Long lasting plasma density structures utilizing tailored density profiles

TL;DR

This paper demonstrates how tailored plasma density profiles can sustain stable plasma waves through autoresonance, enabling precise control and potential applications in plasma photonics, surpassing classical amplitude limits.

Contribution

It introduces a method using tailored density profiles to achieve stable, controllable plasma waves via autoresonance, offering an alternative to laser frequency chirping.

Findings

Density gradients govern nonlinear autoresonant growth.

Saturation amplitudes can exceed classical predictions.

A four-laser setup can generate confined quasiperiodic plasma lattices.

Abstract

Using fully kinetic Particle In Cell simulations, we investigate the stability and performance of autoresonant plasma beat wave excitation in plasmas with tailored density profiles. We show that a prescribed spatial variation of the background density sustains continuous phase locking between the driving laser beat and the excited plasma mode, thereby enabling precise control of the plasma wave packet shape and group velocity and providing an alternative to frequency chirping of the drive lasers. The density gradient scale is found to govern the nonlinear autoresonant growth, and the attainable saturation amplitude can exceed the classical Rosenbluth Liu prediction and, for appropriate laser intensities, approach the nonrelativistic wave breaking limit. We show that a four laser configuration in a steep parabolic density profile can generate a specially confined two phase quasiperiodic plasma lattice. The generation of such structures may lead to novel applications in plasma photonics.