Zahid Hussain passes his viva!

Zahid Hussain

Congratulations to PGR Zahid Hussain, who has passed his viva. His thesis was titled ‘Metal-organic Framework (MOFs) Derived Nanocomposites: Synthesis and Applications in Photocatalysis’. During his time with the CDT, Zahid published 11 papers, plus an English-to-Urdu translation of Seven Brief Lessons on Physics by Carlo Rovelli. Zahid now works as a postdoctoral researcher at Technical University of Munich (TUM).

Zahid reflects on his experience of undertaking a PhD as part of the CDT:

I believe that life is a journey from nowhere to nowhere. The pleasure of living is in the process itself, and destinations only milestones leading us to the next journey. On this path, we meet all kinds of people. While some settle down on the way, others continue to live nomadic academic lives. As a foreign student, I identify myself with migratory birds, who leave behind many relationships, friendships, cultural and sensory experiences of material and non-material things, seeking better learning and living conditions. In the quest for knowledge and professional opportunities, the continuous struggle to assimilate into a new environment provides us with great learning opportunities, which broaden our mental horizons and deepen the understanding of life indeed.

The last 4 years of my life at the University of Exeter have been full of happenings, professionally and personally. I met some wonderful people, on-campus and off-campus. Many interactions turned into enduring friendships. First of all, I got a great sense of freedom in working with my PhD supervisors Dr Yongde Xia and Prof Yanqiu Zhu, which helped me to grow as an independent researcher. Also, my supportive colleagues and friendly environment of Functional Materials Laboratory (Lab 08) made the overall PhD experience very joyful and productive.

The doctoral training program (CDT) gave me the confidence to think independently and make my own research decisions. During this time, I developed some fruitful collaborations, especially with Dr Asif Tahir (Penryn campus), Prof. Roland Fischer (TU Munich), Prof. Freek Kapteijn (TU Delft, NL) and Prof. Ovidiu Ersen (University of Strasbourg, France). The work I did in these collaborations, greatly contributed to shaping my PhD project.

Along with the PhD, the last 4 years have been the most important time of my life. I married my partner Anna-Maria and became a parent of our lovely daughter Selma as if a sailboat navigating without a compass saw the shore and anchored. Countless moments of joy, peace and contentment, as well as many sleepless nights of childcare, frustrating days, lockdown months of Covid-19 and moving back and forth from Exeter to Munich, all made this time substantial.

We wish Zahid the best of luck with his future.

Zahid has co-authored the following publications:

2021

2020

2019

2018

Selected outreach activities

Zahid has translated a book Seven Brief Lessons on Physics by Carlo Rovelli from English to Urdu. It has recently published by the Mashal Books, LahorePakistan.

Zahid has presented at the following conferences:

  • M. Z. Hussain, Y. Xia; Presentation: Bi-MOF derived nanocomposites_applications in photocatalysis, GWPore: Conference on Porous Materials for Energy, Environment and Healthcare Applications, U.K. February 2021. (2nd best presentation award) 
  • M. Z. Hussain, R. A. Fischer, Y. Zhu, Y. Xia; Poster: Making heterostructures with water: Role of temperature and water steam in MOF derived TiO2/CuOx/Cu/C nanocomposites, Euromof-20193rd International Conference on MOFs and Porous Polymers, Paris, France. October 2019.
  • M. Z. Hussain, Y. Zhu, Y. Xia; Presentation: MOF derived photocatalysts for high efficient solar-light-driven H2 evolution. MCEC 2019, Conference on Materials for Clean Energy, NPL, London, U.K.  April 2019.
  • M. Z. Hussain, R. A. Fischer, Y. Zhu, Y. Xia; Presentation: MOF derived bimetal oxide/carbon composites: Synthesis and photocatalytic applications, 6th International Conference on Multifunctional, Hybrid and Nanomaterials, Sitges, Spain, March 2019.
  • M. Z. Hussain, R. A. Fischer, Y. Zhu, Y. Xia; Poster: MOF derived TiO2/C nanocomposites for photocatalysis, ICS Winter School on Catalysis, Innovative Catalysis and Sustainability Scientific and Socio-Economic Aspects, Turin, Italy. January 2019.
  • M. Z. Hussain, Y. Zhu, Y. Xia; Poster: MOF derivatives for visible-light-driven photocatalytic applications, 41st Annual Meeting of the British Zeolite Association (BZA), Cumbria, Ambleside, U.K. July 2018.
  • M. Z. Hussain, Y. Zhu, Y. Xia; Poster: Black porous ZnO@C nanocomposites derived from MOF-5 for highly efficient photocatalytic application, RAMS-Recent Appointees in Materials Science, University of Exeter, U.K. September 2017.
  • M. Z. Hussain, Y. Zhu, Y. Xia; Poster: MOF-5 derived ZnO/C nanocomposites for adsorption and photodegradation of organic pollutants, NIM Conference on Nanostructured Functional Materials for Sustainable Energy Provision, Munich, Germany. July 2017.

