# Seeing without touching: weak-disturbance imaging and characterization of ultra-confined optical near fields

## TL;DR

This paper introduces a new imaging technique to visualize ultra-confined optical fields in nanoscale structures without disturbing them.

## Contribution

The novel weak-disturbance imaging method enables the first visualization of nanoslit modes in coupled nanowire pairs.

## Key findings

- High-spatial-resolution PEEM was used to image the ultra-confined nanoslit mode in a coupled nanowire pair.
- The quasi-three-dimensional field distribution of the nanoslit mode was revealed for the first time.

## Abstract

A recent study employing high-spatial-resolution photoemission electron microscopy (PEEM) achieved, for the first time, weak-disturbance imaging of the ultra-confined nanoslit mode in a coupled nanowire pair (CNP), revealing its quasi-three-dimensional field distribution.