Ultrafast spin-lasers

TL;DR

This paper demonstrates that coupling carrier spin and light polarization in semiconductor lasers enables room-temperature modulation frequencies above 200 GHz, surpassing conventional lasers and promising ultrafast optical communication.

Contribution

It introduces a novel spin-laser concept that achieves ultrafast modulation by leveraging spin-polarized carriers, overcoming traditional speed limitations.

Findings

Achieved modulation frequencies above 200 GHz at room temperature.

Ultrafast operation relies on short carrier spin relaxation time and large refractive index anisotropy.

Surpassed the speed of conventional directly modulated lasers.

Abstract

The appeal of lasers can be attributed to both their ubiquitous applications and their role as model systems for elucidating nonequilibrium and cooperative phenomena. Introducing novel concepts in lasers thus has a potential for both applied and fundamental implications. Here we experimentally demonstrate that the coupling between carrier spin and light polarization in common semiconductor lasers can enable room-temperature modulation frequencies above 200 GHz, exceeding by nearly an order of magnitude the best conventional semiconductor lasers. Surprisingly, this ultrafast operation relies on a short carrier spin relaxation time and a large anisotropy of the refractive index, both commonly viewed as detrimental in spintronics and conventional lasers. Our results overcome the key speed limitations of conventional directly modulated lasers and offer a prospect for the next generation of low-energy ultrafast optical communication.