applications in chiral sensing, biological detection, and negative refractive index media. In this study, a substantial enhancement of CD signal is achieved by embedding gold nanorod into planar gold L-shaped nanohole arrays. The structural surface charge distribution revealed that electric and magnetic resonance modes are generated under different circularly polarized lights at the same resonance wavelength. The enhanced CD signals originate from stronger magnetic resonance on L-shaped films and embedded nanorod under right circularly polarized light. Moreover, the CD effect of the nanostructure could be controlled by adjusting the relative positioning, aspect ratio of the embedded nanorod, and the period of the array. To further extend the applications of the nanostructure, the relationship between wavelength and refractive index is explored. These results offer novel insights into the design and manipulation of planar chiral materials with substantial CD and also expand the application of chiral structures in refractive index sensors.
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Research context
OpenAlex topics: Plasmonic and Surface Plasmon Research · Metamaterials and Metasurfaces Applications · Gold and Silver Nanoparticles Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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