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Mauro F. Pereira, PhD

 Mauro  Ferdandes Pereira

Head of Department of Condensed Matter Theory
Institute of Physics, Czech Academy of Sciences

Department of Condensed Matter Theory
Na Slovance 1999/2

Prague  182 21 Prague 8
Czech Republic

tel: +420 266 052 153
E-mail: m.pereira@tera-mir.org

Area of Expertise

Nonlinear and quantum optics, quantum transport, exciton and polariton effects, band structure engineering, many-body effects, semiconductor lasers (including quantum cascade structures), photo and thermophotovoltaic devices, nonequilibrium Greens functions and numerical methods.


Prof. M.F. Pereira obtained his PhD at the Optical Sciences Center, University of Arizona and has given important contributions to Nonequlibrium Greens Functions (NEGF) Many Body Theory of Transport and Optics of Semiconductor Materials and has been named SPIE Fellow in 2011 for his contributions to the Theory of Semiconductor Materials and Optics. He created the TERA-MIR concept unifying THz and Mid Infrared Radiation and is the Chair of COST ACTION MP1204: TERA-MIR Radiation: Materials, Generation, Detection and Applications, Chair of the Series of NATO TERA-MIR Conferences (2009, 2012 and 2015). He was a research associate at CBPF, Uni-Rostock and TU-Berlin, a visiting Lecturer at Bremen, Senior Researcher at Tyndall Institute, Chair of Theory of Semiconductor Materials and Optics at Sheffield Hallam University (2006-2017) and he is now Head of the Department of Condensed Matter Theory at the Institute of Physics of the Academy of Sciences of Czech Republic.

Lecture Title(s)

Introduction to Semiconductor Optics
This lecture starts from a very simple classical oscillator model, and evolves to basic semiconductor band structure and optical transitions for both bulk and quantum well devices. More advanced treatment for semiconductor materials (semiconductor Bloch equations and nonequilibrium Greens Functions) and the basic physics governing light emission in Light Emitting Diodes and Semiconductor Lasers are also discussed. A clear connection between simple models and the more advanced simulation methods currently used are given as well as ample reference to simulation software available in the market are given. Examples from our semiconductor material simulation capabilities and how our codes have been used for recent device development and characterization in Europe are provided.

Terahertz and Mid Infrared (TERA-MIR) Sources Detection and Applications
Terahertz and Mid Infrared (TERA-MIR) Sources, Detection and Applications THz and MIR (TERA-MIR) radiation can be transmitted through nearly any material without causing biological harm. I will give a summary of present and near future environmental and biomedical applications on diagnostics and therapy and show how science fiction has somehow inspired some of the future applications like MIR breath analysis.  A review of the State of the Art on TERA-MIR detection and applications will be given next.  The effort to develop Quantum Cascade Lasers will be summarized. However other alternatives to THz QCLs will also be presented.  A summary of recent achievements of the TERA-MIR network joint research will be given including metamaterials, photonic crystals and new functionalities; Nonlinearities and interaction of radiation with matter including biomaterials; generation, detection and imaging based on nitrides and bismides, THz emission by difference frequency generations, sub-Terahertz Josephson Junctions as THz sources and new solutions for THz photomixers.  Next I summarize research results in which I have been directly involved including: valence band THz polaritons and antipolaritons, lasers without inversion, predictive simulations of quantum cascade lasers and THz generation by frequency multiplication in semiconductor superlattices harmonic generation in superlattices, intersubband laser linewidth, optical nonlinearities in superlattices and dilute semiconductors

21st Century Optical Engineering: Microscopic Designing Design of Semiconductor Lasers
In the beginning of the 20th Century an electrical engineer or applied physicist would go very far by using simple expressions like voltage = resistance × current. However as the century evolved electronics progressed into micro electronics to nano electronics and optoelectronics and now sophisticated simulation methods are required to create new advanced devices. Devices that were part of science fiction like lasers are now on our every day life. In this talk I will start with the basic principle of operation of semiconductor lasers and then describe in simple terms how laser light can be generated in a semiconductor device at nanoscale. I will then compare and contrast conventional interband optics with intersubband optics and the frontier of microscopic design of semiconductor lasers: the quantum cascade laser. These are the most complex structures ever grown in a laboratory and some of them already have commercial applications. The need for advanced quantum statistical mechanics, many particle and nonequilibrium Physics to describe these devices will be explained. Results of our state of the art device simulator will be presented and the difficulties to create new mid infrared and THz devices will be explained. Both technological and mathematical/simulations issues will be addressed and the role of complex scattering mechanisms will be explained. It will be further demonstrated how we can now visually study the nonequilibrium charge distribution in the structure and use it to analyse potential design failures and re-design the lasers based on those studies. I will close the talk by showing how our new prototype commercial simulator bridges the gap between advanced quantum mechanics and user-friendly software developments.

Elementary excitations and new interubband quasiparticles
This lecture starts with an overview of the quasiparticle concept and illustrations. Next the couplimg of light with material excitations is discussed. Excitons and polaritons play a major role in interband optics and since in the last decade semiconductor optics has been steadily evolving towards the less explored field of intersubband transitions, it is of general interest to understand how light couples with an intersubband excitation. A recent theory predicted the possibility of intersubband polaritons for oblique incidence by means of a cavity created by total internal reflection at the air interface. Indeed the microcavity polarity splitting of intersubband transitions has been observed experimentally. Stimulated by the striking good agreement between theory and experiments, a Hamiltonian approach based on a bosonic approximation for the intersubband excitation has been developed to treat the quantum vacuum properties of the interusbband cavity polariton field. However, this lecture demonstrates that the coupling between light and intersubband excitations in semiconductors is fundamentally different from the well understood coupling to interband transitions that leads to excitonic polaritons and a more general intersubband antipolariton concept is introduced. Different applications of the concept are discussed for both quantum wells and cascade laser structures and numerical results are shown for both interband and intersubband cases.

Nonequilibrium Many Body Engineering of Green Photonics Devices
Existing terrestrial photovoltaic modules rarely achieve solar power conversion efficiencies in excess of 15%. The absolute thermodynamic efficiency limit for solar power conversion is 93.6%, but no known practical approach can reach this high figure. There are three broad approaches that can overcome the limitations of present devices: (1) Multiple junctions are stack solar cell devices with different band-gaps, each absorbing a different portion of the solar spectrum. Spire Semiconductor in the USA has recently acheived 42.3%, but there a significant technological problem to relax strain in the devices. (2) The intermediate band (IB) solar cell provides a means to increase the limiting power conversion efficiency to 63%, but if suffers from two contradictory requirements: (a) the IB should exhibit a finite energy width so that it can be partially occupied to facilitate simultaneous excitation from the IB to the conduction band and from the valence band to the IB; (b) the IB should be as narrow as possible to reduce carrier transport through the miniband. Furthermore even those cannot usually absorb far infrared photons. In contrast, intersubband (ISB) - based Thermophotovoltaic (TPV) devices are not limited by the bandgap and can absorb photons very far in the infrared without suffering from the issues (a,b). In this talk I will give a complete overview of current scientific and technological challenges and address new possible solutions for further extracting energy in the far infrafred, namely ISB thermophotovoltaics. The relevance of combining bandstructure and manybody effects will be clear in the numerical examples presented.

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