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Guest Lecture "High-Gain Nonlinear Silicon Photonics at IR Wavelengths", Prof. Richard Osgood, Columbia University

Prof. Richard Osgood from Columbia University, on nonlinear optical properties of silicon photonic nanowires.
When Apr 19, 2012
from 11:00 AM to 01:00 PM
Where Barlow Room, 8th Floor, Roberts Building UCL
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Nonlinear effects in Si photonic wires at telecommunications wavelengths bands have been shown to provide a fascinating and useful medium for nonlinear optical physics and applications in data communications.  In this talk we will present recent nonlinear studies by our group at wavelengths 2000nm. In particular, two-photon absorption in Si vanishes at wavelengths approaching 2200 nm, while its nonlinear Kerr coefficient n2 remains nearly that in the telecommunications bands. Hence, the nonlinear figure of merit (FOM) increases dramatically near silicon’s above the two-photon absorption wavelength threshold. This large FOM produces an ideal platform for efficient, broadband, coherent nonlinear optical processes when incorporated into high-index-contrast dispersion-engineered photonic wires. This materials system can be used for chip-scale near-to-mid-IR applications including molecular spectroscopy, free-space communication, and environmental monitoring. In this talk, we will describe our work in a 4-mm-long Si wire near-to-mid-IR optical parametric amplifiers with on-chip gain over a 220 nm bandwidth and discuss attainment of broadband mid-IR modulation instability (MI) gain with a bandwidth >580 nm centered at a ~ 2170 nm pump wavelength. This intense MI spectrum correlates with unprecedented values, i.e. >40dB, of on-chip parametric gain.

About Professor Richard Osgood

Richard M. Osgood Jr. joined Columbia University in 1981 and became Higgins Professor of Electrical Engineering and Applied Physics in 1988. He served as an associate director of Brookhaven National Laboratory from 2000 to 2002 and its acting Nanocenter Director, 2002. Professor Osgood was, with Professor Yang, a cofounder of the Columbia Microelectronics Sciences Laboratories (MSL), and has served as director or codirector of MSL and the Columbia Radiation Laboratory (CRL). He is a member of the ACS and MRS, and a fellow of the IEEE, OSA, and the APS. He was coeditor of Applied Physics (1983~95) and associate editor of the IEEE Journal of Quantum Electronics (1981~88). Professor Osgood has served as a consultant to numerous research institutions and government agencies including MIT Lincoln Laboratory. He is also on the DARPA Defense Sciences Research Council (Materials Research Council) and the Los Alamos National Laboratory Visiting Advisory Board (Chemical Sciences and Technology Division). Professor Osgood has served as councilor of the Materials Research Society, as a member of the DOE Basic Energy Sciences Advisory Committee, and the scientific advisory board of Brookhaven National Laboratories. In 1991, Dr. Osgood received the R. W. Wood Award from the Optical Society of America, and was invited to deliver the OIDTA lecture at the Japanese Optical Association.