# Terahertz dynamic aperture imaging at stand-off distances using a Compressed Sensing protocol

## TL;DR

This paper demonstrates a novel 0.35 THz dynamic aperture imaging system using optical modulation and compressed sensing at a 1-meter stand-off distance, enabling effective imaging of targets in the far field.

## Contribution

First implementation of optical modulation for large-distance THz imaging with a dynamic aperture and compressed sensing, enabling stand-off security and microscopy applications.

## Key findings

- Successful imaging at 1 meter distance
- Dynamic aperture with 2000 controllable elements
- Feasibility for security and microscopy applications

## Abstract

In this text, results of a 0.35 terahertz (THz) dynamic aperture imaging approach are presented. The experiments use an optical modulation approach and a single pixel detector at a stand-off imaging distance of approx 1 meter. The optical modulation creates dynamic apertures of 5cm diameter with approx 2000 individually controllable elements. An optical modulation approach is used here for the first time at a large far-field distance, for the investigation of various test targets in a field-of-view of 8 x 8 cm. The results highlight the versatility of this modulation technique and show that this imaging paradigm is applicable even at large far-field distances. It proves the feasibility of this imaging approach for potential applications like stand-off security imaging or far field THz microscopy.