Artificially Engineered Nonlinear Circular Dichroism with Chiral Nanoscrolling of 2D Materials.
basic_science · Level V
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- Record sourced from PubMed, PMID 40354511.
- Also identified by DOI 10.1021/acs.nanolett.5c01780.
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Abstract
Nonlinear chiroptical response, particularly nonlinear circular dichroism (CD), holds significant potential for advancing nanotechnology, biophotonics, and molecular imaging. While conventional approaches rely on intrinsic chiral materials, we demonstrate a novel strategy to engineer this effect by transforming achiral two-dimensional (2D) transition-metal dichalcogenides (TMDs) into chiral nanostructures. By scrolling monolayer TMDs into geometrically chiral nanoscrolls, we achieve pronounced nonlinear CD (up to 0.8), evidenced by circular-polarization-dependent second-harmonic generation (SHG). Notably, the SHG-CD degree is tailored by controlling the nanoscrolls' scrolling axes, demonstrating, for the first time, programmable chirality-dependent nonlinear responses in TMD nanoscrolls. Furthermore, the confined electromagnetic fields within the scrolled geometry amplify the SHG intensity by up to 100-fold compared to monolayers. This chiral nanoscrolling is anticipated to enable innovative functionalities in the realm of compact nonlinear light sources and modulators, heralding a new era of advanced photonic applications.