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Biography

Jonathan Hu received Ph.D. degree from University of Maryland, Baltimore County. Before he joined Baylor University as an Assistant Professor in Aug. 2011, he spent two years as a research associate at Princeton University. His research interests include nanophotonics, surface plasmon, light-emitting diode, electromagnetic wave, nonlinear optics, photonic crystal fiber, supercontinuum generation, and quantum optical communication.

Abstract

In this talk, I will focus on the research for mid-IR supercontinuum generation using chalcogenide photonic crystal fibers. I will describe a procedure for maximizing the bandwidth of super continuum generation in chalcogenide fibers and the physics behind this procedure. I show that it is possible to generate an optical bandwidth of more than 4 µm with an input pump wavelength of 2.5 µm using a chalcogenide fiber. Obtaining this bandwidth requires a careful choice of the fiber’s waveguide parameters and input pulse power, which determines respectively the fiber’s dispersion and non linearity. I will also show the simulation results for super continuum generation using tapered chalcogenide photonic crystal fibers. I demonstrate that an increased soliton self-frequency shift can be achieved using a tapered PCF. The overall bandwidth can be increased from 2.5 µm to 3.6 µm by using a tapered PCF. However, the ratio of the output power in the region between 3 and 5 µm to the input power decreases in a tapered fiber because of the increased fiber leakage loss.

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