# Material slow and fast light in a zero-dispersion configuration

## TL;DR

This paper demonstrates that slow and fast light phenomena can occur in a zero-dispersion medium by selecting specific phase components, supported by analytical models and an electrical network experiment.

## Contribution

It reveals the possibility of achieving slow and fast light in zero-dispersion conditions through phase component selection, a novel insight in light propagation control.

## Key findings

- Slow and fast light can be obtained in zero-dispersion media.
- Analytical expressions for transmitted signals are derived.
- Experimental validation using an electrical network mimicking the medium.

## Abstract

We study the propagation of light pulses in an absorbing medium when the frequency of their carrier coincides with a zero of the refractive index dispersion. Although slow light and, a fortiori, fast light are not expected in such conditions, we show that both can be obtained by selecting particular phase-components of the transmitted field. Analytical expressions of the resulting signals are obtained by a procedure of periodic continuation of the incident pulse and a proof of principle of the predicted phenomena is performed by means of a very simple electrical network, the transfer function of which mimics that of the medium.