Project Description
Coherent diffractive imaging (CDI) is a microscopy technique for producing high-resolution images of a sample without the need for expensive objective lenses. Unlike other methods such as confocal microscopy, CDI images are retrieved computationally using knowledge about how incident light is diffracted by the sample. This makes CDI very powerful, because information about both the real and imaginary parts of the sample refractive index are retrieved and sources of technical noise (such as sample positioning errors and pointing instability of the incident light) can be compensated computationally to give aberration-free, full-field images with diffraction limited resolution and very large fields of view. Common applications include x-ray crystallography and biological imaging in the extreme ultraviolet ‘water window’ regime, where transmissive optics are unavailable.
This project will focus on the development of a visible light CDI microscope for inspecting optical components and waveguides made using the ultrafast laser inscription system at Fraunhofer Centre for Applied Photonics. We aim to develop high resolution, full-field images of structures written directly into substrates for devices used in biophotonics, environmental monitoring, and laser development as a novel method for assessing performance quality, yield, and manufacturability of new component designs. The microscope will be low cost and will provide critical feedback relating to the design of the written structure. The project will explore different imaging modes, including the near- and far-field diffraction regimes, the possibility of correlating performance characteristics at the component design wavelength with intensity and phase information at the microscope illumination wavelength, and scanning CDI techniques as a route towards the inspection of many components simultaneously in a manner analogous to wafer inspection in electronics.
This applications-focused EngD project is centred on developing a lensless microscope for inspecting optical waveguides and components written using ultrafast laser inscription for integrated photonic circuits and on-chip devices. The project will be led by the Fraunhofer Centre for Applied Photonics in Glasgow – the first Fraunhofer centre in the UK – and the Imaging Concepts Group in the Department of Physics at the University of Glasgow.
Such a collaboration plays to the strengths and aspirations of both institutions who share a common desire to contribute to the knowledge-based economy through high-technology innovation.
The applicant will work in a vibrant, collegiate and supportive environment with access to state-of-the-art laboratory infrastructure and scientific expertise.
Please see link to Fraunhofer’s diversity and inclusion policies:
https://www.fraunhofer.de/en/about-fraunhofer/corporate-responsibility/hr-management/diversity-management.html
CDT Essential Criteria
A Masters level degree (MEng, MPhys, MSc) at 2.1 or equivalent (BEng 1st class considered for candidates with sufficient previous research project experience).
Desire to work collegiately, be involved in outreach, undertake taught and professional skills study.
Project Essential Criteria
First- or upper-second degree in physics or electronic engineering.
Strong ability and desire to set up experimental optical systems and put theory into practice.
Ability to work as part of a wider team and demonstrate initiative when tasked with lone working.
Desire to interact with industrial collaborators.
An enthusiasm and mathematical ability to enable a deep understanding of linear algebra and its applications, of Fourier optics and of phase retrieval techniques.
Knowledge of programming languages such as Python, Matlab, Julia, or C++.
Project Desirable Criteria
Experience in working with experimental optical systems.
Knowledge of CPU-based multiprocessing and GPGPU programming.
The CDT
The CDT in Applied Photonics provides a supportive, collaborative environment which values inclusivity and is committed to creating and sustaining a positive and supportive environment for all our applicants, students, and staff. For further information, please see our ED&I statement: https://bit.ly/3gXrcwg.
Forming a supportive cohort is an important part of the programme and our students take part in various professional skills workshops, including Responsible Research and Innovation, and attend outreach training.