Seminars 2013

2013-12-20: PhD defense by Martin Levenius
Thesis: Optical parametric devices in periodically poled LiTaO3
Candidate: Martin Levenius
Time: Fri 2013-12-20 10.00 am
Location: Seminar room FA31, Albanova, Roslagstullsbacken 21, KTH
Opponent: Prof. Giuseppe Leo, Université Paris Diderot, Paris, France
Supervisor: Assoc. Prof. Katia Gallo
Abstract: Optical parametric frequency conversion based on quasi phase matching (QPM) in nonlinear optical crystals is a powerful technique for generating coherent radiation in wavelength ranges spanning from the mid-infrared (mid-IR) to the blue, displaying low thermal load and high efficiency. This thesis shows how QPM in one- or two- dimensional lattices can be employed to engineer novel devices for parametric downconversion in the IR, affording freedom in designing both spectral and angular properties of the parametric output. ( See full thesis on KTH-DiVA )

2013-12-11: PhD seminar "How to attract research funding"
Title: How to attract research funding - the game of matching internal and external resources
Speaker: Prof. Gunnar Landgren
Time: Monday 2013-12-11 15:00
Venue: Lecture Hall FA 32, AlbaNova, Roslagstullsbacken 21
Abstract: In the ideal world, whether non-academic or academic, you would always find economic means for pursuing your dreams. In reality, you will typically have to ask your line-manager or a funding agency for money to finance your dream projects. How do you best go about this, and how do you align your project and existing means to the available funding? Here you learn how.

2013-11-29: Seminar by Prof. Dr. Markus Pollnau
Title: Dielectric Waveguide Amplifiers and Lasers and Their Applications
Speaker: Prof. Dr. Markus Pollnau, Chair, Integrated Optical MicroSystems Group, MESA+ Institute for Nanotechnology, University of Twente
Place: Room FB42, AlbaNova University Center
Time: Fri 29 Nov 2013 11:15 AM
Abstract: Miniaturization, on-chip integration, and mass fabrication of optical instruments are key enabling steps for future real-world applications in communication, sensing, biomedicine, space, etc.  Besides DNA analysis in an optofluidic chip as well as Raman spectroscopy and in vivo optical coherence tomography on a silicon chip, our work has focused on dielectric waveguide amplifiers and lasers.  We achieved a rare-earth-ion-doped waveguide amplifier with 1000 dB/cm net gain, exceeding previous reports by two orders of magnitude and making it comparable to the best results reported in semiconductor optical amplifiers, while allowing high-speed amplification.  Fundamental-mode channel waveguide lasers with slope efficiencies up to 85% were obtained, reaching the absolute theoretical limit of the investigated laser system.  A dual-wavelength, distributed-feedback, dielectric waveguide laser on a silicon chip was realized and applied to intra-laser-cavity (ILC) nano-particle sensing.  On a recently secured ERC Advanced Grant, the laser’s ultra-narrow linewidths and ultra-high quality factors, resulting in intra-cavity powers of hundreds of Watts and light-measurand interaction lengths exceeding the circumference of the earth, will be exploited to perform ILC sensing of nano-sized bio-particles in optofluidic chips, first-ever demonstrations of on-chip ILC trace-gas detection and Raman spectroscopy, as well as ILC rare-earth-ion and energy-transfer spectroscopy approaching the single-ion level.

2013-11-13: ADOPT-related seminar on biophotonics
Title: Biophotonics and Nanobiotechnology: Impact on Health Care
Speaker: Paras N. Prasad (State University of New York at Buffalo)
Time & place: Wednesday 13 November 2013 from 15:15 to 16:15 at Svedbergsalen (FD5)
Abstract: This talk will present our multidisciplinary research in Biophotonics and discuss how this field, together with nanobiotechnology, is impacting healthcare. Biophotonics utilizes light-matter interactions for ultrasensitive bioimaging and biosensing as well as for light guided and activated therapies such as photodynamic therapy and photocleavable drug delivery.
Contact: Prof. H. Ågren

2013-11-05: PhD defence by Niels Meiser
Thesis: Novel Technologies for Mode-Locking of Solid-State Lasers
Candidate: Niels Meiser
Time: Tue 2013-11-05 10am
Location: Seminar room FA32, Albanova, Roslagstullsbacken 21, KTH
Opponent: Prof. Günter Steimeyer, Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin, Germany
Supervisor: Prof. Valdas Pasiskevicius, Prof. Fredrik Laurell
AbstractSee full thesis on KTH-DiVA

