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Microresonator for the E P R experiments

Microresonator for the E P R experiments. R. Narkowicz. Outline. Concept of the microresonator Experimental and technoligical constraints Microcoil d esign and optimization Experimental verification of the design Next steps Conclusions. Concept of the microresonator.

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Microresonator for the E P R experiments

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  1. Microresonator for the EPR experiments R. Narkowicz

  2. Outline • Concept of the microresonator • Experimental and technoligical constraints • Microcoil design and optimization • Experimental verification of the design • Next steps • Conclusions

  3. Concept of the microresonator • Sensitivity of the resonator for small samples can be increased by minimizing its size and thus increasing the filling factor • Resonator built with discrete components has to be at least order of magnitude smaller than the operation wavelength • Experience with such a resonators in a field of NMR confirms that sensitivity varies inver-sely with linear dimensions of the elements

  4. Technological constraints • Planar elements are ideal to be manu-factured by means of standard micro-technology • Planar microcoil is well suited for the mono-layers of of N@C60 and can be desig-ned on the same Si substrate, on which fullerenes can be deposited • Si substrate would provide the heat sink required for the operation at high current densities in small size elements

  5. Microcoil design and optimization • main optimization criterion– signal-to-noise ratio • signal can be maximized byincreasing magnetic field • noise can be reduced by minimizing trace resistance

  6. optimization results

  7. 3D electrodynamic simulation – surface current

  8. 3D electrodynamic simulation – magnetic field distribution

  9. Tuning the microcoil with the shunt stub

  10. CW EPR of DPPH f=14GHz spectrometer sensitivity B-Field / mT

  11. ODMR of a single N-V defectin diamond

  12. Next steps • Smaller coils • Numerical modeling of skin- and proximity effects • New substrates with lower losses (glass) or better thermal conductivity (Si) • Coplanar waveguide as an alternative coupling system

  13. Conclusions • The sensitivity of the microcoil prototype is comparable with that of conventional cavity • The further miniaturization of the microcoil should made it superior to the waveguide cavity for the samples containing small number of spins

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