The rotational memory effect of a multimode fiber

TL;DR

This paper demonstrates the rotational memory effect in multimode fibers, enabling rotation-based control of output patterns for potential applications in non-invasive imaging and high-resolution scanning.

Contribution

It introduces and experimentally verifies the rotational memory effect in multimode fibers, a novel phenomenon for wavefront control.

Findings

Rotational memory effect observed over full angular range

Enables non-invasive imaging through multimode fibers

Potential for ultrafast high-resolution scanning

Abstract

We demonstrate the rotational memory effect in a multimode fiber. Rotating the incident wavefront around the fiber core axis leads to a rotation of the resulting pattern of the fiber output without significant changes in the resulting speckle pattern. The rotational memory effect can be exploited for non-invasive imaging or ultrafast high-resolution scanning through a multimode fiber. Our experiments demonstrate this effect over a full range of angles in two experimental configurations.