The QZabre is an all-in-one scanning quantum sensor solution. Each QZabre consists of a ceramic carrier chip, a tuning fork distance sensor, and a high-quality diamond tip with a single embedded NV center. We assemble these elements in a few standard configurations and will do our best to implement alternate configuration requests.
Single Crystalline Diamond Quantum Probe
The QZabre is equipped with a high quality nanofabricated diamond tip formed by a series of lithography and etching steps. Single nitrogen vacancy centers are introduced at ~10 nm from the apex by shallow ion implantation. High quality single crystalline diamond is used as the starting material to enable long intrinsic dephasing and coherence times. The tip shape is optimized to enable high photon count rates of well above 100 kC/s.
Convenient AFM Distance Sensor
The QZabre integrates a force-feedback sensor based on a quartz tuning fork. The force feedback allows for a safe approach of the surface and a controlled navigation of the probe over the sample using a standard atomic force microscopy (AFM) controller. The QZabre is available in two basic configurations: the tuning fork can be operated in either tapping or shear mode. A proprietary chip assembly technique is used to minimize the tip standoff and serves to achieve NV-to-surface separations below 50 nm.
Plug-and-Play Carrier Chip
For easy handling, the diamond probe tip and tuning fork sensor are assembled on a robust ceramic holder. A minimal holder thickness ensures that the sensor can be mounted in microscopes where vertical space is tight. The holder chip has two patterned feed lines for actuating the tuning fork.
Below is a typical chip assembly used by customers and in some of our own microscopes. Other configurations can include:
- Tuning fork mounted in tapping mode or shear mode
- Tuning fork mounted on opposite (upper or lower) sides of chip
- Operate chip at an angle
- Akiyama probe holder footprint (www.akiyamaprobe.com)
- Personalized footprint of the holder
Orientations and Cantilever
We currently offer two cantilever designs in “Up” or “Down” configuration. The gold contact pads are on the topside in these example images.
Specifications are subject to change as we continue to improve our probes.
|Tip material||Single crystal diamond, electronic grade|
|Tip end diameter||150-350 nm|
|Tip height||0.8-3 μm|
|Number of NV centers
|Orientation||N-V axis at a 54.7° angle to surface normal|
|Photon counts||>100 kC/s into a 0.7 NA objective|
|ODMR contrast||15-24 %|
||Approx. 10 nm|
|Dephasing time T2*
||Approx. 1 μs|
|Decoherence time T2
||A few μs to a few tens of μs|
|Sensor Type||Force feedback based on quartz tuning fork|
|Force feedback||Shear or tapping mode|
|Sensor frequency||Approx. 32 kHz|
|Tilt between chip and sensor surface||Standard is 0°. Other tilt angles on request|
|Vertical clearance||>0.5 mm for shear mode,
>1 mm for tapping mode1
1Contact us for improved clearance requests