Ned Taylor passes his viva!

Ned Taylor

Congratulations to CDT student Ned Taylor, who has just finished his PhD. His thesis was titled ‘Ab Initio Exploration of Interface Structures and Their Properties’.

Ned published five papers during his time as part of the CDT and presented at national and international conferences. He was also involved with the Metabuddies scheme- an outreach scheme led by our PGRs, who visit local schools to engage their students in physics and engineering.

Ned looks back on the experience of undertaking his PhD:

It is finally over. I have written my thesis, had my viva, completed my corrections and have been awarded my doctorate. Yesterday I had a final trek up to the Uni as a PhD student to pick up a copy of my thesis that I had printed for prosperity. It is weird to think that it is all over now; below are some of thoughts on my time as a postgraduate researcher.

A PhD is a unique experience for everyone. For me, it was a wonderful time and, although sometimes stressful, it was always worth it. I have relished in the opportunity to conduct research and the freedom to choose my path of study. I have learnt more about the materials that surround us than I had ever expected. The work was demanding, but that was never an issue as the topics were always fascinating. It was amazing going to conferences and have people attend talks to listen to the research that I conducted. Writing scientific papers was often rather tedious, but the outcome was definitely worth it and really helped in the process of writing my thesis.

I have learnt a lot throughout my PhD. In addition to the science, the courses offered by the CDT were, overall, very rewarding and useful. I learnt how to present, how to understand and communicate with others in a team, how to manage projects, how to put myself forward and highlight my skills. I feel that these skills will be vital for progressing beyond the PhD.

The community of PhD students in the CDT offered the chance to forge good friendships. Going on this journey with other PhD students helped me to relax and enjoy the experience. I am also extremely grateful for the support and guidance that my supervisors, Steve Hepplestone and Eros Mariani, have given me throughout the past four years.

As became a theme in the Hepplestone research group near the end of my PhD (before multiple lockdowns, that is), I shall summarise this chapter of my life with a haiku:

DFT was fun
Lots of time spent fighting tech
PhD is done

With my PhD complete, I am now transitioning over into the field of computer science. I have just started a postdoctoral research fellow position at University of Exeter, looking at ways of automating transport models for use in reducing the carbon impact of traffic systems.

We wish Ned all the best with his new role.

Below is a list of Ned’s publications, and conferences he has presented at:

Ned has co-authored the following publications:

2020

2019

2017

Ned has presented at the following conferences:

 

Julia De Pineda passes her viva!

Julia De Pineda Gutiérrez with her thesis

Congratulations to Julia De Pineda, who passed her viva this month. Her thesis was entitled ‘Multi-layer metasurfaces for manipulating the propagation of microwaves along surfaces and edges’. Julia published four papers during her time with the CDT.

