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.
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Emulating UAV Motion by Utilizing Robotic Arm for mmWave Wireless Channel Characterization
Amit Kachroo,Collin A. Thornton,Arifur R. Sarker,Wooyeol Choi,He Bai,Ickhyun Song,John F. O'Hara,Sabit Ekin +7 more
TL;DR: Millimeter wave (mmWave) wireless channel characteristics for Unmanned Aerial Vehicles (UAVs) assisted communication is analyzed and studied by emulating the real UAV motion using a robotic arm to find the Doppler spread experienced by the UAV hovering motion under the Dryden wind turbulence.
Proceedings ArticleDOI
A Novel Approach of Antireflection Coating Using Planar Metamaterials
TL;DR: In this article, a novel antireflection coating using planar metamaterials is presented. But it is not suitable for the use in a wide range of incidence angles for both polarizations near the designed wavelengths.
Proceedings ArticleDOI
Reflective geometry THz imaging
TL;DR: In this paper, the authors used free-space pulses of terahertz (THz) radiation to image nonuniform, opaque objects in a reflection geometry where the THz beam illuminates the target and its reflections are collected and measured.
Proceedings ArticleDOI
Active THz metamaterials
John F. O'Hara,Hou-Tong Chen,Abul Kalam Azad,E. Simrnova,Willie J. Padilla,Richard D. Averitt,A. J. Taylor +6 more
TL;DR: In this article, the authors demonstrate THz metamaterials exhibiting either amplitude control via carrier injection or depletion in the active semiconductor substrate or frequency control via photoexcitation of carriers into active semiconducting materials incorporated into the sub-wavelength metammaterial structure.
Journal ArticleDOI
Towards Non-Contact Glucose Sensing in Aqueous Turbid Medium at ∼1.1 Meters Distance
TL;DR: In this article, a non-contact diffuse reflectance approach with a working distance of ∼1.1 meters was developed according to a center-illumination-area-detection (CIAD) geometry.