2026-10-12T01:17:46Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34021301 2026-09-29T05:03:30Z category_1 category_915 category_14 category_21 category_24 category_272 category_873 category_46 category_734 category_133 portal_63 item_type_6 month_year_09_2026

Enhanced Circular Dichroism in 3D Helical-Shaped Chiral Plasmonic Metamaterials Assembled from Colloidal Nanocrystals Hsiang-Ting Lin (5134994) Christine Huang (743871) Jonah J. Ng (11104742) Christopher B. Murray (1234398) Cherie R. Kagan (1234386) Biophysics Physical Sciences not elsewhere classified Molecular Biology Biotechnology Evolutionary Biology Environmental Sciences not elsewhere classified Chemical Sciences not elsewhere classified Immunology Biological Sciences not elsewhere classified Plant Biology plane folding induced mode hybridization reshape enhanced circular dichroism infrared chiroptical devices electromagnetic simulations reveal colloidal au nanocrystal total arm length designing compact mid amplify cd beyond report 3d helical 3d helical architectures second helical arm 3d helical metamaterials 3d helical scalable nanocrystal plasmonic metamaterials infrared range electromagnetic coupling work demonstrates nearly 70 nanoimprint lithography ligand exchange isolated components form double engineering three chiral geometry based platform atom coupling antenna loading Circular dichroism (CD) in plasmonic metamaterials can be strengthened by engineering three-dimensional (3D) chiral geometry and electromagnetic coupling. We report 3D helical-shaped plasmonic metamaterials assembled from colloidal Au nanocrystal/bulk Au bilayer heterostructures. Arrays of planar spiral patterns defined by nanoimprint lithography are transformed into 3D helical metamaterials through strain-driven, out-of-plane folding induced by ligand exchange and annealing. Compared with multiple-short-arm (4C) references having the same total arm length, single-helical (1H) structures exhibit stronger differential transmittance between left- and right-handed circularly polarized light (Δ<i>T</i>). Adding a second helical arm to form double-helical (2H) structures further increases Δ<i>T</i> to nearly 70% in the mid-infrared range. Electromagnetic simulations reveal that intra-meta-atom coupling, antenna loading, and mode hybridization reshape the resonances and amplify CD beyond the response of isolated components. This work demonstrates that 3D helical architectures can significantly strengthen plasmonic CD responses and provides a scalable nanocrystal-based platform for designing compact mid-infrared chiroptical devices. 2026-09-29T00:00:00Z Text Journal contribution 10.1021/acs.nanolett.6c03346.s001 https://figshare.com/articles/journal_contribution/Enhanced_Circular_Dichroism_in_3D_Helical-Shaped_Chiral_Plasmonic_Metamaterials_Assembled_from_Colloidal_Nanocrystals/34021301 CC BY-NC 4.0