Below, Julia describes the challenges and rewards of undertaking a PhD and the experience of having a virtual viva:

My years as a PhD student have been an emotional rollercoaster. There have been some very tough times, when I’ve been very close to quitting but there have also been really fun times. And it is the difficult times that make you grow anyway so in the end, I am very happy I decided to stay and finish this project. I also feel very lucky to have been able to work with my supervisors who have always been there to point me in the right direction, even when I thought my research was not getting anywhere. I would also like to highlight the role of the CDT regarding the soft skills training that we received along the way. I feel that sometimes as student we don’t see the importance it has but now that I am starting to look for a job I realise how many transferable skills I have acquired during these four years.

From my time as a PhD student I take some really good friends with me and many great experiences, specially from all the conferences I’ve got to attend and the amazing places I was able to discover in the meantime. However, I am very pleased that this time is over and I am very much looking forward to an exciting new adventure, whatever that is. In any case, I am sure I will take with me everything I have learnt these years, both personally and professionally. I can definitely say that I am a better version of myself than I was four years ago and to me that’s the greatest achievement.

Finally, I would like to say that submitting my thesis in the middle of a global pandemic and therefore having a virtual viva was something I was not ready for and could never have imagined when I started my PhD. But it was alright in the end and an enriching experience after all. So I would like to tell anyone in a similar situation to relax and try to get the most out of the experience. I am sure in the future we will look at it in a different way and realise that it made us learn and grow.

Julia is considering retraining as an air-traffic controller. We wish her the best of luck in her future endeavours.

Below is a list of Julia’s publications and conferences she has presented at:

Julia has co-authored the following publications:

2020

2019

2018

2017

Julia has presented at the following conferences:

  • J.D de Pineda, A.P Hibbins, J.R Sambles; Presentation: “Metasurfaces for high index effective media”, 2019 IEEE Radio and Antenna Days of the Indian Ocean (RADIO), Reunion, Reunion, 23 – 26 Sept 2019
  • J.D de Pineda, A.P Hibbins, J.R Sambles; Presentation: “Exploration of Microwave Edge modes in metasurfaces with Glide symmetry”, 13th International Congress on Advanced Electromagnetic Materials for novel wave phenomena (Metamaterials), Rome, Italy, 16 – 21 Sept 2019
  • J.D de Pineda, G.P. Ward, A.P Hibbins, J.R Sambles; Presentation: “Exploration of Edge Modes formed in periodic hexagonal metasurfaces with glide symmetry”, 12th International Congress on Advanced Electromagnetic Materials for novel wave phenomena (Metamaterials), Espoo, Finland, 27 Aug – 1 Sept 2018
  • J.D de Pineda, A.P Hibbins, R.C Mitchell-Thomas, J.R Sambles; Presentation: “Multilayer Hexagonal Metasurfaces for Antenna Applications”, APS/URSI 2017, San Diego, California, 10-14 July 2017
  • J.D de Pineda, A.P Hibbins, R.C Mitchell-Thomas, J.R Sambles; Poster: “Multilayer Hexagonal Metasurfaces for Antenna Applications”, EUPROMETA school, Bordeaux, France, 4-7 April 2017

Liam Trimby passes his viva!

Congratulations to Liam Trimby, who has passed his viva. He was supervised by Prof. C. David Wright and Dr. Anna Baldycheva.Liam’s thesis was titled ‘Phase-Change Meta-Devices for Tuneable Bandpass Filtering in the Infrared’. The examiners were Prof. Martin Cryan from University of Bristol  and the internal examiner was Dr. Mustafa Aziz.

His achievements include winning the poster prize at CHAMP/WAFT conference in May 2018 for his poster on Multispectral Imaging using Phase-Change Meta-Filters.

