J
John F. O'Hara
Researcher at Oklahoma State University–Stillwater
Publications - 162
Citations - 11041
John F. O'Hara is an academic researcher from Oklahoma State University–Stillwater. The author has contributed to research in topics: Terahertz radiation & Metamaterial. The author has an hindex of 39, co-authored 154 publications receiving 9750 citations. Previous affiliations of John F. O'Hara include Los Alamos National Laboratory & University of Sheffield.
Papers
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Proceedings ArticleDOI
Tunnel-diode loaded split-ring resonators as a foundation for nonlinear metamaterials
John F. O'Hara,John F. O'Hara,Matthew T. Reiten,P. Colestock,L.M. Earley,Antoinette J. Taylor +5 more
TL;DR: In this paper, tunnel-diode loaded, microwave split-ring resonators are shown to enable various nonlinear phenomena including self-sustained oscillation, harmonic/comb generation, frequency locking/pulling, and quasi-chaos generation.
Journal ArticleDOI
Emulating UAV Motion by Utilizing Robotic Arm for mmWave Wireless Channel Characterization
Amit Kachroo,Collin A. Thornton,Md. Arifur Rahman Sarker,Wooyeol Choi,He Bai,Ickhyun Song,John F. O'Hara,Sabit Ekin +7 more
TL;DR: In this paper, the authors proposed a framework of emulating UAV motion for mmWave communication systems, which will pave the way out for future design and implementation of next-generation UAV-assisted wireless communication systems.
Proceedings ArticleDOI
Chiral THz metamaterial with tunable optical activity
TL;DR: In this article, tunable optical activity in chiral metamaterials is demonstrated in simulation and shows actively tunable giant polarization rotation over a wide frequency band in a wide range of applications.
Journal ArticleDOI
A method to determine effective metamaterial properties based on stratified metafilms
TL;DR: In this article, a simple model based on stratified systems is presented to illustrate this fact and further assists in the interpretation of novel metamaterial behaviors and offers a rapid and accurate method to determine the functionality of bulk metammaterial-based devices.
Proceedings ArticleDOI
Split-Ring Resonator Enhanced Terahertz Antenna
TL;DR: In this paper, an electric split-ring resonator was used to enhance the performance of a photoconductive dipolar antenna based terahertz transmitter, where the enhancement was observed near and limited to the resonant frequency of the electric split ring resonator.