Events & Seminars

Semiconductor quantum dot lasers: Why are they so quantum? November 20, 2017, 2:00 pm Frédéric Grillot Frédéric Grillot Professor, Télécom ParisTech, France, Research Professor, University of New-Mexico, USA

Abstract: By the reduction of semiconductor structure dimensionality, from bulk to quantum-well and finally to quantum-dots (QDs), we gain in control over the energetic distribution of carriers and their interaction with light [1]. While in bulk material many electron states, which are distributed in energy and momentum, have to be occupied, only a few states near the bandgap can contribute to the optical gain in lasers. Over the last past years, tremendous efforts have been…

Advances in Energy Efficiency through cloud and ML October 20, 2017, 4:30 pm Urs Hölzle Urs Hölzle Senior Vice President, Technical Infrastructure & Google Fellow

Abstract: Today, the IT industry accounts for about 2 percent of total greenhouse gas emissions, comparable to the footprint of air travel. This footprint includes everything from datacenters and servers to networks and client equipment like laptops and printers. More and more information is being generated every day, and more and more consumers and enterprises are processing this information every day. Will IT emissions eclipse air travel one day soon?
I think the…

2D material-based layer transfer based on remote epitaxy & uniform epitaxial RAM towards large-scale neuromorphic arrays July 14, 2017, 10:00 am Image of Dr. Jeehwan Kim Jeehwan Kim Massachusetts Institute of Technology

Bio: Professor Jeehwan Kim joined the Mechanical Engineering faculty at Massachusetts Institute of
Technology in September 2015 and the Materials Science and Engineering in February 2016 as a
joint appointment. He is a Principal Investigator in Research Laboratory of Electronics at MIT.
Prof. Kim's group focuses on innovation in nanotechnology for electronic/photonic/energy
applications. Before joining MIT, he was a Research Staff Member at IBM T.J.…

Semiconductor Nanowires for Optoelectronic and Energy Applications June 9, 2017, 12:00 pm Professor H. Hoe Tan H. Hoe Tan Head of the Department of Electronic Materials Engineering at the Research School of Physics and Engineering, The Australian National University

Bio: Professor H. Hoe Tan is currently the Head of the Department of Electronic Materials Engineering at the Research School of Physics and Engineering, The Australian National University. He received his B.E. (Hons) in Electrical Engineering from the University of Melbourne in 1992, after which he worked with Osram in Malaysia as a quality assurance engineer. In 1997, he was awarded the PhD degree from the Australian National University for his dissertation on "Ion beam…

High-Resolution Quantitative Cathodoluminescence (CL) for Defect Metrology in Semiconductors April 7, 2017, 8:30 am Image of Samuel Sonderegger Samuel Sonderegger CEO & Co-Founder of Attolight AG

Abstract: High spatial resolution spectroscopic information may be acquired by using an electron beam in a modern scanning electron microscope (SEM), exploiting a phenomenon called cathodoluminescence (CL). CL can be used to perform non-destructive analysis of a broad range of materials comprising insulators, semiconductors and metals. This approach offers several advantages over usual optical spectroscopy techniques. The multimode imaging capabilities of the SEM enable the…

More-than-Moore with Integrated Silicon-Photonics March 30, 2017, 4:00 pm Image of Vladimir Stojanovic Vladimir Stojanovic Associate Professor, Electrical Engineering & Computer Science, UC Berkeley

Abstract: In this talk we'll present the latest results on the integration of silicon-photonic interconnects into a monolithic platform (45nm SOI logic process and bulk CMOS memory periphery process). These include world's first microprocessor communicating to the outside world with monolithically integrated Si-Photonic devices, as well as the first demonstration of photonics in a bulk CMOS process. We’ll also illustrate some critical aspects of this technology that need to…

Nonlinear Optics in AlGaAs: Past, Present and Future Prospects March 13, 2017, 12:00 pm Image of J. Stewart Aitchison J. Stewart Aitchison University of Toronto, Department of Electrical and Computer Engineering

Abstract: The III‐V semiconductor AlGaAs is an ideal nonlinear optical material. It has large second and third order nonlinearities, a low two‐photon absorption coefficient at the half band gap and allows for the easy fabrication of integrated optical devices. In additoon, AlGaAs can be used directly integrate photodiodes, modulators and passive optical elements on the same chip as the nonlinear elements. This talk will highlight the benefits of this nonlinear material…

Nano Research at the University of Duisburg-Essen: An Overview March 1, 2017, 4:00 pm Tobias Teckentrup Tobias Teckentrup Managing Director, Center for Nanointegration Duisburg-Essen (CENIDE)

Abstract: The Center for Nanoinetgration Duisburg-Essen (CENIDE) is a research center that focuses on nanoscience as the main research area of the University of Duisburg-Essen (UDE, Germany). Since 2005, CENIDE links the activities in natural science, engineering and medicine at the UDE that deal with the nano dimension. The experience of more than 65 working groups is divided into five research areas: Dynamic Processes in Solids, Gas-phase Synthesis, Magnetism,…

Compliant III-V On (001) Si Substrates for Direct Laser Growth January 5, 2017, 4:00 pm Image of Dr. Kei May Lau Kei May Lau Fang Professor of Engineering and Chair Professor, Hong Kong University of Science and Technology (HKUST)

Abstract: Integrating high-performance III-V devices on the mature silicon platform has been a long pursuit over the past few decades. Direct epitaxial growth offers an alternative technology to bonding.  Using nano-patterned Si substrates, we created III-V on silicon templates with low defect density and smooth surface morphology for laser growth.  Such antiphase-domain (APD)-free III-V on silicon compliant templates with high crystalline quality (benchmarked by narrow XRD…

Optofluidic Integration of Hollow-Core Waveguides for Chip-based Biomolecule Analysis December 15, 2016, 4:00 pm Image of Dr. Holger Schmidt Holger Schmidt Narinder Singh Kapany Chair of Optoelectronics and Associate Dean for Research for the School of Engineering at UC Santa Cruz

Abstract: Integrated photonic devices have traditionally been designed for data communications using exclusively solid-state materials. However, a vast area of potential applications, in particular in the life sciences, involve interactions of light with liquids and gases. Recently, a number of optofluidic approaches have been considered that are aimed at integrating such non-solid media with chip-scale photonic structures. We have developed a versatile, planar photonic…