Liam has also been heavily involved in outreach, having been a Metabuddies Lead Tutor (a schools outreach scheme run by CDT students) and a tutor for Brilliant Club KS4 (an outreach scheme targeted at disadvantaged Key Stage 4 students), as well as volunteering at WOMAD in 2017 and Pint of Science in 2019

Liam has co-authored the following publications:

2019

2018

2017

Liam has presented at the following conferences:

  • Liam Trimby, Anna Baldycheva, David Wright, Poster: “Chalcogenide Perfect Absorbers for the Detection and Modulation of Infra-Red Radiation” Defence Materials Forum, Exeter, United Kingdom, 17th April 2016.
  • Liam Trimby, David Wright, “Phase-Change Metadevices Incorporating GaLaS”, Knowledge Transfer Network – Indstrial Applications of Metamaterials, London, United Kingdom 29th March 2017.
  • Liam Trimby, Anna Baldycheva, David Wright, Poster: “Multispectral Imaging using Phase-Change Meta-Filters”, SPIE West, San Francisco, California, 27th January –  1st February 2018.
  • Liam Trimby, Anna Baldycheva, David Wright, Poster: “Multispectral Imaging using Phase-Change Meta-Filters”, 2nd International Symposium on Doped Amorphous Chalcogenides and Devices, Lake District, United Kingdom, May 2018
  • Liam Trimby, John Lincolin, Anna Baldycheva, David Wright, “Tunable Band-Pass Filters using Phase-Change Materials” 4th Cranfield Defence and Security Symposia, Swindon, United Kingdom, 13th – 14th November.
  • Liam Trimby, Anna Baldycheva, David Wright, Poster: “Tunable Band-Pass Filters using Phase-change Materials”, European Phase-Change and Ovonic Symposium, Catania, Italy, 8th – 10th September, 2018.
  • Liam Trimby, Anna Baldycheva, David Wright, Poster: “Tunable Band-Pass Filters using Phase-Change Materials”, Smart NanoMaterials, Advances, and Applications, Paris, France, 10th – 13th December 2018.
  • Liam Trimby, David Wright, Presentation: “Tunable Band-Pass Filters using Phase-change Materials”, MRS Spring 2019, Phoenix, Arizona, 22nd – 26th April 2019.
  • Liam Trimby, Yat-Yin Au, and C. David Wright, “Electrical switching behaviour of Ge2Sb2SexTe5-x thin films using in-suti micro-heaters”, EPCOS 2019, Grenoble France, 8th – 10th September 2019.

 

Carlota Ruiz De Galarreta passes her viva!

We are delighted to announce that Carlota Ruiz De Galarreta  has passed her viva. She was supervised by Prof. C. David Wright and Dr. Jacopo Bertolotti. Carlota’s thesis was on “Optical phase-change metasurfaces: novel design concepts to practicable devices”. The examiners were Prof Anatoly Zayats from Kings College London, and the internal was Dr Ana Neves from Exeter’s Department of Engineering.

In 2017, Carlota participated in Girls in STEM summer school, an event to encourage 11-13 year old girls to consider careers in STEM.

Carlota worked as a post-doc as part of Prof. C. David Wright’s research group from June this year and is currently a Visiting Research Fellow at Instituto de Óptica Daza de Valdés.

 

Carlota has co-authored the following publications:

2019

  • Ruiz De Galarreta Fanjul C, Alexeev A, Sinev I, Trofimov P, Bertolotti J, Wright CD. (2019) All-dielectric hybrid silicon/Ge2Sb2Te5 optical metasurfaces for tunable and switchable light control in the near infrared, Nanometa 2019: 7th International Topical Meeting on Nanophotonics and Metamaterials, Seefeld, Austria, 3rd – 6th Jan 2019. [PDF]
  • Cai L, Ruiz De Galarreta Fanjul C, Wright CD, Herapath R, Qiu M, Li Q, Hendry E. (2019) Terahertz Amplitude Modulators using Phase-Change Matematerials, ICMAT 2019 – 10th International Conference of Materials for Advanced Technologies, 23rd – 28th Sep 2019.
  • Ruiz De Galarreta Fanjul C, Wright CD. (2019) Non-Volatile, Reconfigurable, Multilevel Photonic Devices Based on Phase-Change Metasurfaces and Thin Films, 2019 MRS Spring Meeting, Phoenix, Arizona, Usa, 22nd – 26th Apr 2019.
  • Gemo E, Carrillo SGC, Degalarreta CR, Baldycheva A, Hayat H, Youngblood N, Bhaskaran H, Pernice WHP, Wright CD. (2019) Plasmonically-enhanced all-optical integrated phase-change memory, Optics Express, volume 27, pages 24724-24738, article no. 17, DOI:10.1364/OE.27.024724. [PDF]

