Engineering Active Photonic Devices and Networks

Date: 11:00am, February 16, 2017
Location:  Davis Auditorium, CEPSR 412
Speaker: Dr.Hakan E Tureci, Assistant Professor, Princeton University

Abstract:  Nano-patterned photonic materials have revolutionized the way light is generated and transported on chip-scale structures. Incorporating active components opens up a different design dimension for integrated optical circuits, enabling entirely new functionalities for transport and generation of light. I will discuss our theoretical efforts in this direction leveraging spatial and temporal modulation of the real and imaginary parts of the refractive index of photonic materials. The dynamical evolution of these systems are generally described by non-Hermitian operators and the spectral properties of such operators permit a much richer range of dynamical behavior than those described by Hermitian or normal operators. First I will focus on our work on large-area microlasers where we have shown how spatially selective pumping can control the emission directionality, frequency and threshold. Next, I will discuss an interesting dynamical regime of a coupled laser system, related to a special degeneracy (“exceptional point”) of the associated non-Hermitian operator, that can be accessed via differential pumping of individual elements. This proposal was recently realized with THz quantum cascade lasers. Finally, I will discuss the design of a network of electromagnetic oscillators for on-chip non-reciprocal routing of light. By virtue of the reliance of this scheme on spatial and temporal modulation of network parameters, we are able to demonstrate general design principles for reconfigurable, point-to-point transport of light on the network that is immune to backscattering.

Biography: 
  Hakan E Tureci is an Assistant Professor in the Department of Electrical Engineering at Princeton University. Prior to joining Princeton faculty, he obtained his BS (Physics) from Bilkent University and received his Ph.D. (Physics) from Yale University in 2003 for his dissertation on mesoscopic optics. He did his postdoctoral work at Yale University and at ETH Zurich. In 2009, he was appointed SNF Professor at ETH. He moved to Princeton University in 2010. His research focuses on theoretical problems in quantum optics, photonics and lasers, in particular non-equilibrium dynamics in classical and quantum collective systems. He is the recipient of the NSF CAREER Award and the DARPA Young Faculty Award.


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