Seminars 2014

2014-12-19: PhD defence by Nicky Thilmann
Title: Highly efficient optical parametric oscillators in the mid-IR
Candidate: Nicky Thilmann
Time: 10:00AM, 2014-12-19
Location: Room FB53, AlbaNova Universitscenter, Roslagstullsbacken 21, Stockholm
Opponent: Prof. Klaus Boller, Dept of Science & Technology, University of Twente, Enschede, Netherland
Supervisors: Professor Valdas Pasiskevicius, Fredrik Laurell
Abstract and thesis: online on DiVA  

2014-11-26: PhD defence by Reza Sanatinia
Title: Ensemble and Individual III-V Semiconductor Nanopillars: Optical Properties and Applications
Candidate: Reza Sanatinia
Time: 10:00AM-12:30PM, 2014-11-26
Location: Sal/hall 205, Electrum, KTH-ICT, Kista
Opponent: Prof. Andrea Fiore, Dept. of Applied Physics, Eindhoven University of Technology, The Netherlands
Supervisors: Prof. Anand Srinivasan
Abstract and thesis: available online on DiVA  

2014-10-31: Kista Science Seminar
Title: Monolithic integration of Ge and III-V channel materials on 300mm Si for <10nm node CMOS
Speaker: Dr. Matty Caymax, Imec, Leuven, Belgium
Time: 3PM, 2014-10-31
Location: Darlington seminar room (Material Physics), Electrum B4, Kista
Abstract: Following the ITRS roadmap for CMOS development, the <12 nm nodes are in need of higher carrier mobilities (than what strained Si can offer). This demand could be fulfilled by new channel materials – Ge for pMOS, IIIV for nMOS. The monolithic integration of epitaxial Ge channels on Si has seen significant progress over the last 4-5 years. However, for IIIV materials only recently important progress has been reported. The lattice mismatch and the different polarities are important sources of crystalline defects.

It is anticipated that Ge and IIIV together with Si channels must be co-integrated. The classical approach with thick, graded strain-relaxed buffer layers is therefore not useful. Much more appealing is a “Fin Replacement Process” in which the Si sitting between SiO2 isolation structures is removed, and replaced by selective epitaxial growth of Ge or IIIV in these narrow trenches. Moreover, this allows defects to be confined and trapped at the trench bottom, known as “Aspect Ratio Trapping”. 

For Ge to outperform strained Si pFinFETs, we need strained Ge. By growing Ge on top of a relaxed SiGe buffer inside the trench, not only we have the defect trapping effect but moreover we can create a compressive strained channel which recently resulted in a world-record s-Ge FinFET. 

In the case of IIIV, next to lattice mismatch there is also the problem of anti-phase domain formation when growing IIIV on silicon. We will discuss two approaches to reduce APDs based on trench shape engineering. One of the main issues encountered with integrating IIIV FETs is electrical device leakage overwhelming any gate action. We will also discuss several approaches to solve this issue.

2014-10-31: PhD defence by Himanshu Kataria
Title: High Quality III-V Semiconductors/Si Heterostructures for Photonic Integration and Photovoltaic Applications
Candidate: Himanshu Kataria
Time: Fri 2014-10-31, 10.00am
Location: Sal/Hall A, Electrum 1, KTH – ICT, Kista
Opponent: Dr. Matty Caymax, IMEC, Leuven, Belgium
Supervisors: Prof. Sebastian Lourdudoss
Abstract and thesis: Available online on DiVA

2014-09-26: Kista Science Seminar on Si nanocrystals
Title: Silicon nanocrystals as optoelectronic materials
Speaker: Prof. Minoru Fujii, Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan
Time: Friday 26 September at 15:00 
Location: Darlington seminar room (Material Physics), Electrum B4, Kista
Abstract:
Crystalline silicon is one of the most important materials in modern society. Beyond the applications in LSIs and solar cells, the application field of silicon crystals is recently expanding rapidly, partly because of the high environmental friendliness. When the size of a silicon crystal becomes smaller than 10 nm, i.e., silicon nanocrystals, the quantum size effect starts to play a crucial role and this results in the emergence of several new functions of silicon nanocrystals such as the visible light emission. The energy state structure of silicon nanocrystals can further be modified by doping very small number of impurities. It may be possible that doping of one impurity atom drastically changes the electrical and optical properties of silicon nanocrystals. In my talk, I will first briefly summarize the optical properties of silicon nanocrystals and then discuss how they are modified by impurity-doping. I will then talk about several new functions of intrinsic and doped Si nanocrystals.

