PhD thesis - Electron Diffraction using a Cold Atom Source

Rory Speirs PhD thesis.pdf

Much of this thesis will be of interest to only a fairly specific audience, however there are a couple of sections that are written in a pedagogical style, and may be helpful for students AND researches who are getting into the corresponding field.

Crystallography - Section 6.1 gives a pedagogical introduction to crystallography, and the kinematic theory of electron and X-ray diffraction. It is the introduction that I wish I had have been given in first year physics instead of reading Introduction to solid state physics by Charles Kittel.

Partial Coherence - Section 3.2 summarises coherence theory of wavefields, giving a brief, but very intuitive description of the general formalism used in the theory of partially coherent wavefields. It would be a good place to start before going for a dive into the textbooks (which can often be very dense).

Emittance and Brightness in electron and ion beams - Section 3.1 gives an overview of measures of beam quality for classical charged particle beams. It includes a lot of diagrams, and is specifically aimed at removing the confusion and misunderstandings that are common when first entering the field. Again, it is suggested reading before diving into a textbook.

Honours thesis - Photoacoustic Tomography Using a Michelson Interferometer

Rory Speirs Honours thesis.pdf

This is a short and sweet thesis based on the work I did in my Honours year (optional 4th year of undergraduate focused on research). Chapters 1 & 2 give a concise overview of photoacoustic tomography. Again, a worthwhile read if you are new into the field.

Assorted notes on physics problems

Here you will find an assortment of notes and calculations I have written up because I couldn't find them online or in a textbook. My hope is that if you are working on one of these problems, the winds of the internet will blow you here, so that you don't have to repeat the work.

Heterodyne measurement of optical frequency combs

Heterodyne frequency combs.pdf

This is a theoretical derivation of exactly what you measure when you do an optical heterodyne measurement (measure a beat note). It summarises the formalism of representing a real electric field with a complex envelope or amplitude function, derives the optical intensity when combining beams with different frequencies on a beamsplitter, and gives the Fourier transform of the optical intensity.

Spatial modes in two-mode squeezing: demystified

Spatial modes demystified.pdf

This is very specific, but if you are doing quantum imaging using two-mode squeezed beams and find yourself confused by the term "mode", fear not, I am here to help. Read spatial modes demystified, and be mystified no longer.