title: Tunable Broadband Radiation Generated Via Ultrafast Laser Illumination of an Inductively Charged Superconducting Ring.
abstract: An electromagnetic transmitter typically consists of individual components such as a waveguide, antenna, power supply, and an oscillator. In this communication we circumvent complications associated with connecting these individual components and instead combine them into a non-traditional, photonic enabled, compact transmitter device for tunable, ultrawide band (UWB) radiation. This device is a centimeter scale, continuous, thin film superconducting ring supporting a persistent super-current. An ultrafast laser pulse (required) illuminates the ring (either at a point or uniformly around the ring) and perturbs the super-current by the de-pairing and recombination of Cooper pairs. This generates a microwave pulse where both ring and laser pulse geometry dictates the radiated spectrum's shape. The transmitting device is self contained and completely isolated from conductive components that are observed to interfere with the generated signal. A rich spectrum is observed that extends beyond 30 GHz (equipment limited) and illustrates the complex super-current dynamics bridging optical, THz, and microwave wavelengths.
authors.affiliation: Department of Materials Science and Metallurgy, University of Cambridge, UK.
authors.forename: John
authors.initials: J
authors.lastname: Bulmer
authors.affiliation: Aerospace Systems Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio, USA, 45433.
authors.forename: Thomas
authors.initials: T
authors.lastname: Bullard
authors.affiliation: Physics Department, University of Dayton, 300 College Park, Dayton, Ohio, USA, 45469.
authors.forename: Brian
authors.initials: B
authors.lastname: Dolasinski
authors.affiliation: Institute for Manufacturing, Department of Engineering, University of Cambridge, UK, CB3 0FS.
authors.forename: John
authors.initials: J
authors.lastname: Murphy
authors.affiliation: Institute for Manufacturing, Department of Engineering, University of Cambridge, UK, CB3 0FS.
authors.forename: Martin
authors.initials: M
authors.lastname: Sparkes
authors.affiliation: Institute for Manufacturing, Department of Engineering, University of Cambridge, UK, CB3 0FS.
authors.forename: Krste
authors.initials: K
authors.lastname: Pangovski
authors.affiliation: Institute for Manufacturing, Department of Engineering, University of Cambridge, UK, CB3 0FS.
authors.forename: William
authors.initials: W
authors.lastname: O'Neill
authors.affiliation: Physics Department, University of Dayton, 300 College Park, Dayton, Ohio, USA, 45469.
authors.forename: Peter
authors.initials: P
authors.lastname: Powers
authors.affiliation: Aerospace Systems Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio, USA, 45433.
authors.forename: Timothy
authors.initials: T
authors.lastname: Haugan