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

Grayscale-to-Color: Scalable Fabrication of Custom Multispectral Filter Arrays

Published to ACS

C. Williams, G.S.D. Gordon, T.D. Wilkinson, S.E. Bohndiek, ACS Photonics, (2019)

Multispectral imaging captures spatial and spectral information beyond our vision. To achieve low-costand compact designs, multispectral filter arrays based on thin-film optical filters are manufactured atopimage sensors. Each imaging application requires a different set of spectral bands, however, everyspectral band requires a separate patterning step, including multiple material combinations. Hence, withmore bands, the more challenging and expensive the process becomes. We introduce a single-patterning-step process capable of producing high efficiency multispectral filter arrays with an arbitrarynumber of spectral bands. The versatile framework is cost-effective, scalable, simple to implement andcould be key enabling step towards widespread industrial adoption of multispectral image sensors.

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.

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.

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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.