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ESE PhD Dissertation Defense: “Enhanced Nonlinearity Enabled via Doped ENZ Metastructures: Theory & Potential Applications”

February 18 at 1:00 PM - 3:00 PM

Synthetic composite structures, known as metamaterials, have been increasingly applied in
the past two decades in numerous applications for obtaining electromagnetic characteristics far beyond
naturally occurring materials. In particular, epsilon-near-zero (ENZ) media are a special category of
metamaterials which have been shown to exhibit exotic wave-matter interaction properties, rendering
them suitable for numerous applications. Exploiting the distinctive property of spatial uniformity of the
magnetic field in 2D ENZ (i.e. infinitely extended along a given direction) media, it has been recently
theoretically and experimentally demonstrated that a 2D ENZ body doped with a dielectric inclusion is
equivalent to a magnetic ENZ medium for an outside observer, a concept coined “photonic doping”. In
this dissertation, I theoretically extend this concept for additional classes of inclusions and propose
several potential applications harnessing the peculiar electromagnetic characteristics of such structures.

Ehsan Nahvi

Ph.D. Candidate

Ehsan received his bachelor’s degree in electrical engineering from Sharif University of Technology,
Iran in 2016. He is currently a PhD student in the Engheta Lab, in the ESE Department at the University of Pennsylvania. His doctoral research has been focused on a theoretical investigation of exotic metamaterials, enabled by doping Epsilon-Near-Zero media, for several potential applications. As part of his graduate studies, he has modeled, designed, and optimized nanostructures and metasurfaces for real-life applications, namely infrared photodetectors and anticounterfeiting products, during two internships.


February 18
1:00 PM - 3:00 PM
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Zoom – Email nahvi@seas.upenn.edu for link


Electrical and Systems Engineering