Chip-integrated large-B1 THz microwave sources for DNP (B03)

• Subject Area: Electronic Semiconductors, Components and Circuits, Integrated Systems, Sensor Technology, Theoretical Electrical Engineering
• Term: since 2022
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 454252029

Project B03 investigates new chip-integrated InGaAs B1 field sources for DNP-enhanced NMR experiments with frequencies up to 1 THz. In contrast to prior art, the proposed sources produce the required microwave/THz B1 field in the near field of the inductor of a voltage-controlled oscilla-tor (VCO). This ensures both a high conversion efficiency (from DC power to B1 field strength) and frequency agility. Moreover, the proposed approach makes use of electrically large inductors that consist of several smaller slab inductors, which are driven by currents with the appropriate phases. The individual VCO-based B1 source elements will be embedded into large-scale arrays for en-hanced sensitive volumes and phase-locked loops (PLLs) for external phase control. Project B03 direct caters to the CRC’s overarching goal of NMR sensitivity enhancement. The lab prototypes of this project will be used in several other CRC projects (e. g. A03, B01, B02, B05, B06). Project B03 will receive critical input from project C01 in the form of customly optimized pulse sequences.

• DFG Programme: Collaborative Research Centres
• Subproject of: SFB 1527: High Performance Compact Magnetic Resonance – HyPERiON
• Applicant Institution: Karlsruher Institut für Technologie
• Project Head: Professor Dr. Jens Anders