“Enhancement of Magneto-Optical Effects in Gyrotropic Photonic Bandgap Materials”
Wednesday, May 26th 2010 / 3:00-4:00pm
CREOL Room 102
Dr. A.A. Jalali
Research Physicists
Electro-Optics Technology, Inc
ABSTRACT:
A.A. Jalali Magneto-optic materials have many applications in a large
variety of areas of integrated optics. Perhaps the most common
application of magneto-optic materials is in the construction of
nonreciprocal waveguides and magneto-optic isolators although there are
also many applications in other areas of integrated optics such as
magneto-optical fast switching, magneto-optical read-out disks, and
magneto-optical sensors and visualizers. All of these applications are
based on the magneto-optical activity of the material like polarization
rotation of the light passing through the medium (Faraday rotation) and
magneto-optical tunability of the medium. Magneto-optical effects can be
enhanced significantly in a periodic structure, the so called photonic
crystals, that exhibit photonic bandgaps. The enhancement of
magneto-optical effects would thus allow large improvements in existing
applications and even more open up new possibilities for advanced sensor
devices and optical filters. In this talk I will present a study of
polarization rotation enhancement in one- and twodimensional photonic
crystals and provide theoretical and experimental support for a novel
type of photonic bandgap in birefringent magneto-optic photonic crystal
waveguides. Contradirectional coupling of fundamental to higher order
local normal modes in birefringent magneto-optic photonic crystal
waveguides leads to partially overlapping gyrotropic bandgaps inside the
Brillouin zone. This type of photonic bandgap and degeneracy breaking
inside the Brillouin zone are a result of the local coupling between
different elliptically polarized photonic states in magneto-photonic
crystals. While linear birefringence suppresses the Faraday rotation in
magneto-optic waveguides, large magnetically active changes in
polarization rotation near the band edges are observed in the
magneto-optic photonic crystal waveguides.
BIOGRAPHY:
Dr. Jalali received the PhD degree in Physics from the Royal Institute
of Technology (KTH), Stockholm, Sweden, in 2005. He spent three years as
a Research Scientist at the Michigan Technological University, Michigan.
In 2009, He was a Visiting Research Scientist in the Center for Quantum
Devices at Northwestern University, Illinois. Currently, he is a
Research Physicists with Electro-Optics Technology, Inc, Michigan. His
research interests include magneto-optic photonic crystals, photonic
materials, computational electromagnetics, photonic biosensors, and
magneto-photonic devices.
FOR MORE INFORMATION:
Larry Shah
407-823-6910
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