In the newly started project KoSenDi (Compact Sensor Unit for the Measurement of Magnetic Fields by Diamond Fluorescence), the scientists of the CiS Research Institute deal with the miniaturization of a magnetic field sensor based on sticksoff defects (NV centers) in diamond. The goal is to build a sensor stack consisting of a partially transparent silicon detector, a long-pass filter and a silicon volume detector. The sensor stack shall detect the fluorescence of the NV centers in the diamond (volume detector) as well as the intensity of the excitation wavelength. The sensor unit is surrounded by a pair of Helmholz coils, which keeps the magnetic field in the sensor constant. Depending on the strength of the external magnetic field (to be measured), the coil current is readjusted and allows conclusions to be drawn about the strength of the field to be measured (compensation method). In the project, photodiodes with filters specially adapted to diamond fluorescence are designed and manufactured. A further focus of the work is the assembly and connection technology of the compact stack structure.
The research and development work described was funded by the German Federal Ministry of Economic Affairs and Climate Action (BMWK) in the research project “Compact sensor unit for measuring magnetic fields using diamond fluorescence (KoSenDi)”.
Funding code: 49MF220192