2018

2017

  • Au Y-Y, Garcia-Cuevas Carrillo S, Ruiz De Galarreta Fanjul C, Wright CD. (2017) Infrared Phase-Change Meta-Devices with In-Situ Switching, E/PCOS 2017, Aachen, 3rd – 5th Sep 2017. [PDF]
  • Ruiz de Galarreta C, Alexeev AM, Bertolotti J, Cryan MJ, Klemm M, Wright CD. (2017) The design of practicable beam steering and beam shaping phase-change metasurfaces working at telecom frequencies, European Phase Change and Ovonic Symposium, EPCOS 2017, Aachen, Germany, 3rd – 5th Sep 2017, https://www.epcos.org/.
  • Alexeev AM, Ruiz De Galarreta C, Garcia-Cuevas Carrillo S, Sinev IS, Samusev AK, Gemo E, Nagareddy VK, Au Y-Y, Wright CD. (2017) Tunable Dielectric Metadevices Enabled by Phase-Change Materials, European Phase Change and Ovonic Symposium, EPCOS 2017, Aachen, Germany, 3rd – 5th Sep 2017, https://www.epcos.org/.

 

Carlota presented at the following conferences and workshops:

2018

  •  May 2018, IEEE symposium on circuits and systems (ISCAS 2018), Florence (Italy)- Presentation: ‘Phase-Change Metasurfaces for Dyamic Beam Steering and Beam Shaping in the Infrared’ (authors: C Ruiz de Galarreta, A. Alexeev, J Bertolotti,C D Wright)

2017

  • November 2017, 2017 MRS fall meeting, Boston (EEUU), Presentation: ‘Phase-Change Plasmonic Metasurfaces for Dynamic and Reconfigurable Beam Steering and Beam Shaping in the Near Infrared ‘, (authors: C Ruiz de Galarreta et al.)
  • October 2017, WAFT Scientific meeting 2017, Oxford (UK), Poster: ‘A Phase-change metamaterial-based dynamic beam steering device’ (authors: C Ruiz de Galarreta, A. Alexeev, J Bertolotti, M Cryan, M Klemm, C D Wright)
  • September 2017, E\PCOS conference 2017, Aachen (Germany), Poster: ‘The design of practicable beam steering and beam shaping phase-change metasurfaces working at telecom frequencies’ (authors: C. Ruiz de Galarreta,  A. Alexeev, J. Bertolotti, M.J. Cryan, M. Klemm, C.D. Wright)
  • April 2017, 2017 MRS Spring meeting, Arizona (EEUU), Presentation: ‘Tunable dielectric metadevices enabled by phase-change materials’ (authors: A Alexeev, C Ruiz de Galarreta, S Garcia-Cuevas Carrillo, I S Sinev, CD Wright, E Gemo, V K Nagareddy, DA Zuev)

2016

  •  October 2016, WAFT Scientific meeting 2016, Oxford (UK), Poster: ‘A Phase-change metamaterial-based dynamic beam steering device’ (authors: C Ruiz de Galarreta, J Bertolotti, M Cryan, M Klemm, C D Wright)
  • September 2016, E\PCOS conference 2016, Cambridge (UK), Presentation: ‘Phase-Change meta photonics’ (authors:  C David Wright, Carlota Ruiz de Galarreta, Liam Trimby, Santiago Garcia-Cuevas, Jacopo Bertolotti, Maciek Klemm, Martin Cryan)

Henry Fernández passes his viva!

