Emrah Acar photo Solomon Assefa photo TYMON BARWICZ photoWilliam M. J. Green photo
 Jens Hofrichter photo Jonathan E. (Jon) Proesel photo Jessie C. Rosenberg photo Alexander V. Rylyakov photo
Yurii A. Vlasov photoChi Xiong photo

Research Areas

Additional information

2012 IEDM postdeadline paper


2012 CLEO Plenary talk


2012 IEEE Comm. Mag., Silicon Nanophotonics Beyond 100G


2011 IBM R&D Journal: Technologies for Exascale systems


2010 SEMICON Talk: CMOS Nanophotonics for Exascale


2008 ECOC Tutorial: On-Chip Si Nanophotonics

Group Name

Silicon Integrated Nanophotonics


Yurii A. Vlasov

Yurii A. Vlasov

Dr. Yurii Vlasov is a Manager of a Silicon Nanophotonics Project. For the last 12 years at IBM he was focused on the development of silicon nanophotonics technology, starting from exploratory fundamental research to advanced engineering development. Dr. Vlasov is currently leading the effort on transitioning the IBM silicon nanophotonics technology to commercial manufacturing for products relevant to IBM Server Division business.

Prior to IBM, Dr. Vlasov developed semiconductor nanophotonics at the NEC Research Institute in Princeton, and at the Strasbourg IPCMS Institute, France. He also was, for over a decade, a Research Scientist with the Ioffe Institute of Physics and Technology in St. Petersburg, Russia working on optics of nanostructured semiconductors. He received his MS from the University of St.Petersburg (1988) and PhD from the Ioffe Institute (1994), both in physics.

Dr. Vlasov has published over 150 highly cited journal and conference papers, filed over 50 US patents, and delivered over 150 invited and plenary talks in the area of nanophotonics. He served on numerous organizing committees of conferences on nanophotonics under OSA, IEEE, LEOS, APS, MRS, etc. Dr. Vlasov was elected a Fellow of both the OSA and the APS, as well as a Senior Member of the IEEE. He was awarded several IBM Outstanding Technical Achievement Awards, 2011 “Best of IBM” Award and an IBM 2011 Corporate Award, and was named a “Scientist of the Year” by the Scientific American journal. For a few years Dr. Vlasov also served as an Adjunct Professor at Columbia University's Department of Electrical Engineering.


Solomon Asssefa

Solomon Assefa

Dr. Solomon Assefa is a Research Staff Member at the IBM T.J. Watson Research Center. His research contributions include CMOS-integrated silicon nanophotonics for optical interconnects, high-speed Germanium receivers, and nano-structured silicon-platforms for quantum communication, information processing, and bio-sensing.

Dr. Assefa is a member of the Optical Society of America (OSA), the American Physical Society (APS), and the Institute of Electrical and Electronics Engineers (IEEE). He has served as committee chair and workshop organizer for various conferences including the Optical Fibers Conference (OFC) and Conference on Lasers and Electro-Optics (CLEO).

Assefa is a recipient of several awards for his research contributions, which include: Technical Accomplishment Award, Corporate Recognition Award, and several Invention Achievement Awards from IBM. In 2011, he was named one of the World’s Top Young Innovators under 35 and received the prestigious TR35 awarded by MIT’s Technology Review.

Assefa was a key member involved in the strategy of the recently launched IBM Research Lab in Kenya, IBM’s first in the African continent. He is actively involved in the expansion of IBM’s presence in Africa by working on strategies and leading collaborative projects involving various IBM divisions.

Assefa received B.S. in physics, B.S. in EECS, and M.S. in EECS in 2001 from the Massachusetts Institute of Technology (MIT). He joined IBM in 2004 after receiving a Ph.D. from MIT.


William M. J. Green

William M. J. Green

Dr. William Green is a Research Staff Member at the IBM Thomas J. Watson Research Center. His current research activities encompass the design and systems-level characterization of CMOS-integrated silicon nanophotonic devices and sub-systems, for short-reach optical interconnects and on-chip optical networks. Other research endeavors include the study of highly nonlinear silicon waveguide devices for all-optical parametric signal processing and broadband mid-infrared light source generation.

