Steven M. Anlage

Publications (227) View all

• Article: In situ broadband cryogenic calibration for two-port superconducting microwave resonators.

  Jen-Hao Yeh, Steven M Anlage
  [show abstract] [hide abstract]
  ABSTRACT: We introduce an improved microwave calibration method for use in a cryogenic environment, based on a traditional three-standard calibration, the Thru-Reflect-Line (TRL) calibration. The modified calibration method takes advantage of additional information from multiple measurements of an ensemble of realizations of a superconducting resonator, as a new pseudo-Open standard, to correct errors in the TRL calibration. We also demonstrate an experimental realization of this in situ broadband cryogenic calibration system utilizing cryogenic switches. All calibration measurements are done in the same thermal cycle as the measurement of the resonator (requiring only an additional 20 min), thus avoiding 4 additional thermal cycles for traditional TRL calibration (which would require an additional 12 days). The experimental measurements on a wave-chaotic microwave billiard verify that the new method significantly improves the measured scattering matrix of a high-quality-factor superconducting resonator.
  The Review of scientific instruments 03/2013; 84(3):034706. · 1.52 Impact Factor
• Article: Imaging the Anisotropic Nonlinear Meissner Effect in Nodal YBa_{2}Cu_{3}O_{7-δ} Thin-Film Superconductors.

  Alexander P Zhuravel, B G Ghamsari, C Kurter, P Jung, S Remillard, J Abrahams, A V Lukashenko, Alexey V Ustinov, Steven M Anlage
  [show abstract] [hide abstract]
  ABSTRACT: We have directly imaged the anisotropic nonlinear Meissner effect in an unconventional superconductor through the nonlinear electrodynamic response of both (bulk) gap nodes and (surface) Andreev bound states. A superconducting thin film is patterned into a compact self-resonant spiral structure, excited near resonance in the radio-frequency range, and scanned with a focused laser beam perturbation. At low temperatures, direction-dependent nonlinearities in the reactive and resistive properties of the resonator create photoresponse that maps out the directions of nodes, or of bound states associated with these nodes, on the Fermi surface of the superconductor. The method is demonstrated on the nodal superconductor YBa_{2}Cu_{3}O_{7-δ} and the results are consistent with theoretical predictions for the bulk and surface contributions.
  Physical Review Letters 02/2013; 110(8):087002. · 7.37 Impact Factor
• Article: Nonlinear time reversal in a wave chaotic system.

  Matthew Frazier, Biniyam Taddese, Thomas Antonsen, Steven M Anlage
  [show abstract] [hide abstract]
  ABSTRACT: Exploiting the time-reversal invariance and reciprocal properties of the lossless wave equation enables elegantly simple solutions to complex wave-scattering problems and is embodied in the time-reversal mirror. Here we demonstrate the implementation of an electromagnetic time-reversal mirror in a wave chaotic system containing a discrete nonlinearity. We demonstrate that the time-reversed nonlinear excitations reconstruct exclusively upon the source of the nonlinearity. As an example of its utility, we demonstrate a new form of secure communication and point out other applications.
  Physical Review Letters 02/2013; 110(6):063902. · 7.37 Impact Factor
• Article: Nanoscale Electrodynamic Response of Nb Superconductors

  Tamin Tai, Behnood G. Ghamsari, Steven M. Anlage
  [show abstract] [hide abstract]
  ABSTRACT: Our objective is to study the extreme and local electrodynamic properties of Niobium (Nb), and to relate these properties to specific defects that limit the ultimate RF performance of superconducting radio frequency (SRF) cavities made from Nb. Specifically, we wish to develop a microscopic measure of the response of Nb to RF magnetic fields up to the critical field (Hc) at microwave frequencies (few GHz), and at temperatures down to 4.2 K. In order to image the local electromagnetic response in the GHz frequency regime, a magnetic writer from a commercial hard drive is integrated into the near field microwave microscope and operates with the Nb sample in the superconducting state. The microwave response of Nb thin films from a mesoscopic area are found through linear and nonlinear microwave measurements.
  11/2012;
• Article: High-Temperature Superconducting Multi-Band Radio-Frequency Metamaterial Atoms

  Behnood G. Ghamsari, John Abrahams, Steven M. Anlage
  [show abstract] [hide abstract]
  ABSTRACT: We report development and measurement of a micro-fabricated compact high-temperature superconducting (HTS) metamaterial atom operating at a frequency as low as $\sim$ 53MHz. The device is a planar spiral resonator patterned out of a {YBa$_2$Cu$_3$O$_{7-\delta}$} (YBCO) thin film with the characteristic dimension of $\sim \lambda_0/1000$, where $\lambda_0$ is the free-space wavelength of the fundamental resonance. While deployment of an HTS material enables higher operating temperatures and greater tunability, it has not compromised the quality of our spiral metamaterial atom and a Q as high as $\sim 1000$ for the fundamental mode, and $\sim 30000$ for higher order modes, are achieved up to 70K. Moreover, we have experimentally studied the effect of the substrate by comparing the performance of similar devices on different substrates.
  10/2012;