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Durham e-Theses
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Structured Illumination for Super-Resolution Terahertz Imaging

GILL-FLEMING, JAMES (2025) Structured Illumination for Super-Resolution Terahertz Imaging. Doctoral thesis, Durham University.

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Abstract

In this thesis, advanced imaging techniques from the field of microscopy are adopted to perform structured illumination super-resolution imaging at the terahertz (THz) frequency band (0.1-10 THz). Through the use of a structured sinusoidal illumination, higher spatial frequency information that is inaccessible via diffraction-limited widefield imaging is encoded into our images. A Fourier-based reconstruction algorithm produces an image with a resolution
better than that allowed by the diffraction-limit.

For this work, a recently demonstrated, novel 0.55 THz imaging system that performs efficient THz-to-optical conversion using a room-temperature vapour of excited caesium atoms is used. Such a system offers kilohertz framerate speeds, enabling the exploration of these advanced imaging techniques that have, until now, been overlooked at the THz band.

This work will explore the concepts, theory and experimental implementations of two super-resolution imaging techniques and demonstrate an image resolution improvement of $\times1.74 \pm 0.03$ when compared to diffraction-limited widefield imaging.

Item Type:Thesis (Doctoral)
Award:Doctor of Philosophy
Keywords:Terahertz;Super-resolution;Structured illumination;THz imaging;Atomic sensing
Faculty and Department:Faculty of Science > Physics, Department of
Thesis Date:2025
Copyright:Copyright of this thesis is held by the author
Deposited On:28 May 2025 14:34

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