Title

High-frequency microstrip cross resonators for circular polarization electron paramagnetic resonance spectroscopy

Authors

Authors

J. J. Henderson; C. M. Ramsey; H. M. Quddusi;E. del Barco

Comments

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Abbreviated Journal Title

Rev. Sci. Instrum.

Keywords

QUANTUM COMPUTATION; CYCLOTRON-RESONANCE; SPIN-RESONANCE; ABSORPTION; BISMUTH; Instruments & Instrumentation; Physics, Applied

Abstract

In this article we discuss the design and implementation of a novel microstrip resonator which allows absolute control of the microwaves polarization degree for frequencies up to 30 GHz. The sensor is composed of two half-wavelength microstrip line resonators, designed to match the 50 Omega impedance of the lines on a high dielectric constant GaAs substrate. The line resonators cross each other perpendicularly through their centers, forming a cross. Microstrip feed lines are coupled through small gaps to three arms of the cross to connect the resonator to the excitation ports. The control of the relative magnitude and phase between the two microwave stimuli at the input ports of each line allows for tuning the degree and type of polarization of the microwave excitation at the center of the cross resonator. The third (output) port is used to measure the transmitted signal, which is crucial to work at low temperatures, where reflections along lengthy coaxial lines mask the signal reflected by the resonator. Electron paramagnetic resonance spectra recorded at low temperature in an S=5/2 molecular magnet system show that 82% fidelity circular polarization of the microwaves is achieved over the central area of the resonator. (C) 2008 American Institute of Physics.

Journal Title

Review of Scientific Instruments

Volume

79

Issue/Number

7

Publication Date

1-1-2008

Document Type

Article

Language

English

First Page

4

WOS Identifier

WOS:000258179400043

ISSN

0034-6748

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