The University of Massachusetts Amherst
University of Massachusetts Amherst

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Seminar: Professor Mohammad-Ali Miri

"Non-Hermiticity in Photonics and the Role Dissipation from Linear Spectra to Complex Nonlinear Dynamics:


Wednesday, October 2, 2019 - 4:00pm


Professor Mohammad-Ali Miri, Physics Department, Queens College of the City University of New York


Marston, Room 132


"Non-Hermiticity in Photonics and the Role Dissipation from Linear Spectra to Complex Nonlinear Dynamics"


Non-Hermiticity has been of great interest in recent years, particularly in connection with the quantum mechanical notion of parity-time symmetry, after the realization that Hamiltonians satisfying this special symmetry can exhibit entirely real spectra. These concepts have become of particular interest in photonics because optical gain and loss can be integrated and controlled in photonic structures, realizing an ideal platform for exploring non-Hermitian physics.

In this talk, first I will provide an overview of the fundamental concepts of non-Hermitian photonics and discuss exceptional points and the potential applications offered by the strong parameter dependence near these singularities. Next, I will discuss the influence of dissipative coupling on enforcing frequency synchronization between arrays of coupled lasers. In addition, I will outline the potential of utilizing dissipatively coupled laser arrays for classical computing.


Mohammad-Ali Miri is an Assistant Professor in the Department of Physics of Queens College of the City University of New York. He received B.Sc. and M.Sc. degrees both in Electrical Engineering from Shiraz University and Sharif University of Technology in 2008 and 2010 respectively and a Ph.D. in Optics from CREOL, the Center for Optics and Photonics, at the University of Central Florida where he received the Best Doctoral Dissertation Award in 2015. Between 2015 to 2018 he was a Postdoctoral Fellow in the Department of Electrical and Computer Engineering at the University of Texas at Austin.

His research interests are in the broad areas of optics and photonics, applied electromagnetics, light-matter interaction and nonlinear wave dynamics. He is particularly interested in the physics of parametric and active and passive non-Hermitian systems and their applications in integrated photonics. Prof. Miri has authored and co-authored more than 100 scientific contributions including over 40 published journal articles which have received considerable attention in the recent years.