2013-10-23: Photonics seminar
Title: Technologies for Optical Interconnection: Challenges, opportunities and the role of III-V and silicon photonics
Speaker: Prof. Michael J. Wale, Director Active Products Research, Ocharo Inc., Caswell, UK.
Time: Wednesday 2013-10-23, 2:00PM
Location: FMI conference room, Electrum, KTH Kista

2013-09-27: Kista Science Seminar
Title: Novel dilute nitride III/V-semiconductor laser system for the monolithic integration to Si-microelectronics
Speaker: Prof. Wolfgang Stoltz, Material Sciences Center and Faculty of Physics, Philipps-University, Marburg, Germany
Time: Friday 2013-09-27 15:00
Location: Seminar room Darlington, B4, Electrum, KTH Kista
Abstract: The novel dilute-nitride material system Ga(NAsP) can  be grown lattice-matched to (001) Si-substrate. The incorporation of N in the Ga(NAsP)-material allows for a significant reduction in the lattice constant, which leads on one side to a dislocation free deposition on Si. On the other side the specific conduction band formation process in these materials is used to realize a direct band gap semiconductor. By applying a variety of physical investigation techniques the high crystalline quality as well as the direct band gap character of the novel Ga(NAsP)-material system have been verified. Ga(NAsP)/(BGa)(AsP)-MQWH were grown on exact oriented (001) Si substrates embedded in thick (BGa)P separate confinement hetero-layers by metalorganic vapour phase epitaxy (MOVPE). The incorporation of B into GaP and Ga(AsP) allows for a precise strain management of the whole III/V laser stack towards the lattice constant of Si. The optoelectronic properties and first lasing characteristics of Ga(NAsP)-MQWH on (001) Si-substrate will be presented and discussed.

These results form the basis for a unique realization of  monolithic integration of III/V-based optoelectronic and Si-microelectronic functionalities in the near future. The challenges of this integration concept will be discussed and possible solutions will be presented.

2013-09-27: PhD defence by Carl Junesand
Thesis
: High-quality InP on Si and concepts for monolithic photonic integration
Candidate: Carl Junesand
Time: Fri 2013-09-27 10.00
Location: Sal/Hall E, Forum, KTH-ICT, Isafjordsgatan 39, Kista
Opponent: Dr. Wolfgang Stolz, Philipps University, Marburg
Supervisor: Prof. Sebastian Lourdudoss
AbstractSee full thesis on KTH-DiVA

2013-09-24: Ph.D. seminar "Surviving science"
Title: Surviving science
Speaker: Gunnar Björk
Time: Tuesday 2013-09-24 4:00pm
Venue: Lecture Hall D, Forum, KTH Kista
Abstract: How do you best develop and optimize your career portfolio?  In this seminar some tips and opinions collected by the European Physical Society president John Dudley will be passed along by Gunnar Björk, helping you to navigate the maze of science in an informed way. The time and place will be Tuesday, Sept. 24 at Lecture hall D in the  Forum building at Kista, Isafjordsgatan 39, 1st floor (= Entréplan in Swedish).

2013-06-19: Docent seminar by Carlota Canalias
Title
: Ferroelectric materials
Speaker: Carlota Canalias, KTH Tillämpad fysik
Time: Wednesday 2013-06-19 10.15am
Venue: Room FA32, AlbaNova

2013-06-17: Docent seminar by Michael Fokine
Title: Measuring temperature with modern techniques
Speaker: Michael Fokine, KTH Tillämpad fysik
Time: Manday 2013-06-17 2.15pm
Venue: Room FA32, AlbaNova

2013-06-11: Research ethics seminar
Prof. Christina Moberg will come to ADOPT and talk about Research Ethics on 11 June, 15:30-17:30 at room FA32 at AlbaNova. We will all be subject to ethical considerations in our professional life. Therefore, for Ph.D. students sponsored by ADOPT (ask your supervisor) the seminar is compulsory and for everyone else the seminar is highly recommended.  Read more (doc 23 kB)

