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Updated: Jun 12, 2025
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Published on: September 26, 2016
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Design and Implementation of Integrated Dual-Mode Pulse and Continuous-Wave Electron Paramagnetic Resonance
IEEE Transactions on Biomedical Circuits and Systems
|September 20, 2024
Summary
This study introduces the first integrated on-chip pulse Electron Paramagnetic Resonance (EPR) spectrometer. This portable, low-power device enables sensitive detection of radicals for diverse applications.
Area of Science:
- Spectroscopy
- Electronics
- Chemistry
Background:
- Electron Paramagnetic Resonance (EPR) detects radicals with unpaired electrons.
- Portable EPR systems can expand applications in diagnostics and basic science.
- Existing EPR methods include continuous-wave (CW) and pulse EPR.
Purpose of the Study:
- To develop the first fully integrated, on-chip pulse EPR spectrometer.
- To demonstrate a portable, low-power EPR sensing modality.
- To validate the device's performance for both CW and pulse EPR experiments.
Main Methods:
- Designed a subharmonic direct-conversion architecture for an on-chip EPR spectrometer.
- Utilized an on-chip oscillator as a dual-mode sensing cell for CW and pulse EPR.
- Employed an on-chip reference oscillator for pulse generation and signal downconversion.
Main Results:
- Achieved pulse sensitivity of spins (1000 averages) and CW sensitivity of spins/.
- Demonstrated low power consumption as low as 2.1mW (CW mode).
- System is tunable from 12.8-14.9GHz and controlled via USB.
Conclusions:
- The integrated on-chip spectrometer is viable for portable EPR sensing.
- The device supports various pulse EPR sequences (FID, inversion recovery, Hahn echo, stimulated echo) and CW operation.
- This technology has potential for point-of-care diagnostics and broader scientific use.
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