Dr Angela Demetriadou BSc, MSc, PhD, MInstP, FHEA

Dr Angela Demetriadou

School of Physics and Astronomy
Royal Society University Research Fellow

Contact details

Address
School of Physics and Astronomy
University of Birmingham
Edgbaston, Birmingham
B15 2TT
United Kingdom

Dr Angela Demetriadou’s work focuses in the general fields of nanophotonics, nanoplasmonics and metamaterials and she has published numerous research papers in the top scientific journals. She has been frequently invited to speak at international conferences and received several awards for her work. Recently, her interests focus on light-matter interaction between molecules and nanopalsmonic devices. This work has led to a Nature and a Science publication, and received significant attention from both the scientific community and the general public.

Angela is also an enthusiastic teacher with broad expertise on various teaching formats and subjects, for which she has been awarded the Fellowship of Higher Education Academy (FHEA). Finally, she is an active champion of equality and diversity in Physical Sciences, participating in the relevant departmental committees and providing pastoral care to under-represented groups.

In 2018, Angela was awarded the University Research Fellowship from The Royal Society, to form a research group a research group in the fields of Nanophotonics and Nanoplasmonics.

Exceptional students interested for a PhD, and potential post-docs in these research areas are encouraged to contact Dr Demetriadou as early as possible.

Qualifications

  • PhD in Metamaterials, Imperial College London, 2010
  • MSc in Radiation Physics with Medical applications (Medical Physics), University College London, 2006
  • BSc (with First Class Honours) in Physics, University of Bristol, 2005

Biography

Dr Angela Demetriadou qualified for a BSc with First Class Honours in Physics from University of Bristol in 2005. She continued her studies at University College London (UCL) with a MSc on Radiation Physics with Medical applications (Medical Physics), specializing on Radiotherapy planning techniques. Then, she went on to study for a PhD in Metamaterials at Imperial College London with Prof. Sir John B Pendry. Apart from a brief period at Queen Mary, University of London, Angela continued to work at Imperial College London. Her work evolved from microwave to optical metamaterials, and later on to plasmonics and nanophotonics, which are the main focus of her current research interests. Since 2017, she is part of the Metamaterials Research Centre at the University of Birmingham.

Angela was awarded the Early Career Award from the New Journal of Physics (IoP) in January 2015 for which she was ‘recognised as being an extremely talented and enthusiastic young researcher’ and the 1st Prize for the Best Overall Paper at the Metamaterials Congress in 2016.

Angela has undertaken a broad range of teaching and various teaching development activities, which were acknowledged with the award of the Fellowship of Higher Education Academy (FHEA) in 2017. Additionally, she served as the Chair of the Physics Research Associate committee at Imperial College London and at the same time participated as a member at the departmental Juno Transparency and Opportunity Committee. Finally, she is a member of Optical Society America (OSA), American Chemical Society (ACS), AAAS/Science and the Institute of Physics (IoP). In 2017, she joined the Quantum Electronics and Photonics (QEP) group committee of IoP as a Member.

Teaching

Year 4 Nanophotonics, Term 1

Postgraduate supervision

Current students:

  • Alexandra Crai, PhD, Imperial College London
  • Nuttawut Kongsuwan, PhD, Imperial College London
  • Peter Fox, PhD, Imperial College London

Past students:

  • Jae-Yeon (Vincent) Lim, UROP student, 2017
  • Victoria Walpole, MSc final year project, Imperial College London, 2013-2014
  • Miquel Blancafort Jorquera, Erasmus MSc student, Imperial College London, 2013
For current PhD opportunities please email Dr Angela Demetriadou as early as possible.

Research

My research interests are focused on the theory of nano-plasmonics, nano-photonics and metamaterials. My work aims to develop analytical and numerical techniques that link abstract theories with experiments.

Nano-plasmonics

Light has the ability to drive the free electrons in metals, such that the electrons are concentrated at metal-dielectric interfaces. This accumulation of electrons induces strong field enhancements, referred to as plasmons (Fig.1). 

Propagating plasmons or surface plasmon polaritons (SPPs)
Figure 1: Propagating plasmons or surface plasmon polaritons (SPPs)

 For metallic nano-structures, light collectively oscillates the electrons in the nano-structure, creating localized plasmons. By specifically designing the shape and arrangement of metallic nano-structures, one has the ability to manipulate plasmons (see Fig.2) and even concentrate light at small enough volumes that enclose just one molecule.

