# Reinventing the Zel'Dovich Wheel

## TL;DR

This paper proposes a new scattering setup to demonstrate superradiant amplification of electromagnetic waves with orbital angular momentum using rotating conductors, advancing the potential for laboratory observation of Zel'Dovich effect.

## Contribution

It introduces an alternative scattering arrangement for superradiant amplification, incorporating recent advances in optics and condensed matter systems.

## Key findings

- Superradiant amplification of electromagnetic waves with orbital angular momentum demonstrated
- New scattering configuration enhances prospects for Zel'Dovich effect experiments
- Discussion of challenges for laboratory realization

## Abstract

After reviewing the pioneering work by Zel'Dovich in which radiation is amplified perpendicular to the axis of a rotating conductor, we consider an alternative scattering arrangement. We demonstrate superradiant amplification of electromagnetic waves with orbital angular momentum, directed axially towards a rotating conductor. Taking into account recent advances in optics and condensed matter systems, our approach presents new possibilities for rotational superradiance experiments. We discuss remaining challenges that must be faced before a laboratory observation of the Zel'Dovich effect can be considered feasible.