Henry Fernandez

Many congratulations to PGR Henry Fernández, who this week passed his viva with minor corrections. Henry’s thesis title was ‘Optical and Electronics Study of Hybrid Light-Matter States’. His supervisors were Bill Barnes and Saverio Russo, with the examiners being Rob Hicken (internal) and Said Rodriguez, from AMOLF in the Netherlands.

During his PhD, Henry also participated in many different events. He joined in the Startup Weekend Exeter in October 2018, where his team Dot_IT was the winner of the competition. He also participated in many outreach events as part of the Exeter University Optics and Photonics Society. He was the president of this society from February 2018 to February 2019. He was also the chair of the IONS Exeter conference, recently held from 9 to 12th July 2019. IONS Exeter was a student-led conference that brought together esteemed keynote and invited speakers, as well as normal contributions from different countries.

Check out our previous post on Henry’s thesis for more information about his achievements. We wish him all the best for the future, as he will move to Finland to work in a postdoctoral position with Prof. Zhipei Sun, at the Department of Electronics and Nanoengineering of the Aalto University.

The abstract of Henry’s thesis is below:

Abstract

Hybrid light-matter states are quantum states that result from an efficient combination of light and matter. This combination is efficient when the two constituents exchange their energy faster than the overall energy dissipation.

For such efficiency, devices have to be designed and structured to maximise the energy exchange. When an efficient energy exchange between light and matter is achieved, new quasiparticles are formed.
One type of these particles are the exciton-polaritons, which result from an efficient energy exchange between excitons and a confined light field.

Over the past 40 years, exciton-polaritons have been extensively studied in conventional semiconductors integrated with devices that confine a light field.
However, only in the last five years, exciton-polaritons have been realised in semiconductors with a thickness at the monolayer limit, which was first observed at low temperatures, and later extended to observations at room temperature. These devices performing at room temperature and at the nanoscale are promising for future technologies, where exciton-polaritons may play an important role, due to their combined light and matter properties that provide them with the strong non-linearities necessary for quantum communications among other applications.

However, one crucial step for the use of exciton-polaritons in real applications is the control over their formation. Recent reports elucidate ways to control the excitation of exciton-polaritons at room temperature, using semiconductor transistors integrated with light confinement devices. This control over the excitation of exciton-polaritons is the main focus of the work presented in this thesis.

Previous reports have focused their research in controlling either the light confinement or the excitonic properties of the semiconductor material in separate ways. In this work, however, both have been carefully controlled, allowing for an extended manipulation of exciton-polariton states. The results presented here set a substantial advance on the manipulation of exciton-polaritons in devices operating at room temperature and using 2-dimensional semiconductor materials in tuneable optical microcavities.

These results may lead to application in future quantum technologies through switchable quantum states.

Santiago García-Cuevas Carrillo passed his viva!

We are delighted to announce that PGR Santiago García-Cuevas Carrillo, supervised by Prof. C. David Wright and Prof. Geoff Nash , passed his viva with minor corrections. Santiago’s thesis was on “Reconfigurable Phase-Change Metasurface Absorbers for Optoelectronic Device Applications”. The examiners were Ann-Katrin Michel from ETH Zurich and Dr. Jacopo Bertolotti from University of Exeter.

During his time within the CDT, Santiago participated in multiple outreach activities, presenting several experiments to the public at the Institute of Physics festival, CREATIONS event and WOMAD Festival 2017.

Santiago’s future plans involve working with Prof. C. David Wright as a postdoc for the project “Functionally scaled computing technology: From novel devices to non-von Neumann architectures and algorithms for a connected intelligent world (Fun-COMP)”. We wish him all the best in his future endeavours.

Below is a summary of the various publications and conferences that Santiago participated in, along with his thesis abstract.