Localized Plasmons on nano-metallic structures
Figure 2: Localized Plasmons on nano-metallic structures

Angela’s work focuses on designing nano-devices for sensing, nano-photonic and quantum technology applications, utilizing the unique properties of plasmons.

Quantum Nano-Plasmonics

Light-Matter Strong coupling in nanoplasmonics

Photo-excited molecules absorb a photon to excite an electron to a higher energy state, and emit a photon when the electron relaxes to the molecule’s ground state (Fig.3). 

 

A photo-excited molecule in a nanoplasmonic structure
Figure 3: A photo-excited molecule in a nanoplasmonic structure

When such photo-excited molecules are placed in plasmonic devices, then the plasmon causes the electron excitations in molecules, but also emissions from the molecule excite the plasmons. Hence, light (plasmon) and matter (molecule) blend together, forming a hybrid system with unique properties. This behaviour allows us to access and manipulate the quantum state of molecules and has the potential to bring and develop quantum technologies at room temperatures.

Angela’s work focuses on the theoretical study and numerical modelling of these strongly-coupled systems, aiming to understand and utilize their properties for future applications. 

Metamaterials

Metamaterials are artificial media made of many nano-metallic components (i.e. nanoplasmonic structures). When the wavelength of light is much larger than these meta-components, we can design the metamaterial such that we manipulate the wave to behave in very unique and unorthodox ways. During the last few years, significant efforts and breakthroughs have been made on fabricating metamaterials with sub-units of just few nanometers. For optical frequencies, self-assembled methods are able to fabricate very complex and interesting metamaterial designs, such as the gyroidal structure (see Fig. 4).

Gyroid Nano-Plasmonic Metamaterials

The gyroid metamaterial
Figure 4 : The gyroid metamaterial

The Gyroid metamaterial (Fig. 4) is a triply-periodic metallic nanostructure with chiral features as shown in figure 1. It is considered an excellent candidate for achieving chirality in the visible wavelength region. As one can see, the gyroid metamaterial is a combination of several inter-connected helices. Its unique design has led to myriad of interesting phenomena, for both its dielectric (photonic crystal) and metallic (metamaterial) gyroids.

Angela’s work focuses on theoretically modelling and understanding the complex behaviour of the gyroid and other similar metamaterial structures. She has interpreted the electromagnetic and chiral properties of the gyroid metamaterial in terms of a tri-helical model, which led to significant experimental breakthroughs on the ultra-fast non-linear behaviour and tenability of the structure.

Other activities

  • Quantum Electronics and Photonics Group Committee, (Institute of Physics, IoP), Member since Sept. 2017
  • Consultant for Metamaterials Technologies Inc (MTI)

Member of Scientific Communities

  • Optical Society of America – OSA, since August 2012
  • American Chemical Society – ACS, since April 2016
  • AAAS/Science, since September 2016
  • Institute of Physics – IoP, since February 2017

Reviewer for research-related funding proposals

  • Engineering and Physical Sciences Research Council (EPSRC)
  • Belgium- Research-Foundation-Flanders (FWO)
  • National Science Centre (Poland)
  • British Council - Newton Fund

Publications

Recent publications

Article

Readman, C, De Nijs, B, Szabo, I, Demetriadou, A, Greenhalgh, R, Durkan, C, Rosta, E, Scherman, OA & Baumberg, JJ 2019, 'Anomalously large spectral shifts near the quantum tunnelling limit in plasmonic rulers with subatomic resolution', Nano Letters, vol. 19, pp. 2051-2058. https://doi.org/10.1021/acs.nanolett.9b00199

Dolan, J, Dehmel, R, Demetriadou, A, Gu, Y, Wiesner, U, Wilkinson, T, Gunkel, I, Hess, O, Baumberg, JJ, Steiner, U, Saba, M & Wilts, B 2019, 'Metasurfaces atop metamaterials: surface morphology induces linear dichroism in gyroid optical metamaterials', Advanced Materials, vol. 31, no. 2, 1803478. https://doi.org/10.1002/adma.201803478

Kongsuwan, N, Demetriadou, A, Chikkaraddy, R, Baumberg, JJ & Hess, O 2018, 'Fluorescence enhancement and strong-coupling in faceted plasmonic nanocavities', EPJ Applied Metamaterials, vol. 5, 6. https://doi.org/10.1051/epjam/2018004

