Room-temperature masers are the main focus of Jonathan's current research activities, but he is also active in the fields of theory and simulation of materials, electromagnetic fields and their interaction.
Jonathan studied Astrophysics at Leeds University, then worked at the National Physical Laboratory (NPL) in the Quantum Metrology division, before joining Matra-Marconi Space Systems and British-Aerospace Space Systems (now Airbus Space & Defence) as a Microwave Design Engineer.
He worked on a number of satellite programs as Responsible Engineer for passive microwave payloads and also conducted research into state-of-the-art passive microwave components: using materials such as high temperature superconductors (HTS) and advanced microwave ceramic dielectrics.
He returned to academia to join Prof. Neil Alford's group where he conducted fundamental research into microwave dielectric ceramics, culminating in a PhD on the theory and experiment of microwave losses in single-crystal ceramics.
He developed a microwave photonic-crystal cavity with record Q-factor that led to the research into room-temperature masers. This resulted in the first demonstration of a pulsed room-temperature maser using an optically excited single-crystal of pentacene-doped para-terphenyl. Further research led to the observation of strong-coupling in masers and the demonstration of the first continuously-operating room-temperature maser using optically-pumped diamond containing nitrogen-vacancy defects.
et al., 2018, Continuous-wave room-temperature diamond maser, Nature, Vol:555, ISSN:0028-0836, Pages:493-+
et al., 2017, Room-temperature cavity quantum electrodynamics with strongly coupled Dicke states, Npj Quantum Information, Vol:3, ISSN:2056-6387
et al., 2015, Enhanced magnetic Purcell effect in room-temperature masers, Nature Communications, Vol:6, ISSN:2041-1723
Oxborrow M, Breeze JD, Alford NM, 2012, Room-temperature solid-state maser, Nature, Vol:488, ISSN:0028-0836, Pages:353-+