2017/01/01 by Weixuan Zhang, Tong Wu, Rongyao Wang +1 · 36 citations
Chemistry · Engineering · Materials Science · Physics and Astronomy · #Circular polarization #Dielectric #Excitation #Metamaterials and Metasurfaces Applications #Molecule #Photothermal therapy #Plasmon #Plasmonic and Surface Plasmon Research #Synthesis and Properties of Aromatic Compounds #physics.optics
paper · pdf · doi:10.1039/c7nr01527e
published in Nanoscale 9(17), 5701-5707 (Royal Society of Chemistry) · 14 pages, 6figures
openalex publication_date 2017/01/01 · openalex created_date 2017/04/28 · arxiv created 2017/12/25 · arxiv updated 2017/12/27 · openalex updated_date 2026/08/05
We report here the chiroptical amplification effect occurring in the hybrid systems consisting of chiral molecules and Si nanostructures. Under resonant excitation of circularly polarized light, the hybrid systems show strong CD induction signals at the optical frequency, which arise from both the electric and magnetic responses of the Si nanostructures. More interestingly, the induced CD signals from Si-based dielectric nanoantennas are always larger than that from Au-based plasmonic counterparts. The related physical origin was disclosed. Furthermore, compared to the Au-based high-loss plasmonic nanoantennas, Si-based low-loss structures would generate negligible photothermal effect, which makes Si nanoantennas an optimized candidate to amplify molecular CD signals with ultralow thermal damage. Our findings may provide a guideline for the design of novel chiral nanosensors, which are applicable in the fields of biomedicine and pharmaceutics.