Terahertz Emission from Spintronic Stack Nanodecorated with Drop-Cast Core-Shell Plasmonic Nanoparticles
Abstract
Spintronic emitters promise to revolutionise terahertz (THz) sources by converting ultrafast optical pulses into broadband THz radiation without phase-matching constraints. Because the conversion relies on spin-current injection across a nanometre-thin magnetic layer, its efficiency is ordinarily limited by weak optical coupling. Here, we present a demonstration of a drop-casting based approach to introduce ultrafast plasmonic-mediated coupling: a sparse-layer of silica-gold core-shell nanoparticles is deposited directly onto a W/Fe/Pt spintronic trilayer. This sparse (six percent) decoration increases the wafer-averaged THz pulse energy, pointing to a very high local conversion enhancement for this low-coverage spintronic emitter compared with the bare stack. This demonstration points to a viable pathway toward highly efficient spintronic terahertz emitters with potential applications in spectroscopy, imaging, and ultrafast technologies.
Cite
@article{arxiv.2512.02889,
title = {Terahertz Emission from Spintronic Stack Nanodecorated with Drop-Cast Core-Shell Plasmonic Nanoparticles},
author = {Vittorio Cecconi and Akash Dominic Thomas and Ji Tong Wang and Cheng-Han Lin and Anoop Dhoot and Antonio Cutrona and Abhishek Paul and Luke Peters and Luana Olivieri and Elchin Isgandarov and Juan Sebastian Totero Gongora and Alessia Pasquazi and Marco Peccianti},
journal= {arXiv preprint arXiv:2512.02889},
year = {2025}
}