THz emission from ultrafast optical orientation

TL;DR

This paper demonstrates both theoretically and experimentally that ultrafast optical excitation with circularly polarized light induces a rapidly varying magnetization density in semiconductors, generating detectable THz radiation.

Contribution

It provides the first combined theoretical and experimental evidence of THz emission resulting from ultrafast optical orientation in semiconductors.

Findings

Detection of THz emission from optically oriented semiconductors.

Correlation between ultrafast magnetization dynamics and THz field generation.

Validation of theoretical models with experimental data.

Abstract

We show both theoretically and experimentally that the magnetization density accompanying ultrafast excitation of a semiconductor with circular polarized light varies rapidly enough to produce a detectable THz field.