Santiago is co-author of the following publications:

2018

Carrillo SGC, Alexeev AM, Au YY, David Wright C. (2018) Reconfigurable phase-change meta-absorbers with on-demand quality factor control, Optics Express, volume 26, no. 20, pages 25567-25581, DOI:10.1364/OE.26.025567. [PDF]

2017

Alexeev AM, Ruiz De Galarreta C, Garcia-Cuevas Carrillo S, Sinev IS, Samusev AK, Gemo E, Nagareddy VK, Au Y-Y, Wright CD. (2017) Tunable Dielectric Metadevices Enabled by Phase-Change Materials, European Phase Change and Ovonic Symposium, EPCOS 2017, Aachen, Germany, 3rd – 5th Sep 2017, https://www.epcos.org/.

2016

Wright CD, Ruiz de Galarreta C, Trimby L, Garcia-Cuevas Carrillo S, Bertolotti J, Hewak DW, Cryan M, Klemm M, Hosseini P, Bhaskaran H. (2016) Phase-change meta-photonics, European Phase Change and Ovonic Symposium, E\PCOS2016, Trinity College Cambridge, 4th – 6th Sep 2016, https://www.epcos.org/e-pcos-2016-1. [PDF]
Garia-Ceuvas Carrillo S, Hosseini P, Bhaskaran H, Wright CD. (2016) Non-volatile Optoelectronic Phase-Change Meta-Displays, The 7th International Conference on Metamaterials, Photonic Crystals and Plasmonics, Malaga, Spain, 25th – 28th Jul 2016. [PDF]
Santiago García-Cuevas Carrillo, Geoffrey R. Nash, Hayat HH, Martin J. Cryan, Maciej Klemm, Harish Bhaskaran, Wright CD. (2016) The design of practicable phase-change metadevices for near-infrared absorber and modulator applications, Optics Express, volume 24, pages 13563-13573, DOI:10.1364/OE.24.013563. [PDF]

2015

Wright CD, Au YY, Garcia-Cuevas Carillo S, Bhaskaran H, Hosseini P, Rios C, Pernice WHP, Stegmaier M. (2015) Exploiting Mixed-Mode Optical-Electrical Functionality in Chalcogenide Phase-Change Glasses, Glass Reflections, Cambridge, 7th – 9th Sep 2015, http://www.glassreflections.sgt.org/Ab-Index.htm.

Santiago presented at the following conferences

2017

October 2017, EuroDisplay 2017, Berlin (Germany), Poster- “Towards A Phase-Change Metamaterial CMY Subtractive Display” (authors: Santiago Garcia-Cuevas-Carrillo, Liam Trimby, Peiman Hosseini, Harish Bhaskaran, C. David Wright)
September 2017, EPCOS 2017, Aachen (Germany), Poster- “Towards A Phase-Change Metamaterial CMY Subtractive Display” (authors: Santiago Garcia-Cuevas-Carrillo, Liam Trimby, Peiman Hosseini, Harish Bhaskaran, C. David Wright)

2016

25th July, Meta 2016, Malaga (Spain), Poster- “Non-volatile optoelectronic phase-change metadisplays” (authors: Santiago Garcia-Cuevas Carrillo, C. David Wright, Peiman Hosseini, Harish Bhaskaran)

 

Santiago’s thesis abstract

This thesis is concerned with the design and development of dynamically reconfigurable optical metasurfaces. This reconfigurability is achieved by integrating chalcogenide phase-change materials with metal-insulator-metal metasurface absorbers. Switching the phase-change material between its amorphous and crystalline states results in dramatic changes in its optical properties, with consequent dramatic changes in the resonant behaviour of the plasmonic metasurface with which it is integrated. Moreover, such changes are non-volatile, reversible and potentially very fast, in the order of nanoseconds. The developed devices in this thesis have been designed to modulate the amplitude of the reflected light in the visible and the near-infrared part of the electromagnetic spectrum with application in reflective display technology and telecommunications.

