Metasurface-enabled subwavelength flexible waveguide for THz nearfield microscopy and endoscopy

Join the School of Physics and Astronomy at the University of Birmingham for groundbreaking PhD research that aims to improve non-destructive testing technology! Terahertz (THz) is a rapidly expanding field across a myriad of disciplines such as physics, engineering, chemistry and biology. In the overarching field of sensing and imaging, THz radiation is demonstrating unique properties for medical diagnosis, security applications (chemical fingerprinting and standoff screening) and industrial control processes. Unfortunately, due to its millimetre-scale wavelength, resolving features smaller than 300 μm (e.g., biological cells, defects in semiconductors, etc.) is prohibitive with THz free-space radiation. Such tiny dimensions beyond the diffraction limit can be accessed with near-field techniques.

Metamaterials, which are artificially engineered materials with properties not (commonly) available in nature, have shown the potential for effective control and manipulation of waves. Their two-dimensional equivalents, metasurfaces, have proven key for making conventional optical components more compact. What if we utilise metasurfaces to implement unprecedented extremely small flexible waveguides that can illuminate efficiently samples under test with a spot smaller than 300 μm? This PhD research programme will answer this question.

The PhD student will carry out specifically the following tasks: (i) electromagnetic design, modelling and characterisation of flexible waveguides; and (ii) implementation, calibration and automation of the THz near-field imaging system based on the developed waveguides. Other activities supporting the study will also be carried out when required.

We expect the PhD candidate to develop the expertise required to lead an experimental research project, to train students, to interact with colleagues with different backgrounds (physics and engineering) and from different disciplines (i.e., electromagnetism, microwave engineering, material science, optics). Details of the project will be agreed with the interested candidates to tailor the research on his/her interests.

The School of Physics and Astronomy is an Institute of Physics Juno Champion since 2014 and holder of the Athena SWAN Silver Award. Both initiatives recognise the School’s commitment to promote diversity and equality, and to encourage better practice for all members of the community, whilst also working towards developing an equitable working culture in which all students and staff can achieve their full potential.

We welcome applications from all qualified applicants and encourage applications from traditionally under-represented groups in physics and astronomy including, but not limited to, women and Black, Asian and Minority Ethnic. The research programme will take place in the an interdisciplinary environment of the Metamaterials and Nanophotonics group (https://www.birmingham.ac.uk/research/activity/physics/quantum/metamaterials/index.aspx), which will substantially favour collaboration opportunities within University of Birmingham and afield.

You can apply here: https://sits.bham.ac.uk/lpages/EPS005.htm (physics programme) clearly stating the title of the project and the name of the supervisor (Dr. Miguel Navarro-Cía).

Funding notes:

Applications are sought from highly motivated students graduating with first degree (2:1 or higher) in physics or engineering (and preferably a MSci/MEng degree). Funding is awarded by the School on a competitive basis, depending on the strength of the applicant. The funding will cover tuition fees and provide a stipend for 3.5 years. For details of the funding available and advice on making your application, please contact: m.navarro-cia@bham.ac.uk