Abstract:
Photonic systems become more and more complicated in recent years. Modeling and simulation offer insights into finding optimum structures, guide experiments, and accelerate research cycle, in both microphotonic and nanophotonic area. In the first half of this talk, I will focus on microphotonic research for chalcogenide photonic crystal fiber. I will describe a procedure for maximizing the bandwidth of supercontinuum 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 with an air-hole-diameter-to-pitch ratio of 0.4 and a pitch of 3 μm. Obtaining this bandwidth requires a careful choice of the fiber’s waveguide parameters and the pulse’s peak power and duration, which determine respectively the fiber’s dispersion and nonlinearity. For the second half of this talk, I will focus on nanophotonic research, more specifically, nanodot effect on surface Plasmon resonant wavelength and field enhancement in disk-coupled dots-on-pillar antenna array. The existence of nanodots on the pillar sidewalls does not affect much of the resonant wavelengths of localized surface plasmons and propagating surface plasmons, but significantly increase enhancement factor by over two orders of magnitude.
Bio:
Jonathan Hu received the B.S. degree in electrical engineering from Zhejiang University, China, in 1997 and the PhD degree from the University of Maryland, Baltimore County, in 2008. Since May 2008, he has been a research associate at Princeton University. His research interests include optical amplifiers, chalcogenide-glass photonic crystal fibers, nanophotonics, and surface plasmons. He received the Chinese government award for outstanding self-financed students abroad in 2006, and the first place award in IEEE Baltimore and Washington-Northern Virginia LEOS chapter graduate student poster competition in 2008.
