Thickness Dependent Control of AZO and TiN Optical Properties

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CONTROLLING THE PROPERTIES OF HOMOGENEOUS EPSILON NEAR ZERO MATERIALS AND THEIR SWITCHING BEHAVIOR

thesis
posted on 28.04.2022, 20:47 by Mustafa Goksu OzluMustafa Goksu Ozlu

One of the longstanding goals of photonics research has been to obtain strong optical nonlinearities. A promising method to achieve this goal is to operate in the so-called epsilon near zero (ENZ) spectral regime, where the real part of the dielectric permittivity changes sign. If accompanied by low losses, this region enables a platform to achieve extraordinarily high nonlinear response, along with many other interesting optical phenomena. In this work, some of the common all-optical switching structures employing homogeneous ENZ materials are investigated under varying conditions of frequency, incidence angle, and polarization. The optimum switching conditions have been highlighted to pave the way forward to the best experimental configurations in future studies. Moreover, the properties of some of the emerging novel plasmonic materials such as aluminum-doped zinc oxide (AZO) and titanium nitride (TiN) are investigated, specifically for ENZ applications. Their thickness-dependent crystalline structure and carrier densities are employed as a method to control their optical properties. A near-perfect absorption scheme is demonstrated utilizing the Ferrell-Berreman mode occurring at the ENZ region of ultrathin AZO and TiN film. The ENZ frequency and the associated absorption peak of AZO are engineered through thickness-dependence to cover most of the telecom range. This work covers the theoretical background for ENZ nonlinearities and looks into the materials aspect for better control of nonlinearities in experimental realizations.

Funding

Opening New Frontiers of Near-Zero-Index (NZI) Optics: from Photonic Time Crystals to Non-Reciprocity and Novel Localization Regimes

Basic Energy Sciences

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Extreme Nonlinear Optics with Low-Index Materials

United States Department of the Navy

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Space-Time Photonic Metamaterials: From Design and Materials to Device Concepts

United States Air Force

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History

Degree Type

Master of Science in Electrical and Computer Engineering

Department

Electrical and Computer Engineering

Campus location

West Lafayette

Advisor/Supervisor/Committee Chair

Vladimir M. Shalaev

Advisor/Supervisor/Committee co-chair

Alexandra Boltasseva

Additional Committee Member 2

Alexander Kildishev