John F O'Hara

Title: John F O'Hara: Innovator in Metamaterials

Introduction

John F O'Hara is a prominent inventor based in Los Alamos, NM (US). He has made significant contributions to the field of metamaterials, holding a total of 3 patents. His work focuses on dynamic frequency tuning and terahertz metamaterials, which have the potential to revolutionize various applications in electromagnetic technology.

Latest Patents

One of his latest patents is titled "Dynamic frequency tuning of electric and magnetic metamaterial response." This invention features a geometrically modifiable resonator that is placed on a substrate. The resonator can achieve active optical and/or electronic control of the frequency response in metamaterials and frequency-selective surfaces, potentially with sub-picosecond response times. The methods described can also be applied to discrete geometrically modifiable circuit components, such as inductors and capacitors. Controlled conductivity regions, utilizing reversible photodoping or voltage-induced depletion activation, modify the geometries of circuit components, allowing frequency tuning of resonators without affecting the bulk substrate's electrical properties. This concept is applicable across any frequency range where metamaterials are designed to operate.

Another significant patent is related to "Terahertz metamaterials." These metamaterials consist of a periodic array of resonator elements on a dielectric substrate or thin membrane. The resonator elements are structured to provide tunable magnetic permeability or electric permittivity for incident electromagnetic radiation at frequencies exceeding 100 GHz. The periodic array has a lattice constant smaller than the wavelength of the incident radiation. Microfabricated metamaterials exhibit lower losses and can be assembled into three-dimensional structures, enabling full coupling of incident electromagnetic terahertz radiation in multiple directions. This innovation allows for the development of polarization-sensitive and insensitive metamaterials at terahertz frequencies, paving the way for new devices and applications.

Career Highlights

John F O'Hara has worked with notable organizations, including Los Alamos National Security, LLC and Sandia Corporation. His experience in these institutions has allowed him to contribute to cutting-edge research and development in the field of metamaterials.

Collaborations

Throughout his career, O'Hara has collaborated with esteemed colleagues such as Richard Douglas Averitt and Willie John Padilla. These partnerships have further enhanced his research and innovation in metamaterials.

Conclusion

John F O'Hara is a distinguished