2014-09-11: ADOPT seminar on KTH’s career ladder
Title: Future Faculty and Tenure Track
Speaker: Prof. Gustav Amberg, KTH Vice-rektor for Faculty Renewal
Time: Thursday 2014-09-11 at 2PM
Location: KTH AlbaNova
Message: Do not miss this opportunity to get to know how what are the ‘rules of the game’ for academic careers and tenure track (not just at KTH, it applies almost everywhere) and learn about the KTH ‘Future Faculty’ initiative.

2014-05-27: Licentiate defence by Reyhaneh
Title: Micro- and nano-structured metal films for optoelectronic devices
Candidate: Reyhaneh Soltanmoradi
Time: Tuesday 2014-05-27, 2:00-4:00PM
Location: Hall E, Forum, KTH Kista
Opponent: Assoc. Prof. Haiyan Ou, DTU Photonics
Examiner: Assoc. Prof. Sergei Popov
Supervisor: Min Yan, Min Qiu, Qin Wang

2014-05-22: Seminar on micro- and nano-fibres
Title: Optical micro- and nano-fibres
Speaker: Dr. Gilberto Brambilla, Principal Research Fellow at the Optical Research Center of Southampton University 
Time: Thu 2014-05-22 09.00 - 10.00
Location: KTH, AlbaNova, Roslagstullsbacken 21, seminar room FA31 (3rd floor)
More info

2014-05-21: PhD defence by Aziza Sudirman
Title: Increased functionality of optical fibers for life-science applications
Candidate: Aziza Sudirman
Time: 10:00AM-12:30PM
Location: Sal FD5, AlbaNova
Opponent: Dr Gilberto Brambilla, Optoelectronics Research Centre, University of Southampton, Southampton, England
Supervisors: Gunnar Björk, Walter Margulis
AbstractIncreased functionality of optical fibers for life.pdf (pdf 48 kB)

2014-05-09: Docent seminar by Ilya Sytjugov
Title: Physical Principles of Modern Solid State Lighting
Speaker: Ilya Sytjugov,  Department of Materials and Nano Physics
Time: May 9th at 15:00
Location: Conference room Darlington (Electrum, entrance B4)
Category: Docent lecture
Abstract:
In this lecture basic physical mechanisms behind contemporary semiconductor devices used in illumination will be described. The talk is focused on light emitting diodes, which constitute a backbone of the modern energy efficient lighting, but a brief history of lighting will also be covered. Device structure, its material composition and current research trends in this field will be discussed.

2014-05-07: PhotonicSweden seminar
Title: Why Photonics is important for Sweden!
Time: Wednesday May 07, 09:30 - 13:30
Location: KTH Campus, Lindstedtsvägen 5, Room D2
More info

2014-04-25: Kista Science Seminar by Anatoly Zayats
Title: Plasmonics for nanophotonics 
Speaker: Prof. Anatoly V Zayats, Nano-optics and Near-field Spectroscopy Laboratory, Department of Physics, King’s College London, Strand, London WC2R 2LS, United Kingdom
Time: Friday April 25 at 14:00 
Location: Darlington Seminar room, B4, Electrum, Kista
Category: Kista Science Seminar
Abstract:
Recent advances in nanofabrication and subwavelength optical characterisation have led to the development of a new field of nanophotonics concerned with routing and conditioning of optical signals in scalable and integratable devices. In this context, surface plasmons, the electromagnetic excitations coupled to collective motion of conduction electrons near a metal surface, are emerging as a new optical information carrier that enables signal manipulation and processing on the subwavelength scale. Both surface plasmon polaritons and localised surface plasmons provide the electromagnetic field confinement and enhancement and ability to engineer dispersion by controlling nanostructure parameters. Plasmonic metamaterials play crucial role in the development of novel paradigms such as negative refractive index engineering, superlensing and optical cloaking.