Dr. Green holds a Ph.D. in Electrical Engineering from the California Institute of Technology, and a B.Sc. in Engineering Physics from the University of Alberta, Canada.


Tymon Barwicz

Tymon Barwicz

Dr. Tymon Barwicz joined the IBM Thomas J. Watson Research Center in 2006. His research interests include shape and dimensional control of sub-10-nm silicon nanowires as well as their applications to FETs, NEMS and photovoltaics. His current research focus is on design and fabrication of low-cost silicon-nanophotonic-to-optical-fiber interfaces and their high-volume integration with microelectronic packaging.

He received the B.Eng. degree in engineering physics from the Ecole polytechnique de Montral, Canada, in 2000 and a joint M.Sc./Ph.D. degree in materials science and engineering at the Massachusetts Institute of Technology (MIT) in 2005. His doctoral dissertation focused on accurate nanofabrication techniques for strong-confinement microphotonic devices. Then, he was a postdoctoral associate at MIT leading nanofabrication of silicon photonic reconfigurable add-drop multiplexers before joining IBM in late 2006. He was born in Warsaw, Poland.


Jessie Rosenberg

Jessie Rosenberg

Dr. Jessie Rosenberg is currently a Research Staff Member in the Silicon Photonics team at the IBM TJ Watson Research Center. She joined the team in 2010, and her research efforts are focused on improving CMOS-compatible silicon electro-optic modulation technology for use in inter- and intra-chip low power, high speed, and high bandwidth optical interconnects.

She received an A.B. degree in Physics from Bryn Mawr College in 2004, and went on to receive a Ph.D. degree in Applied Physics from the California Institute of Technology in 2010 for her research on plasmon-enhanced mid-infrared photodetectors and cavity optomechanics of double-disk microresonators.


Jonathan Proesel

Jonathan Proesel

Dr. Jon Proesel is a Postdoctoral Researcher at the IBM T. J. Watson Research Center. He joined the silicon integrated nanophotonics team in May 2010. His current research is on analog and mixed-signal circuit design for fully-integrated silicon photonics. His research interests include high-speed optical and electrical I/Os and data converters.

Dr. Proesel received a B.S. degree in computer engineering from the University of Illinois at Urbana-Champaign in 2004 and M.S. and Ph.D. degrees from Carnegie Mellon University in 2008 and 2010, respectively. His doctoral work focused on statistical and combinatorial circuit design techniques for analog and mixed-signal circuits


Former team members


Min Yang

Min Yang

Dr. Min Yang is a Research Staff Member at the IBM TJ Watson Research Center. She joined the Silicon Photonics team in 2009 and had been driving activities to integrate Photonics with Silicon CMOS in manufacturing environment.

Dr. Yang joined IBM Semiconductor Research and Development Center (SRDC) at East Fishkill, New York in 1999 as an integration engineer for 90nm DRAM technology. She became a Research Staff Member at IBM Watson Research Center in 2001 to design and fabricate exploratory semiconductor devices. Her major accomplishment included hybrid-orientation technology for high performance CMOS, high speed silicon lateral trench photodetector, and phase change memory. During 2007 and 2008, she worked at IBM SRDC, first as technical assistant to the Vice President and then as a manager of 32nm embedded DRAM. Dr. Yang received her Ph.D. degree in Electrical Engineering from Princeton University in 2000. She received her M.S. and B.S. degrees in Physics from Fudan University and Nanjing University in China respectively.

Dr. Yang has over 50 publications and over 30 US patents. She was awarded IBM Master Inventor in 2006. She served as committee member and chair for International Electron Devices Meeting (IEDM) between 2005 and 2007. She is a senior member of IEEE.


Jin Hong Park

Jin Hong Park

Dr. Jin-Hong Park joined Thomas J. Watson Research Center in Yorktown Heights, NY in August 2009 as a Postdoctoral Scientist. His research focused on integration of germanium photodetector for on-chip optical interconnects.

He received a B.S. degree in Electrical Engineering from Sung-Kyun-Kwan University (South Korea) in 2004. In 2006 and 2009, he was awarded M.S. / Ph.D. degree in Electrical Engineering from Stanford University, for his work on physics and technology of low temperature germanium MOSFETs for monolithic 3D-ICs.

