# Active Two-dimensional Steering of Radiation from a Nano-Aperture

## TL;DR

This paper demonstrates experimental control over the direction of radiation from a nano-aperture by manipulating guided modes with a spatial light modulator, achieving stable two-dimensional beam steering.

## Contribution

It introduces a method for actively steering radiation from a nano-aperture using superpositions of guided modes controlled by a spatial light modulator.

## Key findings

- Achieved 9.5-degree beam steering in two orthogonal directions.
- Controlled radiation pattern variation via superposition of three guided modes.
- Demonstrated stable and robust beam steering in a nano-aperture system.

## Abstract

We experimentally demonstrate control over the direction of radiation of a beam that passes through a square nano-aperture in a metal film. The ratio of the aperture size and the wavelength is such that only three guided modes, each with different spatial symmetries, can be excited. Using a spatial light modulator, the superposition of the three modes can be altered, thus allowing for a controlled variation of the radiation pattern that emanates from the nano-aperture. Robust and stable steering of 9.5 degree in two orthogonal directions was achieved.