主讲人： Dr Mitchell Guy Kenney (PhD, MSci) 格拉斯哥大学
Dr Mitchell Guy Kenney is currently Postdoctoral Research Associate, Microsystems Technology Group, School of Engineering, University of Glasgow. He obtained the M.Sci. (2011) and Ph.D. (2016) Physics with Nanotechnology, University of Birmingham, UK. He is currently in charge of Project: Superspectral camera focal-plane array (SUPERCAMERA) (EP/J018678/1) and Project: Nanostructured Ultra-Thin Lenses (QuantIC phase 2 project).
He has 11 journal publications in renowned international peer-reviewed journals 4 as equally contributing (1st) author, one in Nature Nanotechnology, two in Advanced Materials，one in ACS Photonics, 977 citations, H-Index of 7 (Google Scholar). Impact factor of 123.6 , Average impact factor per paper is 11.2. Co-Investigator on successful Quantic grant application, worth £245k. Contribution to grant is 20% ownership, equivalent to £49k personal income. Researcher Co-Investigator of unfunded EPSRC grant application (final-stage status).
Invited talk at invite-only Rank Prize Funds symposium on Metasurfaces (Lake District, 2017), ~40 world-leading speakers, including Prof. Sir. John Pendry, Prof. Andrea Alu, Prof. Nader Engheta. Peer-reviewer for ACS Photonics, Royal Society Open Science, Optics Express, Optical Materials Express, Journal of Applied Physics, APL Photonics, Annalen der Physik (Publons accredited). Conferences attended: Oral – Nanop 2017, Rank Prize funds 2017; Poster – Nanop 2017, NanoMeta 2015.
Metasurfaces, the 2D variant of metamaterials, have been at the forefront of optics research in the past decade, due to the simplicity and flexibility of their design, and the impact of novel devices which can be realised. Primarily designed using plasmonic effects – fabricated from patterned metallic nanostructures – metasurfaces suffered from poor performance when carrying out the desired response. This is due to the low interaction of light when transmitted through metallic thin films, where the efficiency is typically limited to ~15% or less. Here, I will talk about my work carried out during the last 5 years at both the University of Birmingham (Prof. Shuang Zhang) and, more recently, at the University of Glasgow (Prof. David Cumming), on developing metasurfaces which exhibit very high performance utilising reflection or transmission operation. As examples, I will talk about the following projects; firstly, visible-IR holograms, which were realised using spatially-oriented gold nanorods atop a groundplane (reflectarrays), were able to reach 80% efficiency (Nature Nano, 2015). Secondly, by utilising silicon herringbone structures and geometric phase, asymmetric transmission of circularly polarised THz light was achieved, with conversion efficiencies exceeding 60% (Adv. Mater, 2016). Thirdly, whilst working towards the “SuperCamera” (triple wavelength) project at UoG, I designed ultra-broadband THz absorbers of one octave bandwidth and an average absorption of 86% using supercells of fractal antennas (ACS Photon, 2017). Finally, my current work lies with the production of large aperture dielectric metalenses (1 mm and 10 mm) operating in the near Infrared, with a range of f-numbers and reaching focussing efficiencies of 60% (in progress). Metasurfaces are now at a standard of interest to commercial prospects and show real promise for being a highly sought after commodity in the future.