A practical guide to Terahertz imaging using thermal atomic vapour

TL;DR

This tutorial explains the principles, system construction, and potential applications of atom-based terahertz imaging, highlighting its advantages such as non-ionising radiation and high spatial resolution.

Contribution

It provides a comprehensive guide to the practical implementation and modeling of atom-based terahertz imaging systems, filling a gap in accessible technical knowledge.

Findings

Terahertz imaging passes through many materials like plastics and cloth.

Terahertz images have higher spatial resolution than lower-frequency methods.

The system's characteristics include spatial resolution, sensitivity, and bandwidth.

Abstract

This tutorial aims to provide details on the underlying principles and methodologies of atom-based terahertz imaging techniques. Terahertz imaging is a growing field of research which can provide complementary information to techniques using other regions of the electromagnetic spectrum. Unlike infrared, visible and ultraviolet radiation, terahertz passes through many everyday materials, such as plastics, cloth and card. Compared with images formed using lower frequencies, terahertz images have superior spatial resolution due to the shorter wavelength, while compared to x-rays and gamma rays, terahertz radiation is non-ionising and safe to use. The tutorial begins with the basic principles of terahertz to optical conversion in alkali atoms before discussing how to construct a model to predict the fluorescent spectra of the atoms, on which the imaging method depends. We discuss the practical aspects of constructing an imaging system, including the subsystem specifications. We then review the typical characteristics of the imaging system including spatial resolution, sensitivity andbandwidth. We conclude with a brief discussion of some potential applications