In early 2010 he moved back to South Korea as a university professor.

Joris van Campenhout

Joris van Campenhout

Dr. Joris Van Campenhout joined Thomas J. Watson Research Center in Yorktown Heights, NY in September 2007 as a Postdoctoral Scientist. He was working on electro-optic and thermo-optic devices for low-power switching in on-chip optical networks.

He received a Masters degree in Engineering Physics from Ghent University in 2002. In 2007, he was awarded the Ph.D. degree in Electrical Engineering from the same institution, for his work on electrically injected micro-disk lasers on a heterogeneous InP-Si platform.

In the early 2010 Joris moved back to Belgium and is currently working at IMEC on further development of silicon photonics.

Fengnian Xia

Fengnian Xia

Dr. Fengnian Xia was a Postdoctoral Scientist in the Silicon Nanophotonics group in 2005-2007. He was developing micro-ring resonators, photonic crystals, and high bandwidth waveguide photodiodes on SOI substrate.

He received the B.Eng. degree (with honors) in electronics engineering from Tsinghua University, Beijing, China, in 1998 and M.A and Ph.D. degrees in electrical engineering from Princeton University, Princeton, NJ, in 2001 and 2005, respectively. His Ph.D. thesis is about monolithic integration of light guiding, generation and detection components on III-V substrate.

He is a member of IEEE and OSA. He authored and coauthored thirteen journal papers and many international conference presentations. He was granted one US patent and has several patents pending.

In 2007 Dr.Xia , now as a regular IBM employer in Physical Sciences Department, switched to work on carbon nanotube photonics.


Eric Dulkeith

Eric Dulkeith

Dr. Eric Dulkeith was a Postdoctoral Scientist with IBM TJ Watson Research Center in 2004-2006. He was engaged in the characterization of SOI-type two-dimensional photonic crystals and waveguides.

He received his B.S. and M.S degrees in Physics from the University of Munich, Germany, in 1995 and 1999, respectively. His field of research was to investigate collective proton motions in protein layers by using THz spectroscopy.

In 2000, he joined the Photonics and Optoelectronics Group of Prof. J. Feldmann at the University of Munich and obtained his Ph.D. (summa cum laude) in 2004 on the optical properties of hybrid systems consisting of metal nanoparticles and fluorescent molecules. In parallel to his thesis he was working on II-VI semiconductor nanoparticles systems.

Eric is currently working at Detecon, Telecommunications Business and Strategy.


Lidija Sekaric

Lidija Sekaric

Dr. Lidija Sekaric is a Research Staff Member in Nanostructures and Exploratory Devices group in Silicon Technology. Her research interests lie in the area of nanofabrication of microphotonic circuits and CMOS devices alike. Most recently she developed hybrid optical and electon beam lithography to build world's smallest SRAM cell.

She has a Ph. D. from Cornell Univeristy (2003) in Applied Physics where she studied nanomechanical resonant structures (NEMS) and built world's smallest playable nanoguitar.


Sharee J. McNab

Sharee J. McNab

Dr. Sharee McNab has been a Research Staff Member at the IBM Thomas J. Watson Research Center in 2001-2005. She was working in the field of silicon based micro-photonics and fabrication of exploratory CMOS at the scaling limits.

Dr.McNab graduated with a B.E. (Hons) degree from the University of Canterbury, New Zealand, in 1994 and a Ph.D. degree in Electrical and Electronic Engineering also from the University of Canterbury in 2001. Her thesis was entitled “Evanescent Near-Field Optical Lithography –Overcoming the Diffraction Limit”. Between her undergraduate and graduate degrees she was employed as a software engineer at The Technology Partnership in Cambridge in the UK.

She is currently back in her alma mater University of Canterbury working as a visiting professor.


Martin O'Boyle

Martin O'Boyle

Martin O'Boyle is an Electrical Engineer in Physical Sciences Department with over 23 years of employment history at IBM. During these years he has been involved in a number of projects including fiber optic development for high end servers, scanning atomic force microscopy, in situ optical sensors development for manufacturing and experimentation, test/measurement equipment automation, and experimental evaluation of photonic structures. He received his Master of Science from the University of Delaware (1982) in Electrical Engineering.