Abstract
Surface-plasmon-enhanced circular dichroism (CD) spectroscopy is a powerful analytical technique used for detecting chiral molecules, with great potential in biomedical diagnosis and pathogen detection. This work focuses on understanding the physical mechanisms of CD production and developing high-sensitivity CD detection substrates. Numerical simulation of the finite difference time domain (FDTD) method is utilized to design and study half-roll plasmonic nanostructures. The scattering spectra of the structure and the corresponding CD spectra show two resonance peaks, λ1 = 691 nm and λ2 = 903 nm, where the charge distribution of the upper surface and the lower surface shows a quadrupole distribution and a dipole distribution, and both of them are in antibonding mode. The structure’s sensitivity is demonstrated by varying the structure parameters and surrounding medium environment, which provides valuable insights for designing optical devices.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
The authors acknowledge the financial support of this work from the National Natural Science Foundation of China (NSFC) (12074054, 12274054) and the Fundamental Research Funds for the Central Universities (DUT21LK06).
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Y.F. supervised this work. W.B. did numerical simulation and analyzed the data. W.B. wrote the manuscript. All of the authors revised the paper.
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Bian, W., Ma, F. & Fang, Y. Circular dichroism analysis of half-roll plasmonic chiral nanostructures. Opt Rev 30, 526–530 (2023). https://doi.org/10.1007/s10043-023-00832-w
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DOI: https://doi.org/10.1007/s10043-023-00832-w