Monday, May 17, 2010

SEMINAR: 5.26.10 / CREOL 102 / 3:00-4:00pm / “Enhancement of Magneto-Optical Effects in Gyrotropic Photonic Bandgap Materials”

“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


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.


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.


Larry Shah


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