Microstrip resonators for electron paramagnetic resonance experiments

Author(s)

Torrezan, A. C. ^{[1, 2]} ; Alegre, T. P. Mayer ^{[3, 1]} ; Medeiros-Ribeiro, G. ^[1]

Affiliation

^[1] Lab Nacl Luz Sincrotron, BR-13084971 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Fac Engn Eletr & Comp, BR-13083970 Campinas, SP - Brazil

^[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil

• Document type: Journal article
• Source: Review of Scientific Instruments; v. 80, n. 7 JUL 2009.
• Web of Science Citations: 11

Abstract

In this article we evaluate the performance of an electron paramagnetic resonance (EPR) setup using a microstrip resonator (MR). The design and characterization of the resonator are described and parameters of importance to EPR and spin manipulation are examined, including cavity quality factor, filling factor, and microwave magnetic field in the sample region. Simulated microwave electric and magnetic field distributions in the resonator are also presented and compared with qualitative measurements of the field distribution obtained by a perturbation technique. Based on EPR experiments carried out with a standard marker at room temperature and a MR resonating at 8.17 GHz, the minimum detectable number of spins was found to be 5x10(10) spins/GHz(1/2) despite the low MR unloaded quality factor Q(0)=60. The functionality of the EPR setup was further evaluated at low temperature, where the spin resonance of Cr dopants present in a GaAs wafer was detected at 2.3 K. The design and characterization of a more versatile MR targeting an improved EPR sensitivity and featuring an integrated biasing circuit for the study of samples that require an electrical contact are also discussed. (AU)

• FAPESP's process: 04/01228-6 - Unitary operations on a qubit
• Grantee: Thiago Pedro Mayer Alegre
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)