Work

Spatiotemporal chiroptical behavior of dielectric and plasmonic nanoparticles

Year: 2024

Type: article

Abstract: We theoretically examine the spatiotemporal evolution of near-field optical chirality (OC) in both plasmonic and dielectric nanospheres when excited by ultrashort optical pulses. We demonstrate distinct spatiotemporal variations in the near-field OC arising from the differing natures of plasmonic and dielectric resonators. The electric dipole resonant plasmonic nanosphere generates an instantaneous near-field OC that relies on the interference between incident and scattered (induced) fields. Conversely, a resonant dielectric nanosphere sustains a long-lasting OC even after the incident field vanishes, due to the scattered field from resonant electric and magnetic dipoles. We further demonstrate the control over the near-field OC using vector beams to tune electric and magnetic mode excitations. Our work opens up opportunities for spatiotemporal control of nanostructure-enhanced chiral light-matter interactions.

Source: Optics Letters

DOI: 10.1364/ol.537339

Authors: Ankit Kumar Singh, Jer-Shing Huang

Institutions: Leibniz Institute of Photonic Technology, Ghent University, IMEC, National Yang Ming Chiao Tung University, Friedrich Schiller University Jena

Language: English

Topic: Plasmonic and Surface Plasmon Research

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: Deutsche Forschungsgemeinschaft, Leibniz-Gemeinschaft