Dr Rair Macedo
- Research Fellow (Electronic & Nanoscale Engineering)
I study condensed matter physics and electromagnetic properties of matter. My current research interests include:
- Magnons, polaritons, and optical properties of magnets;
- Anisotropy in condensed matter as route to hyperbolic media;
- Novel optical effects including: Negative refraction, focusing by flat lenses, Goos-Hanchen shifts and nonreciprocity.
I am also currently working on ordering processes in a new class of frustrated and disordered systems called 'artificial spin ice', these include:
- Macro-ferromagnetism in 'pinwheel' spin ice systems;
- Wall and domain formation.
I am a member of the Material and Condensed Matter Physics Group.
I started pursuing research when I was 16 as a part of my BSc studies in the area of novel optical effects in natural dielectric media. In that work it was shown how quartz crystals could be a natural source for negative refraction, a pioneering research in the area of natural hyperbolic materials for optical applications.
My PhD work at the University of Glasgow was undertaken in order to pursue a similar area, but at an advanced theoretical level, by modelling electromagnetic properties of magnetic structures. During this time I was the first to suggest possibilities for focusing through transmission using simple antiferromagnetic slabs which could be tuned by externally applied fields.
After my PhD, as a research assistant, I worked on models for artificial multifunctional magnets. These structures are nanomagnetic islands artificially structured to display new physical.
I am currently a Research Fellow working with novel optical effects in condensed matter, advanced structured materials, and devices. In particular, I explore novel properties and materials that can control and manipulate electromagnetic waves. For this, I have obtained funding from the Leverhulme Trust (just under £90k) and the Lord Kelvin Adam Smith initiative of The University of Glasgow (£100k).
Macêdo, R. , Dumelow, T. and Stamps, R. L. (2016) Tunable focusing in natural hyperbolic magnetic media. ACS Photonics, 3(9), pp. 1670-1677. (doi:10.1021/acsphotonics.6b00321)
Dumelow, T., Rodrigues da Silva, R., Macêdo, R. , da Costa, J.A.P., Honorato, S.B. and Ayala, A.P. (2011) Negative refraction of far-infrared radiation in quartz. Optics and Photonics News, 22(12), p. 42. (doi:10.1364/OPN.22.12.000042)
Macêdo, R. (2017) Tunable hyperbolic media: magnon-polaritons in canted antiferromagnets. In: Camley, R. E. and Stamps, R. L. (eds.) Solid State Physics. Elsevier, pp. 91-155. ISBN 9780128119914 (doi:10.1016/bs.ssp.2017.10.001)
Macêdo, R. , Stamps, R. L. and Dumelow, T. (2014) Spin canting induced large nonreciprocal Goos-Hänchen shifts. Optics Express, 22(23), pp. 28467-28478. (doi:10.1364/OE.22.028467)
Macêdo, R. and Dumelow, T. (2014) Tunable all-angle negative refraction using antiferromagnets. Physical Review B, 89(3), 035135. (doi:10.1103/PhysRevB.89.035135)