Laser Beam Induced Charge Collection for Defect Mapping and Spin State Readout in Diamond
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2024-08-20 |
| Journal | Advanced Quantum Technologies |
| Authors | Dominic Reinhardt, Julia Heupel, Cyril Popov, Ralf Wunderlich |
| Institutions | University of Kassel, Leipzig University |
Abstract
Section titled āAbstractāAbstract The detection of laserāinduced photoācurrents in diamond is shown with about 100 fA resolution in the picoā to nanoampere range. A microāelectronic approach enables to work without using lockāin techniques. For that purpose, a commercially available and lowācost precision integrating amplifier is utilized on a homeābuilt printed circuit board. This technique is applied to three different diamond samples with different defect concentrations. Two ultraāpure diamond samples with shallow implanted defects, predominantly nitrogenāvacancy (NV) centers and substitutional nitrogen (P1 centers), are investigated. The third sample is an electronāirradiated type Ib diamond with a much higher intrinsic defect concentration. For all samples, spatially resolved photoācurrent maps as well as laser power and bias voltageādependent measurements are recorded. Furthermore, photoācurrents are successfully recorded without an applied bias voltage. Finally, the technique is used to perform continuous wave photoelectric detection of magnetic resonances (PDMR) using NV centers. The presented approach paves the way for timeāresolved photoācurrent measurements of individual defects and pulsed PDMR measurements without lockāin technology.