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Displaying 151 - 175 of 3057

Fiber-coupled Vapor Cell for a Portable Rydberg Atom-based RF Electric Field Sensor

August 1, 2018
Author(s)
Matthew T. Simons, Joshua A. Gordon, Christopher L. Holloway
We demonstrate a moveable Rydberg atom based radio frequency (RF) electric (E) field probe. The technique is based on electromagnetically-induced transparency (EIT) and Autler-Townes splitting. Two fibers attached to an 10mm cube Cs vapor cell are used to

10 T? and 100 T? Resistance Comparison between NIST and AIST

July 9, 2018
Author(s)
Dean G. Jarrett, Takehiko Oe, Nobu Kaneko, Shamith U. Payagala
We report the results of a comparison of 10 TΩ and 100 TΩ high resistance standards between the National Institute of Standards and Technology (NIST) and the National Institute for Advanced Industrial Science and Technology (AIST). Three standard resistors

Sub-nanosecond Tuning of Microwave Resonators Fabricated on Ruddlesden-Popper Dielectric Thin Films

July 9, 2018
Author(s)
Aaron M. Hagerstrom, Xifeng Lu, Natalie Dawley, H. Nair, Jordi Mateu, Robert D. Horansky, Charles A. Little, James C. Booth, Christian J. Long
Voltage-tunable dielectric materials are widely used for microwave-frequency signal processing. Among tunable dielectric thin films, (SrTiO3)nSrO Ruddlesden-Popper (RP) superlattices have exceptionally low loss at high frequencies. This paper reports the

Transport of NIST Graphene Quantized Hall Devices and Comparison with AIST Gallium-Arsenide Quantized Hall Devices

July 9, 2018
Author(s)
Dean G. Jarrett, Takehiko Oe, Randolph E. Elmquist, Nobu Kaneko, Albert F. Rigosi, Bi Y. Wu, Hsin Y. Lee, Yanfei Yang
We report the results of a pilot study where two graphene quantized Hall resistance (QHR) devices made at the National Institute of Standards and Technology (NIST) were hand carried from the USA to the National Institute for Advanced Industrial Science and

A Self-Calibrated Transfer Standard for Microwave Calorimetry

July 8, 2018
Author(s)
Dazhen Gu, Xifeng Lu, Ben Jamroz, Dylan Williams, Billy F. Riddle, Xiaohai Cui
We develop a new calibration technique for measuring the correction factor of a calorimeter with a vector network analyzer. Based on a wave-parameter formulation, we develop analytic formulas for the correction-factor ($g$) and effective-efficiency ($\eta$

Measuring Ion-Pairing in Buffer Solutions with Microwave Microfluidics

June 14, 2018
Author(s)
Angela C. Stelson, Charles A. Little, Nathan D. Orloff, Christian J. Long, James C. Booth
Microwave microfluidics is an emergent technique for characterizing conductivity and permittivity of fluids and has wide-ranging applications in the materials science and biomedical fields. The electrical properties of fluids as a function of frequency can

Generalized Sheet Transition Conditions (GSTCs) for a Metascreen

May 1, 2018
Author(s)
Christopher L. Holloway
Using the multiple-scales homogenization method, we derive generalized sheet transition conditions (GSTCs) for electromagnetic fields at the surface of a metascreen---a metasurface with a ``fishnet'' structure. These surfaces are characterized by
Displaying 151 - 175 of 3057