2013-05-30: PhD dissertation by Kai Seger
Title: Compact solid-state lasers in the near infrared and visible spectral range
Candidate: Kai Seger
Time: Wed 2013-05-30, 10:00 am
Location: Room FD5, AlbaNova Universitscenter, Roslagstullsbacken 21, Stockholm
Opponent: Professor Uwe Griebner, Max Born Institute, Berlin, Germany
Main Supervisor: Professor Fredrik Laurell
Abstractfollow here

2013-05-29: Licentiate seminar by Staffan Tjörnhammar 
Title: Thermal properties of volume Bragg gratings and its implications on lasers
Licentiand: Staffan Tjörnhammar
Time: Wed 2013-05-29 , 13:15  (1:15 pm)
Location: Room FA32, AlbaNova Universtitetscenter, Roslagstullsbacken 21, Stockholm
Opponent: Professor Mohamed Bourennane, Quantum Information & Quantum Optics, Stockholm University
Main Supervisor: Professor Fredrik Laurell
Abstractfollow here

2013-04-18: AlbaNova Colloquium, Prof. Yong-Hee Lee
Title: Quest for the smallest possible laser
Speaker: Yong-Hee Lee, KAIST, Daejeon, S. Korea
Time: Thursday April 18 at 3:00PM
Location: Oscar Klein Hall FR 4, Albanova University Center, Roslagstullsbacken 21
Abstract: How small a laser can be practically realized? – it is not a curiosity question any more in view of perceived future requirements of all-optical signal processing in communications, quantum computing. This is the question asked at the forefront of the photonics research. In this talk, the search for the smallest possible laser over the last three decades will be reviewed. The evolution of resonant cavities from the 1-D vertical cavity surface emitting laser to the 2-D photonic crystal laser and back to the 1-D ladder-type nano-beam laser will be discussed with biased historical perspectives. Detailed emphases will be placed on recent 1-D nanobeam lasers.

More infoannouncement (pdf 56 kB)

2013-03-25: Kista Science Seminar
Title: Application of laser technologies for analytical process monitoring in steel industry - Examples of applied research at Swerea KIMAB
Speaker: Jonas Gurell, SWEREA KIMAB, Kista
Time: Monday March 25 at 3:00pm
Venue: Lecture hall C1, Electrum, Kista

2013-03-22: MNF seminar
Title: The new generation of fiber-optic communication - digital radio at optical frequencies
Speaker: Richard Schatz, Photonics and Microwave Engineering, KTH
Time: Friday March 22 at 2:00pm
Venue: Lecture hall C1, Electrum, Kista

2013-03-21: Kista Science Seminar
Title: Why do some colloidal silicon nanocrystals exhibit red photoluminescence while others simply have the blues? An answer to the red vs. blue quandary
Speaker: Jonathan G.C. Veinot, Department of Chemistry/National Institute of Nanotechnology, University of Alberta
Time: Thursday March 21 at 3:00pm
Venue: Lecture hall C2, Electrum, Kista

2013-03-21: PhD defence of Patrik Rugeland
Title: Applications of monolithic fiber interferometers and actively controlled fibrers
Time: Thursday March 21 at 10.15am
Venue: Lecture hall FA32, Albanova, KTH
Opponent: Prof. Miguel Andrés, Departemento de Fisica Aplicada ICMUV, Universidad de Valencia, Spanien
Supervisor: Prof. Fredrik Laurell
Co-supervisor: Prof. Walter Margulis
Abstract:
The objective of this thesis was to develop applications of monolithic fiber devices and actively controlled fibers. A special twin-core fiber known as a ‘Gemini’ fiber was used to construct equal arm-length fiber interferometers, impervious to temperature and mechanical perturbations. A broadband add/drop multiplexer was constructed by inscribing fiber Bragg gratings in the arms of a Gemini Mach-Zehnder interferometer. A broadband interferometric nanosecond switch was constructed from a micro-structured Gemini fiber with incorporated metal electrodes. Additionally, a Michelson fiber interferometer was built from an asymmetric twin-core fiber and used as a high-temperature sensor. While the device could be readily used to measure temperatures below 300 °C, an annealing process was required to extend the range up to 700 °C. The work included development, construction and evaluation of the components along with numerical simulations to estimate their behaviors and to understand the underlying processes. The thesis also explored the use of electrically controlled fibers for filtering in the microwave domain. An ultra-narrow phase-shifted fiber Bragg grating inscribed in a fiber with internal electrodes was used as a scanning filter to measure modulation frequencies applied to an optical carrier. A similar grating was used inside a dual-wavelength fiber laser cavity, to generated tunable microwave beat frequencies. The studied monolithic fiber interferometers and actively controlled fibers provide excellent building blocks in such varied field as in microwave photonics, telecommunications, sensors, and high-speed switching, and will allow for further applications in the future.