Miguel Camacho Aguilar passed his viva!

Congratulations to Miguel Camacho Aguilar, who has passed his viva. His thesis title was “Microwave response of finite periodic metal structures”. The examiners were Prof. Guido Valerio from University Pierre and Marie Curie in Paris and Prof. Matthew Browning from University of Exeter.

Miguel will be starting a postdoctoral role in the group of Prof. Nader Engheta at the University of Pennsylvania on 1st March. His future work in the US will be related to metamaterials and plasmonics. Nader invented the field of metatronics, i.e., metamaterial-based optical nano circuitry, in which properly designed nano structures function as “lumped’ optical circuit elements such as optical capacitors, optical inductors and optical resistors. We wish Miguel the best of luck in his new role and career.

Below is a summary of the various publications and conferences that Miguel participated in, along with his thesis abstract. Other notable achievements include his recent Spanish national award for best Physics undergraduate student (class of 2015) and participating in Nanotech PhD student scheme with IOP Publishing in 2017.

Keep up to date with Miguel’s latest research at https://scholar.google.co.uk/citations?user=62eJgVAAAAAJ&hl=en.

Miguel is author/co-author on the following publications:

Miguel attended the following conferences during his degree:

  • Exeter Microwave Metamaterials Meeting 2015 (Exeter, UK, Poster: Resonant microwave transmission through thin metal layers using 2D arrays)
  • CIMTEC 2016 (Perugia, Italy, Presentation: Resonant Transmission through Thin Metal Layers using Two Dimensional Arrays)
  • International Workshop on Metamaterials by Design (Riva del Garda, Italy, Poster: Efficient Analysis of Extraordinary Transmission Through Metallic Screens Perforated With Finite Periodic Arrays of Slots)
  • IEEE Antenna and Propagation Symposium (San Diego, USA, Presentation: Dispersion of Surface Waves Supported by Truncated Metasurfaces)
  • Metamaterials 2017 (Marseille, France, Presentation: Coupled slot metasurfaces with spoof glide symmetry)
  • European School of Antennas Siena, Italy n/a
  • Exeter Microwave Metamaterials Meeting 2017 (Exeter, UK, Presentation: Efficient analysis of the electromagnetic scattering by non-periodic hole arrays)
  • Iberian Meeting on Computational Electromagnetics (Coimbra, Portugal, Presentation: Wiener-Hopf analysis of the scattering by a two dimensional periodic semi-infinite array of dipoles)
  • IEEE Antenna and Propagation Symposium (Boston, USA, Presentation: Wiener-Hopf analysis of the scattering by a two dimensional periodic semi-infinite array of dipoles)

Miguel’s thesis abstract:

This thesis focuses on the study of the perturbations of the microwave response of large finite arrays introduced by truncations. To do so very efficient analysis methods based on the method of moments are developed and implemented for different types of truncated slot/patch arrays. The physical insight gained from the analysis of the microwave response of truncated arrays will help in the engineering of new types of metasurfaces that take full advantage of the knowledge provided in here on the different mechanisms governing the coupling between surface waves and free space radiation. The first part of the thesis deals with the efficient analysis of the electromagnetic scattering by two-dimensional and one-dimensional periodic arrays of slots, as well as by finite arrays of slots in perfectly conducting surfaces. In a second part of the thesis, the canonical problem of the electromagnetic scattering by a semi-infinite array of dipoles (the complementary problem to that of slots) is analysed using a rigorous derivation using the Wiener-Hopf approach, that allows for the analytical separation of the different contributions to the current distributions on the array. Finally, the effect introduced by the introduction of higher symmetries into the dispersion relation of modulated infinite slot metasurfaces is numerically and experimentally explored. It is shown that these lead to low-dispersive ultra-wideband metasurfaces. A design method is proposed for the design of lower-symmetric metasurfaces with similar characteristics which is validated for the design of mirror-symmetric leaky-wave metasurface antenna.