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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Journal ArticleDOI
Non-contact Respiratory Anomaly Detection using Infrared Light Wave Sensing
TL;DR: In this article , two machine learning algorithms, decision tree and random forest, were applied to detect breathing anomalies and faulty data, and the highest classification accuracy was achieved with the data collected at 0.5m distance using decision tree model.
Posted Content
Gesture Recognition using Reflected Visible and Infrared Light Wave Signals.
TL;DR: The ability to recognize hand gestures in a non-contact, wireless fashion using only incoherent light signals reflected from a human subject is demonstrated using a light-wave-based gesture recognition system.
Proceedings ArticleDOI
Ultrafast broadband mid-infrared pump, terahertz probe spectroscopy
Keshav M. Dani,John F. O'Hara,Q. McCulloch,Frank Chen,Abul Kalam Azad,Georgi L. Dakovski,Scott A. Crooker,A. J. Taylor,Rohit P. Prasankumar +8 more
TL;DR: In this paper, a novel ultrafast optical system capable of directly pumping low energy excitations in complex materials and probing the photoinduced changes in their properties with terahertz pulses, benchmarked through mid-infrared-pump, THz-probe measurements on InSb
Proceedings ArticleDOI
Broadening of fundamental resonance via nested resonators in terahertz metamaterial
Dibakar Roy Chowdhury,Ranjan Singh,Matthew T. Reiten,Hou-Tong Chen,Antoinette J. Taylor,John F. O'Hara,Abul Kalam Azad +6 more
TL;DR: In this paper, the authors demonstrate broadening of fundamental resonance by successive insertion of rings inside of a split ring resonator (SRR) in a nested fashion, with the maximum inner rings, the resonance linewidth broadens by a factor of four.
Proceedings ArticleDOI
Electronically switchable extraordinary terahertz transmission through metallic hole arrays fabricated on a semiconductor substrate
Hou-Tong Chen,Hong Lu,Abul Kalam Azad,John F. O'Hara,Arthur C. Gossard,Richard D. Averitt,A. J. Taylor +6 more
TL;DR: In this paper, a switchable extraordinary terahertz transmission through sub-wavelength metallic hole arrays fabricated on doped semiconductor substrates was demonstrated, where a reverse voltage bias results in a controllable depletion thus tuning the substrate loss and switching the transmission.