Broadband EPR in Microresonators

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EPR microresonators provide an enormous sensitivity boost for small samples. Another specific property of microresonators, compared to classical cavity resonators is their large bandwidth. This is an important asset for experiments that require short switching times of the exciting microwave field, fast modulation of amplitude, frequency or phase, or irradiation with multiple frequency components and / or short dead times. In the present project, will develop the experimental techniques that utilize this potential for the detection of broad lines and rapidly decaying signals. In addition, we will also develop related broadband techniques that further increase the overall sensitivity of microresonators by using concurrent data acquisition for all spins in the resonator bandwidth. This additional sensitivity boost also exploits the large bandwidth of microresonators and compensates the sensitivity reduction due to the low quality factor. The techniques developed in this project will be useful for many other projects in this priority programme that use microresonators for sensitive detection of signals from small samples.