In this talk we will discuss various realisations of plasmonic components, including plasmonic metamaterials, for enhancing performance of conventional photonic devices as well as for development of integrated nanophotonic circuits with particular emphasis on active functionalities, such all-optical and electro-optical modulation and amplification of plasmonic signals, as well polarisation and dispersion management. These functionalities facilitate possible applications of plasmonics in telecommunication networks, integrated photonics and lab-on-a-chip systems.

2014-04-25: PhD defence by Fei Lou
Title: Design, fabrication and characterization of plasmonic components based on silicon nanowire platform
Candidate: Fei Lou
Time: Friday 2014-04-25 at 10:00am
Place: Sal/hall D, Forum, KTH-ICT, Isafjordsgatan 39, Kista
Opponent: Professor Anatoly Zayats, King's College London, Strand, London
Supervisors: Docent Lech Wosinski, Prof. Lars Thylén, Prof. Sebastian Lourdudoss
Thesis: available on DiVA

2014-04-22: PhD defence by Xi Chen
Title: Photothermal Effect in Plasmonic Nanostructures and its Applications
Candidate: Xi Chen
Time: Tuesday 2014-04-22 at 2:00pm
Place: Sal/hall D, Forum, KTH-ICT, Isafjordsgatan 39, Kista
Opponent: Prof. Sergey I. Bozhevolnyi, University of Southern Denmark, Odense
Supervisors: Min Qiu and Min Yan
Thesis: available on DiVA

2014-04-08: ADOPT career seminar on patents
Title: Patents – and other ways of protecting your ideas
Speaker: Dr. Christian Kothe-Termén, Zacco Sweden AB
Time: Tuesday 2014-04-08, 15:00-17:00
Place: Lecture Hall FB55, AlbaNova
Abstract: Patents and other intellectual property rights (IP-rights) like design protection, copyright, or trademarks have gained a lot of attention during the last years. But how do they work? What is the best way of protecting your ideas? For what inventions can you get a patent? And how does it work? I will give an overview over patents and other IP-rights.  You will learn about the ideas behind it and how you can use it in your daily work. You will also learn which ideas you should protect and which not, and for what kind of ideas or inventions you can get protection. I will also explain who owns an invention, how you apply for a patent, how long time it takes, what it might cost you and what you may earn on it.

2014-03-20: Albanova Colloquium
Subject: Ultrafast high THz-field photo-driven carrier dynamics and transport in nanostructures
Speaker: Prof. Christos Flytzanis, Ecole Normale Superieure, Paris
Time: Thursday 2014-03-20, 15:00-16:00
Place: Oscar Klein lecture hall, AlbaNova
AbstractFlytzanis abstract update_CF_VP.pdf (pdf 290 kB)

2014-02-27: ADOPT seminar
Title: "Graphene plasmonics: Challenges and opportunities"
Speaker: Prof. Javier García de Abajo, ICFO-The Institute of Photonic Sciences, Spain
Time: Thursday 2014-02-27 at 2PM
Place: Seminar room Nerve (former FMI Conference Room), C3, Electrum, KTH Kista
Abstract: "Plasmons provide unique optical response because they can enhance the electric-field intensity of incidence light by many orders of magnitude and they can concentrate photons down to small regions of space compared with the wavelength. These properties allow us to use plasmons for a vast range of applications, including ultrasensitive detection down to the single-molecule limit. The availability of high quality of graphene has added to these properties the ability to tune the plasmon frequency over a wide spectral range through electrostatic doping. This enables applications to electro-optical light switching and optical modulation. We will start with a brief tutorial on plasmons supported by metallic nanostructures, including fundamental aspects of their interaction with fast electrons and a review of potential technological applications. We will further discuss several aspects of the optical response of graphene that directly reflect the unique quantum characteristics of this material. Besides these intrinsic quantum effects, graphene is also a promising candidate for the implementation of quantum optics schemes in a solid state environment, as we will illustrate with a few examples and a discussion of potential applications in the areas of optoelectronics and quantum optics."

