High-order Mie resonance and transient field enhancement in laser-driven plasma nanoshells

TL;DR

This paper explores high-order Mie resonances in laser-driven plasma nanoshells, demonstrating significant transient electric field enhancement and analyzing the effects of pulse duration on resonance buildup.

Contribution

It combines Mie theory and particle-in-cell simulations to reveal how optimal geometries and pulse durations influence plasma resonance and field enhancement.

Findings

Approximately threefold electric field enhancement at 800 nm

Transient resonance buildup occurs within tens of femtoseconds

Few-cycle pulses reduce resonance due to insufficient buildup

Abstract

We demonstrate substantial field enhancement in plasma nanoshells through high-order Mie resonances using combined Mie theory and particle-in-cell simulations. Optimal shell geometries yield approximately threefold electric field enhancement for 800 nm irradiation, with transient buildup times of tens of femtoseconds before plasma expansion disrupts resonance. Few-cycle pulses produce reduced enhancement due to insufficient resonance establishment. These findings enable optimized laser-plasma interactions for applications including diagnostics of laser-cluster interaction and energetic ion production from engineered core-shell targets, highlighting the critical role of temporal dynamics in nanoplasma resonances.