Calum Williams

Today there exists a multitude of different optical imaging modalities used in the diagnosis and treatment of cancer. I am interested in applying concepts in nanophotonics to the illumination and detection sides of imaging, to unify different modalities in a single device. This has great potential to change the way we image cancer using light.

Brief CV

Publication Highlights

Nanostructured plasmonic metapixels

Published to Nature Publishing Group

C Williams, G Rughoobur, A J Flewitt, T D Wilkinson, Scientific Reports, 7, 7745, (2017)

The work demonstrates the plasmonic metapixel; which permits high reflection capability whilst providing vivid, polarization switchable, wide colour gamut filtering. Ultrathin nanostructured metal-insulator-metal geometries result in the excitation of hybridized absorption modes across the visible spectrum. These modes include surface plasmons and quasi-guided modes, and by tailoring the absorption modes to exist either side of target wavelengths, we achieve pixels with polarization dependent multicolor reflection on mirror-like surfaces.

Plasmonic metalens for narrowband dual-focus imaging

Published to Wiley

C.Williams, Y.Montelongo, T.D.Wilkinson, Advanced Optical Materials, 5(22), (2017)

Ultrathin nanostructured multi-channel lenses (metalenses) that simultaneously control wavelength and polarisation are demonstrated. Each lens selectively focuses narrowband colour and orthogonal polarisations, at two different focal positions. These lenses exhibit focusing properties far beyond that of conventional components. These metalenses should have significant impact in a wide range of fields—specifically optical disc storage technology.

Single-step fabrication of thin-film linear variable bandpass filters based on metal–insulator–metal geometry

Published to OSA

C Williams, G Rughoobur, A J Flewitt, T D Wilkinson, Applied Optics, 55, 9237–9241, (2016)

Optical transmission filters, specifically linear variable bandpass filters (LVBFs), are crucial elements in a variety of applications including astronomy and hyperspectral imaging. However, the cost of LVBFs is relatively expensive for what are commonly 1D Fabry-Perot etalons. Here, using modified thermal evaporation methodology, inexpensive, but high performance LVBFs based on metal-insulator-metal (MIM)-cavities are demonstrated.

Google Scholar: https://scholar.google.co.uk/citations?user=eiR0O0oAAAAJ&hl=en

 

Best conference attended so far:

OSA Frontiers in Optics (FiO) 2014 – for the shear natural beauty of Arizona, afternoon hot tub sessions in the baking heat and post-conference Grand Canyon trip.