# Structured 3D linear space–time light bullets by nonlocal nanophotonics

## TL;DR

This paper introduces a new method to create 3D light bullets in free space using a single nonlocal optical surface, eliminating the need for complex equipment.

## Contribution

The novelty lies in using nonlocal nanophotonics to generate space–time coupling without bulky pulse-shaping techniques.

## Key findings

- A single passive nonlocal optical surface can generate 3D linear light bullets.
- The method allows simultaneous control of both external and internal properties of light bullets.
- Spin and orbital angular momentum can be manipulated using this approach.

## Abstract

We propose the generation of 3D linear light bullets propagating in free space using a single passive nonlocal optical surface. The nonlocal nanophotonics can generate space–time coupling without any need for bulky pulse-shaping and spatial modulation techniques. Our approach provides simultaneous control of various properties of the light bullets, including the external properties such as the group velocity and the propagation distance, and internal degrees of freedom such as the spin angular momentum and the orbital angular momentum.