Broadband electron paramagnetic resonance spectrometer from 1 to 15 GHz using metallic coplanar waveguide

Area of Science:

• Spectroscopy
• Quantum Sensing
• Materials Science

Background:

• Electron Paramagnetic Resonance (EPR) spectroscopy is crucial for studying materials with unpaired electrons.
• Existing EPR systems often have limited frequency ranges, restricting their applicability.
• Broadband capabilities are needed for comprehensive material characterization.

Purpose of the Study:

• To develop and demonstrate a novel broadband Electron Paramagnetic Resonance (EPR) spectrometer.
• To enable continuous wave (CW) and pulsed EPR measurements across a wide frequency range.
• To assess the performance and sensitivity of the developed EPR system.

Main Methods:

• Utilized a broadband metallic coplanar waveguide as the probe.
• Designed a spectrometer operating continuously from 1 to 15 GHz.
• Tested system performance using 2,2-diphenyl-1-(2,4,6-trinitrophenyl)hydrazyl powder at room temperature.

Main Results:

• Achieved broadband operation from 1 to 15 GHz.
• Demonstrated capability for both continuous wave and pulsed EPR measurements.
• Measured a sensitivity of 3.3×10^12 spins/GaussHz at 13 GHz in CW mode.
• Obtained spin-lattice relaxation time via inversion recovery experiments in pulsed mode.

Conclusions:

• The developed broadband EPR spectrometer is a versatile tool for material characterization.
• The system demonstrates high sensitivity and capability for both CW and pulsed EPR.
• This technology advances EPR spectroscopy for a wider range of scientific applications.