Work

Tailoring femtosecond LSP resonance and lifetime in a nanoresonator via phase retardation

Year: 2024

Type: article

Abstract: The manipulation of femtosecond plasmon resonance and lifetime in a nanoantenna is crucial for the realization of integrated and miniaturized plasmonic circuits. Here, we have used FDTD simulations to study the plasmonic resonance and lifetime variation of the far-end (P A ) and near-end (P B ) hotspots of size-gradient nanoresonators. We found that the near-field spectrum of P A is red-shifted compared to P B due to the phase retardation effect. By capturing the ultrafast dynamics of both hotspots, we confirm that these phenomena are governed by the transient evolution of the plasmonic field in the forced oscillation regime. Furthermore, the lifetimes of plasmonic hotspots scale directly with their near-field intensities. Meanwhile, the lifetime τ A is always larger than that of τ B in the same nanoresonator because of the smaller non-radiative damping of hotspot P A . Our results provide a basis for the miniaturization of plasmonic nanoresonators.

Source: Optics Express

DOI: 10.1364/oe.538574

Authors: Yulu Qin, Hanmin Hu, Haoyang Cheng, Xiaolong Zhou

Language: English

Topic: Plasmonic and Surface Plasmon Research

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: National Natural Science Foundation of China

Awards: G2178943355, G6088271138, G7062341414