Adiabatic-NOVEL for Nano-Scale Magnetic Resonance Imaging

TL;DR

This paper introduces adiabatic-NOVEL, a robust and efficient dynamic nuclear polarization technique designed for nano-scale MRI, improving sensitivity by mitigating field inhomogeneity effects.

Contribution

It presents a novel adiabatic version of NOVEL that enhances DNP efficiency and robustness in nano-MRI through specific pulse sequences and amplitude modulation.

Findings

Adiabatic-NOVEL significantly improves polarization transfer efficiency.

The method is robust against static and microwave field inhomogeneities.

Simulation results demonstrate enhanced sensitivity in nano-MRI applications.

Abstract

We propose a highly efficient dynamic nuclear polarization technique that is robust against field in-homogeneity. This technique is designed to enhance the detection sensitivity in nano-MRI, where large Rabi field gradients are required. The proposed technique consists of an adiabatic half passage pulse followed by an adiabatic linear sweep of the electron Rabi frequency and can be considered as an adiabatic version of nuclear orientation via electron spin locking (adiabatic-NOVEL). We analyze the spin dynamics of an electron-nuclear system that is under microwave irradiation at high static magnetic field and at cryogenic temperature. The result shows that an amplitude modulation of the microwave field makes adiabatic-NOVEL highly efficient and robust against both the static and microwave field in-homogeneity.