2014-02-27: PhD defence by Yiting Chen
Title: Fabrication and Characterization of Plasmonic Nanophotonic Absorbers and Waveguides
Candidate: Yiting Chen
Time: Thursday 2014-02-27 at 10:00am
Place: Sal/hall D, Forum, KTH-ICT, Isafjordsgatan 39, Kista
Opponent: Prof. Javier García de Abajo, The Institute of Photonic Sciences (ICFO), Spain
Supervisors: Min Qiu and Min Yan
Thesis: available on DiVA

2014-02-13: Applied Physics Seminar
Title: Biosensing with photonic crystal slabs
Speaker: Prof. Martina Gerken, Institute of Electrical and Information Engineering, Christian-Albrechts-Universität zu Kiel
Time: Thursday 13th of February at 09:15 (Coffee is served from 09:00)
Place: KTH AlbaNova
Abstract: Photonic crystal slabs are periodic nanostructures (e.g., 400-nm period) in a layer with a high refractive index. Photonic crystal slabs provide in-plane optical modes guided or quasi-guided by the high index layer. Quasi-guided modes couple to far field radiation and appear as resonances in transmission and reflection spectra. Refractive index changes at the surface of a photonic crystal slab change the center wavelengths as well as the quality factors of the modes. Here, three different types of sensors employing these effects will be presented. First, a pressure sensor is discussed that is based on a membrane pressed against a photonic crystal slab. The size of the contact area is related to the pressure on the membrane, which is evaluated remotely in an optical transmission or reflection measurement. Next, photonic crystal slabs are employed as microscopy slides to allow for high-contrast imaging of cells. With proper calibration, this approach even enables three-dimensional imaging of objects with a known refractive index. Finally, label-free biomolecular interaction analyses using photonic crystal slabs as transducers will be discussed. Using a simple optical intensity measurement the binding kinetics of a 2.5 nM solution of the protein streptavidin on a biotin-functionalized photonic crystal surface was observed.

2014-02-12: Career seminar by Dr. Annika Vänje
Title: Addressing gender
Speaker: Dr. Annika Vänje, Ergonomics Department, KTH
Time: 10:00-12:00, 2014-02-12
Location: Lecture Hall 431, Forum, KTH Kista

2014-01-31: PhD defence by Andrius Zukauskas
Title: QPM Devices in KTA and RKTP
Candidate: Andrius Zukauskas
Time and place: Friday 10:00am at Albanova FB52
Opponent: Prof. Moti Katz
Supervisor: Carlota Canalias
Thesis: available on DiVA

2014-01-30: ADOPT seminar
Title: Frequency Conversion Devices based on Ferroelectric materials and III V Compounds
Speaker: Prof. Moti Katz, SOREQ, Israel
Time and place: Thursday January 30th 10:15-11:00 at Albanova, FB51
Abstract:
Frequency conversion of light by Quasi Phase-Matching (QPM) based on periodically poled, nonlinear ferroelectric crystals (LiNbO3, LiTaO3 and KTP), has been widely demonstrated at our labs in the past few years. Recent results of our frequency conversion experiments, and the limitations of the ferro-electric crystals will be presented. III-V Semiconductor materials such as GaAs offer a larger nonlinear coefficient and an extensive transparency range. The quasi phase-matching in such devices is achieved through an orientation-patterned GaAs (Op-GaAs) structure. The crucial steps in the process are the preparation of the orientation-patterned templates, and the MOCVD growth of GaAs- based layers on these templates. The main processing methods, together with the difficulties involved in the production of such devices, suitable for efficient frequency conversion, will be discussed.

2014-01-17: Seminar on optical materials at AlbaNova
Title: Optical materials - waveguides and more
Speaker: Ursula Gibson, Professor in Physics at NTNU in Trondheim
Time: 11:15 AM - 12:00 PM
Location: Seminar room FA31, AlbaNova University Center, Stockholm
Abstract
This talk will contain an introduction to some of the optical materials with which I have worked, including protein crystals, photonic crystals and photovoltaic nanomaterials. This introduction will be followed by a more in-depth discussion of two recently initiated projects with some ideas for future work. Silicon-core fiber waveguides for the near-IR (>1.5 micron) have been made using interface modifiers that reduce stress during the cooldown process and will permit inclusion of active species at the interface between the silicon and the silica cladding. Transition-metal doped ZnS films are being made using dopants such as Cr and Fe. While Cr predominantly acts as a dopant, there are reports that Fe can be used both in this role, and to change the overall bandgap of an alloyed film at higher concentrations.  We recently produced our first thick Cr-doped films, and will be investigating their optical properties in the near future.

Innehållsansvarig:Max Yan
Tillhör: Skolan för teknikvetenskap (SCI)
Senast ändrad: 2014-12-17