Kongsuwan, N, Demetriadou, A, Chikkaraddy, R, Benz, F, Turek, VA, Keyser, UF, Baumberg, JJ & Hess, O 2018, 'Suppressed Quenching and Strong-Coupling of Purcell-Enhanced Single-Molecule Emission in Plasmonic Nanocavities', ACS Photonics, vol. 5, no. 1, pp. 186-191. https://doi.org/10.1021/acsphotonics.7b00668

Chikkaraddy, R, Turek, VA, Kongsuwan, N, Benz, F, Carnegie, C, Van De Goor, T, De Nijs, B, Demetriadou, A, Hess, O, Keyser, UF & Baumberg, JJ 2018, 'Mapping Nanoscale Hotspots with Single-Molecule Emitters Assembled into Plasmonic Nanocavities Using DNA Origami', Nano Letters, vol. 18, no. 1, pp. 405-411. https://doi.org/10.1021/acs.nanolett.7b04283

Demetriadou, A, Hamm, JM, Luo, Y, Pendry, JB, Baumberg, JJ & Hess, O 2017, 'Spatiotemporal Dynamics and Control of Strong Coupling in Plasmonic Nanocavities', ACS Photonics, vol. 4, no. 10, pp. 2410-2418. https://doi.org/10.1021/acsphotonics.7b00437

Benz, F, Schmidt, MK, Dreismann, A, Chikkaraddy, R, Zhang, Y, Demetriadou, A, Carnegie, C, Ohadi, H, De Nijs, B, Esteban, R, Aizpurua, J & Baumberg, JJ 2016, 'Single-molecule optomechanics in “picocavities”', Science, vol. 354, no. 6313, pp. 726-729. https://doi.org/10.1126/science.aah5243

Mertens, J, Demetriadou, A, Bowman, RW, Benz, F, Kleemann, M-E, Tserkezis, C, Shi, Y, Yang, HY, Hess, O, Aizpurua, J & Baumberg, JJ 2016, 'Tracking Optical Welding through Groove Modes in Plasmonic Nanocavities', Nano Letters, vol. 16, no. 9, pp. 5605-5611. https://doi.org/10.1021/acs.nanolett.6b02164

Chikkaraddy, R, De Nijs, B, Benz, F, Barrow, SJ, Scherman, OA, Rosta, E, Demetriadou, A, Fox, P, Hess, O & Baumberg, JJ 2016, 'Single-molecule strong coupling at room temperature in plasmonic nanocavities', Nature, vol. 535, no. 7610, pp. 127-130. https://doi.org/10.1038/nature17974

Lombardi, A, Demetriadou, A, Weller, L, Andrae, P, Benz, F, Chikkaraddy, R, Aizpurua, J & Baumberg, JJ 2016, 'Anomalous Spectral Shift of Near- and Far-Field Plasmonic Resonances in Nanogaps', ACS Photonics, vol. 3, no. 3, pp. 471-477. https://doi.org/10.1021/acsphotonics.5b00707

Demetriadou, A 2015, 'The impact of natural modes in plasmonic imaging', Scientific Reports, vol. 5, 18247. https://doi.org/10.1038/srep18247

Ibbotson, LA, Demetriadou, A, Croxall, S, Hess, O & Baumberg, JJ 2015, 'Optical nano-woodpiles: large-area metallic photonic crystals and metamaterials', Scientific Reports, vol. 5, no. 1. https://doi.org/10.1038/srep08313

Demetriadou, A & Kornyshev, AA 2015, 'Principles of nanoparticle imaging using surface plasmons', New Journal of Physics, vol. 17, no. 1, pp. 013041. https://doi.org/10.1088/1367-2630/17/1/013041

Paget, J, Walpole, V, Blancafort Jorquera, M, Edel, JB, Urbakh, M, Kornyshev, AA & Demetriadou, A 2014, 'Optical Properties of Ordered Self-Assembled Nanoparticle Arrays at Interfaces', Journal of Physical Chemistry C, vol. 118, no. 40, pp. 23264-23273. https://doi.org/10.1021/jp5071192

Farah, P, Demetriadou, A, Salvatore, S, Vignolini, S, Stefik, M, Wiesner, U, Hess, O, Steiner, U, Valev, VK & Baumberg, JJ 2014, 'Ultrafast Nonlinear Response of Gold Gyroid Three-Dimensional Metamaterials', Physical Review Applied, vol. 2, no. 4. https://doi.org/10.1103/PhysRevApplied.2.044002

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