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Related Experiment Video

Updated: May 16, 2025

Harmonic Nanoparticles for Regenerative Research

Harmonic Nanoparticles for Regenerative Research

Published on: May 1, 2014

Photocurrent-induced harmonics in nanostructures.

Ihar Babushkin^1,2,3, Anton Husakou³, Liping Shi^4,5

¹Institute of Quantum Optics, Leibniz University, Welfengarten 1, 30167 Hannover, Germany.

Nanophotonics (Berlin, Germany)

|April 4, 2025

Summary

This summary is machine-generated.

Photocurrent-induced harmonics, driven by electron tunnel ionization and acceleration, occur in metallic nanostructures. Strong local field gradients reveal details about electron states, including initial velocity, without electron recombination.

Keywords:

Brunel harmonics injection current harmonics nanostructures photocurrent harmonics strong fields tunnel ionization

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Area of Science:

Condensed matter physics
Strong-field physics
Nanophotonics

Background:

Harmonic generation is observed in gases and solids via electron tunnel ionization and acceleration.
This process, distinct from three-step harmonic emission, does not require electron recombination with parent ions.

Purpose of the Study:

To demonstrate photocurrent-induced harmonic generation in metallic nanostructures.
To investigate the effect of local field gradients on these harmonics.
To utilize this phenomenon for probing electron states in the continuum.

Main Methods:

Theoretical modeling of electron dynamics in strong laser fields interacting with metallic nanostructures.
Analysis of photocurrent-induced harmonic spectra.
Investigation of the role of local field gradients and electron initial conditions.

Main Results:

Photocurrent-induced harmonic generation is confirmed in metallic nanostructures.
Strong local field gradients significantly influence harmonic spectra.
The observed influence provides insights into the electron's initial velocity and state in the continuum.

Conclusions:

The mechanism of photocurrent-induced harmonics is applicable to metallic nanostructures.
Local field gradients offer a new pathway to control and understand harmonic generation.
This method can probe the initial state of continuum electrons, including their velocity.