2013-03-20: Docent seminar of Min Yan
Title: Plasmonics: physics and applications
Speaker: Min Yan, Optics and Photonics, ICT, KTH
Time: Wednesday, March 20 at 3:00pm
Venue: Lecture Hall C1, Electrum, Kista
Abstract: The recent upsurge in research activities on plasmonics within optics and photonics lies in the fact that noble metallic nanostructures can exhibit leveraged and tailorable electromagnetic responses to light, via the so-called free-electron plasmon oscillations. This seminar will shed light on the physical origin behind such extraordinary light-matter interactions. Several important applications of plasmonics, including light localization beyond  diffraction limit and negative-index media, will be pinpointed. A more concrete example on how plasmonic nanostructures can give rise to artificial colors as a result of their super absorptive nature will be presented, accompanied by real-life samples directly out of Electrum lab.

2013-03-08: MNF seminar
Title: Hydride Vapour Phase Epitaxy: Paradise lost and paradise regained
Speaker: Sebastian Lourdudoss
Time: Friday, March 8 at 2:00pm
Venue: Lecture Hall C2, Electrum, Kista 

2013-02-25: Seminar on thermal conductivity in Si membranes
Title: Thermal conductivity in ultra-thin Si membranes: Phonon dispersion relation and lifetime contributions
Speaker: Prof. Clivia M. Sotomayor Torres, Catalan Institute of Nanotechnology and Dept. of Physics, University Autonomous de Barcelona, Spain
Time: Monday, February 25 at 15:00
Venue: Lecture hall C1, Electrum, Kista
Abstract: The reduction of the thermal conductivity in low dimensional materials has been associated with two principal effects, namely, the modification of the acoustic dispersion relation due to the spatial confinement of the phonon modes and the shortening of the phonon mean free path due to the diffuse scattering of phonons at the boundaries of the membranes. We have studied acoustic phonon confinement experimentally and theoretically: The dispersion relation curves have been measured and phase velocities of the modes determined. A reduction of the phase and group velocities of the fundamental flexural mode by more than 1 order of magnitude compared to bulk values have been observed. We have measured the lifetime of coherent acoustic phonon modes with frequencies up to 500 GHz in these membranes using the ultrafast pump-probe technique of asynchronous optical sampling. The decay time of the first-order dilatational mode was seen to decrease significantly from ∼ 4.7 ns to 5 ps with decreasing membrane thickness from ∼ 194 to 8 nm. We compare the experimental results with theories considering both intrinsic phonon-phonon interactions and extrinsic surface roughness scattering including a wavelength-dependent specularity parameter. Our combined results provide an insight into the limits of nanomechanical resonators and specially thermal transport in nanostructures. The latter will be discussed in the context of these phonon studies.

2013-02-15: MNF seminar by Anand Srinivasan
Title: Nanostructured semiconductors
Speaker: Anand Srinivasan
Venue: Lecture Hall C1, Electrum, Kista
Time: Friday, February 15th, 2:00pm

2013-02-08: MNF seminar on nano-optics
Title: Ultrafast nano-optics and nano-materials (continued)
Speaker: Sergei Popov
Venue: Lecture Hall C1, Electrum, Kista
Time: Friday, February 8th, 2:00pm

2013-02-01: MNF seminar on nanophotonics
Title: Activities on metamaterial light absorber in Optics and Photonics
Speaker: Min Qiu
Venue: Lecture Hall C1, Electrum, Kista
Time: Friday, February 1st, 2:00pm

2013-01-25: MNF seminar on nano-optics
Title: Ultrafast nano-optics and nano-materials
Speaker: Saulius Macinkevicius
Venue: Lecture Hall C1, Electrum, Kista
Time: Friday, Jan 25th, 2:00pm

2013-01-18: MNF seminar on silicon photonics
Title: Activities on silicon photonics in KTH Kista
Speaker: Lech Wosinski
Venue: C1, Electrum, Kista
Time: January 18th, 2:00pm

Innehållsansvarig:Max Yan
Tillhör: Skolan för teknikvetenskap (SCI)
Senast ändrad: 2014-01-15